{"id":725,"date":"2026-05-27T08:08:43","date_gmt":"2026-05-27T08:08:43","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=725"},"modified":"2026-05-27T08:08:43","modified_gmt":"2026-05-27T08:08:43","slug":"korean-orchard-stone-clearing-thor-ep-ew-4000-guide","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/hi\/korean-orchard-stone-clearing-thor-ep-ew-4000-guide\/","title":{"rendered":"\u0915\u094b\u0930\u093f\u092f\u093e\u0908 \u092c\u093e\u0917\u094b\u0902 \u092e\u0947\u0902 \u092a\u0924\u094d\u0925\u0930 \u0939\u091f\u093e\u0928\u0947 \u0915\u093e \u0915\u093e\u092e \u2014 \u0938\u0947\u092c, \u0928\u093e\u0936\u092a\u093e\u0924\u0940 \u0914\u0930 \u0916\u091c\u0942\u0930 \u0915\u0947 \u0916\u0947\u0924\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f THOR 2.4 \u0914\u0930 EP-EW-4000"},"content":{"rendered":"<div style=\"font-family: Georgia,'Times New Roman',serif; font-size: clamp(14px,2vw+10px,18px); color: #333; line-height: 1.8; word-break: break-word; overflow-wrap: break-word; max-width: 100%; box-sizing: border-box;\">\n<p><!-- HERO --><\/p>\n<div style=\"position: relative; background-image: url('https:\/\/rock-crusher-tractor.com\/wp-content\/uploads\/2025\/11\/THOR-3.0-Rock-Crusher-application-1.webp'); background-size: cover; background-position: center 38%; min-height: 490px; display: flex; align-items: center; justify-content: center; text-align: center; padding: 80px 20px; margin-bottom: 48px; border-radius: 6px; overflow: hidden;\">\n<div style=\"position: absolute; inset: 0; background: linear-gradient(to bottom,rgba(0,0,0,0.46) 0%,rgba(0,0,0,0.76) 100%);\"><\/div>\n<div style=\"position: relative; z-index: 1; max-width: 760px; color: #fff;\">\n<h1 style=\"font-size: clamp(22px,3.8vw+10px,44px); font-weight: bold; color: #fff; line-height: 1.2; margin: 0 0 20px 0; text-shadow: 0 2px 8px rgba(0,0,0,0.55);\">Korean Orchard Stone Clearing \u2014 THOR 2.4 and EP-EW-4000 for Apple, Pear, and Persimmon Farm Establishment and Annual Maintenance<\/h1>\n<p style=\"font-size: clamp(14px,1.8vw+9px,18px); color: rgba(255,255,255,0.9); margin: 0 0 28px 0; line-height: 1.6; max-width: 640px; margin-left: auto; margin-right: auto;\">Once the orchard is planted, you cannot go back. Korean perennial fruit trees commit to the same granite soil for 20\u201330 years. Pre-planting stone clearance determines every harvest season that follows.<\/p>\n<p><a style=\"display: inline-block; background: #f07c00; color: #fff; padding: 14px 38px; border-radius: 4px; text-decoration: none; font-weight: bold; font-size: clamp(13px,1.5vw+9px,16px); letter-spacing: .02em; box-shadow: 0 4px 14px rgba(0,0,0,0.4);\" href=\"https:\/\/rock-crusher-tractor.com\/hi\/contact-us\/\">Orchard Stone Clearing Consultation<\/a><\/p>\n<\/div>\n<\/div>\n<p><!-- INTRO --><\/p>\n<p>Korean highland and mountainside fruit orchards \u2014 apple, pear, and persimmon \u2014 share the granite terrain of Gangwon-do, North Gyeongsang, and other highland production zones with the potato and vegetable operations covered elsewhere in this series. But orchard stone management follows a fundamentally different logic from annual crop stone management, because the investment horizon is completely different: a Korean apple orchard planted today will still be producing in 2045. The stone clearing decisions made before the first tree is planted determine the operational environment for the entire productive life of those trees.<\/p>\n<p>This article covers the complete orchard stone management programme \u2014 from the pre-planting establishment clearance that determines long-term root development quality, through the annual alley maintenance system that protects harvest equipment and workforce safety across the orchard&#8217;s productive life. The <a style=\"color: #f07c00; text-decoration: none; font-weight: bold;\" href=\"https:\/\/rock-crusher-tractor.com\/hi\/product\/thor-2-4-rock-crusher-with-kit-drawbar-180-hp-stone-crusher-mulcher-for-tractor\/\">\u0925\u094b\u0930 2.4 \u0938\u094d\u091f\u094b\u0928 \u0915\u094d\u0930\u0936\u0930<\/a> \u0914\u0930 \u092f\u0939 <a style=\"color: #f07c00; text-decoration: none; font-weight: bold;\" href=\"https:\/\/rock-crusher-tractor.com\/hi\/product\/ep-ew-4000-rock-rake-3-6m-tractor-75hp\/\">EP-EW-4000 rock picker<\/a>\u00a0serve entirely different phases of this programme \u2014 and confusing the two produces either under-investment before planting or over-deployment during maintenance.<\/p>\n<p><!-- SECTION: WHY ORCHARDS HAVE DIFFERENT STONE LOGIC --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Why Orchard Stone Management Differs from Annual Crop Management<\/h2>\n<p><img decoding=\"async\" style=\"width: 100%; height: auto; display: block; border-radius: 6px; margin: 20px 0 28px 0;\" title=\"THOR 2.4 \u2014 Orchard Pre-Planting Establishment Clearance\" src=\"https:\/\/rock-crusher-tractor.com\/wp-content\/uploads\/2025\/11\/THOR-2.4-Rock-Crusher-with-Kit-Drawbar-application-1.webp\" alt=\"THOR 2.4 stone crusher clearing orchard establishment site \u2014 pre-planting clearance is a one-time opportunity that determines root development quality for the orchard's full productive life\" \/><\/p>\n<p>Annual crops like potato and radish give the farmer a fresh start every season \u2014 if stone management was inadequate one year, the damage (poor grade, machine repair) is painful but bounded, and next year&#8217;s clearance can correct the soil condition before replanting. Perennial orchards offer no such reset. The logical differences are stark:<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 14px; margin: 14px 0 28px 0;\">\n<div style=\"flex: 1 1 220px; background: #fff0f0; border: 1px solid #f0c0c0; border-top: 5px solid #cc3333; padding: 16px 18px; border-radius: 0 0 6px 6px; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #cc3333; margin: 0 0 8px 0;\">Annual crop: one-season consequence<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Inadequate stone clearing before potato planting produces poor grade and machine damage in that single season. The field is cleared again the following March and replanted \u2014 the consequence is one season&#8217;s degraded revenue. Painful but recoverable.<\/p>\n<\/div>\n<div style=\"flex: 1 1 220px; background: #fff0f0; border: 1px solid #f0c0c0; border-top: 5px solid #cc3333; padding: 16px 18px; border-radius: 0 0 6px 6px; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #cc3333; margin: 0 0 8px 0;\">Perennial orchard: 20-year consequence<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Inadequate stone clearing before apple or pear planting leaves embedded stones in the root development zone where the tree&#8217;s anchor roots will grow for the next 20\u201330 years. Root deflection around embedded stones produces structurally weaker root systems that are more susceptible to wind throw. Stones in the access alley damage harvest equipment, spray machine wheels, and harvest worker feet \u2014 every year, for the orchard&#8217;s entire life. This is not recoverable by next season&#8217;s clearance. The trees are in the ground.<\/p>\n<\/div>\n<\/div>\n<p>The pre-planting window \u2014 the single opportunity before trees go into the ground \u2014 demands the most thorough stone clearance standard the THOR 2.4 system can provide. After planting, the clearance standard shifts to the operational maintenance level that protects equipment and personnel in the established alley system. The investment profile mirrors this logic: intensive and comprehensive before planting, systematic and consistent after planting.<\/p>\n<p><!-- SECTION: THREE KOREAN ORCHARD FRUIT TYPES --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Three Korean Orchard Crops \u2014 Stone Sensitivity and Production Zone by Species<\/h2>\n<p>Korea&#8217;s three main highland orchard crops \u2014 apple, pear, and persimmon \u2014 have different stone sensitivity profiles that affect the pre-planting clearance standard required:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 10px; margin: 14px 0 28px 0;\">\n<div style=\"background: #fff; border: 1px solid #e0e0e0; border-left: 6px solid #f07c00; padding: 16px 18px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #f07c00; font-size: clamp(14px,1.5vw+9px,16px); margin: 0 0 8px 0;\">Korean Apple \u2014 Heaviest Root Penetration, Highest THOR Standard<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Korean apple production is concentrated in North Gyeongsang (Andong, Cheongdo, Gunwi), Gangwon-do highland, and southern highland zones \u2014 all on granite or granite-derived soils. Apple rootstocks (primarily Malling series semi-dwarfing rootstocks in Korean commercial orchards) develop a moderately deep but laterally extensive root system that reaches 40\u201360 cm depth in the granite soil profile. Stones above 5 cm in this root zone cause root deflection that affects anchor root development and water uptake efficiency. Pre-planting THOR 2.4 clearance to 35 cm depth, with fine fragmentation (hood closed) and thorough CT-2100 collection, is the minimum standard for Korean apple orchard establishment on granite sites.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e0e0e0; border-left: 6px solid #2d5f2d; padding: 16px 18px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #2d5f2d; font-size: clamp(14px,1.5vw+9px,16px); margin: 0 0 8px 0;\">Korean Pear \u2014 Deeper Taproot, Same Clearance Standard<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Korean pear production is concentrated in Naju (South Jeolla), Sangju and Cheongsong (North Gyeongsang), and scattered highland zones where granite soil profile applies. Pear rootstocks (typically Pyrus pyrifolia seedling stocks in Korean production) develop a stronger, deeper taproot than apple \u2014 reaching 50\u201370 cm depth on well-prepared sites. This deeper root development makes the clearance depth requirement for pear orchards the most demanding of the three Korean orchard species: THOR 2.4 at maximum depth (30\u201332 cm) plus PSW-3200 subsoil loosening before planting is the recommended combination for premium pear establishment on shallow granite sites where natural soil depth is limiting.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e0e0e0; border-left: 6px solid #1565c0; padding: 16px 18px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #1565c0; font-size: clamp(14px,1.5vw+9px,16px); margin: 0 0 8px 0;\">Korean Persimmon \u2014 Shallower Root System, Moderate Standard<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Korean persimmon (primarily Diospyros kaki varieties) is concentrated in Gyeongsang provinces and southern highland zones on moderately deep to shallow soils. Persimmon root systems are shallower and less aggressive than apple or pear \u2014 developing primarily in the 0\u201340 cm zone on most Korean granite sites. Pre-planting clearance to 25\u201330 cm using the THOR 2.4 (one full-depth pass with CT-2100 collection) is typically adequate for persimmon establishment. Annual alley maintenance with the EP-EW-4000 is the same as for apple and pear once established.<\/p>\n<\/div>\n<\/div>\n<p><!-- SECTION: PRE-PLANTING ESTABLISHMENT PROTOCOL --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Pre-Planting Establishment Protocol \u2014 The One-Time Investment Before Trees Go In<\/h2>\n<p><img decoding=\"async\" style=\"width: 100%; height: auto; display: block; border-radius: 6px; margin: 20px 0 28px 0;\" title=\"EP-EW-4000 \u2014 Orchard Establishment Final Surface Sweep\" src=\"https:\/\/rock-crusher-tractor.com\/wp-content\/uploads\/2026\/05\/Roke-Rake-Application.webp\" alt=\"EP-EW-4000 rock rake \u2014 used for final surface sweep after THOR 2.4 pre-planting clearance pass on Korean orchard establishment sites\" \/><\/p>\n<p>The pre-planting stone clearance protocol for Korean orchard establishment follows a specific sequence designed to achieve the deepest and most thorough clearance possible before the irreversible planting commitment. The sequence applies to new orchard establishment on previously uncultivated land and to replanting after old orchard removal:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 0; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden; margin: 14px 0 28px 0;\">\n<div style=\"display: flex; flex-wrap: wrap; padding: 12px 16px; background: #f8f8f8; gap: 10px; border-bottom: 1px solid #e0e0e0; align-items: flex-start;\">\n<div style=\"flex: 0 0 auto; background: #f07c00; color: #fff; font-size: clamp(10px,1vw+7px,11px); font-weight: bold; padding: 3px 12px; border-radius: 20px;\">Step 1 \u2014 Autumn before planting year<\/div>\n<p style=\"flex: 1 1 200px; margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">THOR 2.4 first pass at full working depth (30 cm), hood more open (coarser fragmentation acceptable for first pass). This pass targets the large embedded stones. CT-2100 collection following. Lime application and PSW-3200 incorporation to begin pH correction to the orchard-specific pH target (apple\/pear: 6.0\u20136.5; persimmon: 5.8\u20136.5). Soil test submission.<\/p>\n<\/div>\n<div style=\"display: flex; flex-wrap: wrap; padding: 12px 16px; background: #fff; gap: 10px; border-bottom: 1px solid #e0e0e0; align-items: flex-start;\">\n<div style=\"flex: 0 0 auto; background: #f07c00; color: #fff; font-size: clamp(10px,1vw+7px,11px); font-weight: bold; padding: 3px 12px; border-radius: 20px;\">Step 2 \u2014 Spring before planting (March)<\/div>\n<p style=\"flex: 1 1 200px; margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">THOR 2.4 second pass at full depth, hood fully closed (finest fragmentation). CT-2100 collection. EP-EW-4000 surface sweep to remove all post-crusher fragments and frost-heave stones from the preceding winter. The EP-EW-4000 surface pass reveals any missed deeper stones that the THOR has brought to the surface \u2014 a useful diagnostic pass before final planting site confirmation.<\/p>\n<\/div>\n<div style=\"display: flex; flex-wrap: wrap; padding: 12px 16px; background: #f8f8f8; gap: 10px; border-bottom: 1px solid #e0e0e0; align-items: flex-start;\">\n<div style=\"flex: 0 0 auto; background: #2d5f2d; color: #fff; font-size: clamp(10px,1vw+7px,11px); font-weight: bold; padding: 3px 12px; border-radius: 20px;\">Step 3 \u2014 4 weeks before planting<\/div>\n<p style=\"flex: 1 1 200px; margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">PSW-3200 tillage at 25 cm depth to produce the fine seedbed tilth needed for rootball contact. Sub-soil loosening at planting hole positions if soil depth is limiting. Final visual walk \u2014 hand-remove any stone above 5 cm visible at surface in the planned tree-row positions. Mark planting positions confirmed stone-free.<\/p>\n<\/div>\n<div style=\"display: flex; flex-wrap: wrap; padding: 12px 16px; background: #f0fff0; gap: 10px; border-top: 2px solid #2d5f2d; align-items: flex-start;\">\n<div style=\"flex: 0 0 auto; background: #2d5f2d; color: #fff; font-size: clamp(10px,1vw+7px,11px); font-weight: bold; padding: 3px 12px; border-radius: 20px;\">\u0930\u094b\u092a\u0923<\/div>\n<p style=\"flex: 1 1 200px; margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px); font-weight: bold;\">Trees planted. From this point forward, stones in the tree row cannot be removed without disturbing the root system. Annual alley management (EP-EW-4000 + CT-2100) manages the accessible alley surface only. The root zone clearance quality from Steps 1\u20133 is permanent.<\/p>\n<\/div>\n<\/div>\n<p><!-- SECTION: ANNUAL ALLEY MAINTENANCE --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Annual Alley Maintenance \u2014 EP-EW-4000 as the Orchard&#8217;s Working Partner<\/h2>\n<p><img decoding=\"async\" style=\"width: 100%; height: auto; display: block; border-radius: 6px; margin: 20px 0 28px 0;\" title=\"CT-2100 \u2014 Orchard Alley Annual Collection\" src=\"https:\/\/rock-crusher-tractor.com\/wp-content\/uploads\/2025\/11\/CT-2100-Rock-Picker-application-1.webp\" alt=\"CT-2100 rock picker following EP-EW-4000 in Korean orchard alley \u2014 annual surface collection protects harvest equipment and spray machine tyres from stone damage\" \/><\/p>\n<p>Once the orchard is established, the annual stone management programme shifts entirely to the EP-EW-4000 rock rake for surface alley collection. The THOR 2.4 is not typically redeployed in an established orchard \u2014 the trees in the rows prevent the THOR from operating at full width, and the already-cleared root zone does not require re-crushing unless there has been a severe frost heave event that has brought new large stones from below the initial clearance depth.<\/p>\n<p>The EP-EW-4000&#8217;s annual alley maintenance programme for Korean orchards follows a specific operational pattern:<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 12px; margin: 14px 0 28px 0;\">\n<div style=\"flex: 1 1 200px; background: #f0fff0; border: 1px solid #c0d8c0; border-left: 4px solid #2d5f2d; padding: 14px 16px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #2d5f2d; margin: 0 0 6px 0;\">Timing: late March (before any machinery enters alley)<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">The annual stone management pass must be the first field operation of the season \u2014 before spray tractors, before mulch mowers, before any equipment that could suffer stone damage. A stone-free alley at the beginning of the spray and management season protects every subsequent tractor pass until the end of harvest in October or November.<\/p>\n<\/div>\n<div style=\"flex: 1 1 200px; background: #f0fff0; border: 1px solid #c0d8c0; border-left: 4px solid #2d5f2d; padding: 14px 16px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #2d5f2d; margin: 0 0 6px 0;\">Width management: EP-EW-4000 partial pass<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Korean orchard alleys are typically 3.0\u20134.5 m wide \u2014 narrower than the EP-EW-4000&#8217;s 3.6 m working width on some older or traditional orchards with tighter tree spacing. For alleys narrower than 3.6 m, the EP-EW-4000 must be offset slightly to avoid contacting the tree trunks. On modern Korean orchards planted at 4.0\u20134.5 m alley spacing, a single centred EP-EW-4000 pass covers the full alley width in one pass.<\/p>\n<\/div>\n<div style=\"flex: 1 1 200px; background: #f0fff0; border: 1px solid #c0d8c0; border-left: 4px solid #2d5f2d; padding: 14px 16px; border-radius: 0 6px 6px 0; box-sizing: border-box;\">\n<p style=\"font-weight: bold; color: #2d5f2d; margin: 0 0 6px 0;\">Post-harvest second pass: optional but valuable<\/p>\n<p style=\"margin: 0; color: #555; font-size: clamp(12px,1.3vw+8px,14px);\">Korean apple and pear harvest (October\u2013November) is the most intensive period of machinery and labour traffic in the orchard alley. Post-harvest stone assessment \u2014 a walk of each alley after the harvest season ends \u2014 identifies any new stone emergence from harvest machinery disturbance. An October\u2013November EP-EW-4000 pass on sections where new stones are found reduces the accumulation that the following March pass must address.<\/p>\n<\/div>\n<\/div>\n<p><!-- SECTION: HARVEST EQUIPMENT DAMAGE COST --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">The Real Cost of Orchard Alley Stones \u2014 Harvest Equipment and Workforce<\/h2>\n<p>The economic argument for annual EP-EW-4000 orchard alley maintenance is different from the argument for pre-planting THOR clearance. Pre-planting clearance is about root development quality over the orchard&#8217;s life. Annual alley maintenance is about the direct operational cost of stone-related equipment and workforce incidents during the active harvest period. Three specific cost categories accumulate in unmanaged Korean orchard alleys:<\/p>\n<div style=\"overflow-x: auto; margin: 14px 0 28px 0;\">\n<table style=\"width: 100%; border-collapse: collapse; font-size: clamp(12px,1.3vw+8px,14px); min-width: 460px;\">\n<thead>\n<tr style=\"background: #1a1a1a; color: #fff;\">\n<th style=\"padding: 9px 12px; text-align: left; border-right: 1px solid #333;\">Damage category<\/th>\n<th style=\"padding: 9px 12px; text-align: left; border-right: 1px solid #333;\">Mechanism<\/th>\n<th style=\"padding: 9px 12px; text-align: left;\">Consequence<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee; font-weight: bold;\">Tractor and spray machine tyres<\/td>\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee;\">Pointed or angular stones above 5 cm on alley surface penetrate agricultural tyre sidewalls during slow spray passes<\/td>\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee;\">Tyre replacement cost + spray pass interruption during narrow pest control window<\/td>\n<\/tr>\n<tr style=\"background: #f8f8f8;\">\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee; font-weight: bold;\">Harvest platform and picker tyres<\/td>\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee;\">Self-propelled or tractor-towed harvest platforms operating at slow speed over uneven stone surface in October conditions<\/td>\n<td style=\"padding: 8px 12px; border-bottom: 1px solid #eee;\">Platform tyres are more expensive than agricultural tyres; puncture during harvest is disproportionately disruptive<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 8px 12px; font-weight: bold;\">Seasonal harvest worker foot injuries<\/td>\n<td style=\"padding: 8px 12px;\">Workers carrying loaded harvest crates on uneven, stone-littered alley surfaces in declining autumn light conditions<\/td>\n<td style=\"padding: 8px 12px;\">Ankle sprains and falls; worker compensation liability; workforce reluctance to return following season<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Annual EP-EW-4000 alley clearance (one half-day per 2\u20133 ha of orchard area) eliminates or dramatically reduces all three cost categories. The EP-EW-4000 operating cost per hectare of orchard alley on a single annual pass is typically a fraction of the average annual tyre replacement and injury management cost on comparable un-maintained Korean orchard operations.<\/p>\n<p><!-- SECTION: SLOPE AND KIT DRAWBAR --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Korean Mountain Orchard Terraces \u2014 Slope Clearance and Kit Drawbar Considerations<\/h2>\n<p><img decoding=\"async\" style=\"width: 100%; height: auto; display: block; border-radius: 6px; margin: 20px 0 28px 0;\" title=\"PSW-3200 \u2014 Orchard Establishment Seedbed After THOR Clearance\" src=\"https:\/\/rock-crusher-tractor.com\/wp-content\/uploads\/2025\/11\/PSW-3200-Rotavator-1.webp\" alt=\"Korean highland terrace orchard \u2014 PSW-3200 tillage after pre-planting THOR clearance, preparing the seedbed for orchard tree planting on terraced mountain sites\" \/><\/p>\n<p>Korean orchard production is not confined to flat valley floors \u2014 Korean apples and persimmons are extensively planted on mountainside terraces at 10\u201335% slope gradients, particularly in Gyeongbuk and Gangwon-do highland areas. Stone management on these terraced orchard sites follows the same slope safety principles as highland agricultural field operations: the THOR 2.4 Kit Drawbar pull-mode is mandatory for slope sections above 12%, and the EP-EW-4000 in annual maintenance mode requires slope assessment before entry.<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 8px; margin: 14px 0 28px 0;\">\n<div style=\"display: flex; gap: 12px; background: #fff9f3; border-left: 4px solid #f07c00; padding: 12px 16px; border-radius: 0 6px 6px 0; box-sizing: border-box; font-size: clamp(12px,1.3vw+8px,14px);\">\n<p><span style=\"color: #f07c00; flex-shrink: 0; font-weight: bold; margin-top: 2px;\">Slope pre-planting:<\/span><\/p>\n<p style=\"margin: 0; color: #555;\">THOR 2.4 in Kit Drawbar pull-mode for all terraces above 12% gradient. Working direction: up-and-down the slope (not across the face) to minimise lateral stability risk. Pre-planting slope clearance on steep orchard terraces may require multiple THOR passes at 45\u00b0 offset to fully cover the terrace surface \u2014 confirm with Korea Watanabe for site-specific slope angle and terrace width configuration.<\/p>\n<\/div>\n<div style=\"display: flex; gap: 12px; background: #fff9f3; border-left: 4px solid #f07c00; padding: 12px 16px; border-radius: 0 6px 6px 0; box-sizing: border-box; font-size: clamp(12px,1.3vw+8px,14px);\">\n<p><span style=\"color: #f07c00; flex-shrink: 0; font-weight: bold; margin-top: 2px;\">Slope annual maintenance:<\/span><\/p>\n<p style=\"margin: 0; color: #555;\">EP-EW-4000 on slope terraces follows the same 15% maximum gradient guideline as field operation. For steeper terrace alleys where the EP-EW-4000 cannot safely operate, manual stone removal or a smaller implement is required. On terraces at 12\u201315%, the EP-EW-4000 can operate safely with a loaded experienced operator \u2014 confirm tractor side-slope stability before commencing on gradients approaching this threshold.<\/p>\n<\/div>\n<\/div>\n<p><!-- SECTION: RENOVATION CLEARANCE --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">Orchard Renovation \u2014 Stone Clearing When Replanting After Old Tree Removal<\/h2>\n<p>Korean orchard renovation \u2014 removing ageing, low-productivity trees and replanting with new rootstocks and modern varieties \u2014 is a growing practice as the 1990s-era orchard stock reaches the end of its productive life. Renovation clearance has additional stone management complications compared to new establishment on previously uncultivated land:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 6px; margin: 14px 0 24px 0; font-size: clamp(12px,1.3vw+8px,14px);\">\n<div style=\"display: flex; gap: 10px; background: #f8f8f8; border-radius: 4px; padding: 9px 14px; box-sizing: border-box;\">\n<p><span style=\"color: #f07c00; flex-shrink: 0; font-weight: bold;\">Challenge 1:<\/span><\/p>\n<p style=\"margin: 0; color: #555;\"><strong>Old root mass in the soil.<\/strong> After old apple or pear tree removal, the major anchor and lateral root systems remain embedded in the granite soil at 20\u201360 cm depth. These woody roots partially obstruct the THOR 2.4 at renovation clearance depth \u2014 the THOR FLM (forestry model with CVT) is the correct machine for orchard renovation sites with significant woody root mass, while the agricultural THOR 2.4 is appropriate when root mass has been allowed to decompose (2+ years after tree removal) before the clearance pass.<\/p>\n<\/div>\n<div style=\"display: flex; gap: 10px; background: #fff; border-radius: 4px; padding: 9px 14px; box-sizing: border-box;\">\n<p><span style=\"color: #f07c00; flex-shrink: 0; font-weight: bold;\">Challenge 2:<\/span><\/p>\n<p style=\"margin: 0; color: #555;\"><strong>Replant disease.<\/strong> Korean orchard soils supporting apple trees for 20+ years accumulate Pratylenchus root lesion nematodes and Pythium species that cause apple replant disease when new trees are planted into the same soil. Stone clearing alone does not address replant disease \u2014 soil treatment with biofumigants (Brassica green manure incorporation) or targeted soil fumigation is needed in addition to stone clearance for apple renovation sites with replant disease history.<\/p>\n<\/div>\n<div style=\"display: flex; gap: 10px; background: #f8f8f8; border-radius: 4px; padding: 9px 14px; box-sizing: border-box;\">\n<p><span style=\"color: #f07c00; flex-shrink: 0; font-weight: bold;\">Challenge 3:<\/span><\/p>\n<p style=\"margin: 0; color: #555;\"><strong>Compacted wheel tracks.<\/strong> Decades of orchard tractor traffic in fixed alley positions creates deep compaction in the tractor wheel tracks that the PSW-3200 must break up before replanting. A PSW-3200 deep tillage pass (30 cm, 1000 RPM) after the THOR 2.4 clearance and before replanting ensures the new rootball does not encounter the old compaction zone in its first years of establishment growth.<\/p>\n<\/div>\n<\/div>\n<p><!-- FAQ --><\/p>\n<h2 style=\"font-size: clamp(20px,2.8vw+10px,30px); color: #1a1a1a; border-left: 5px solid #f07c00; padding-left: 16px; margin: 48px 0 20px 0; line-height: 1.3;\">\u0905\u0915\u094d\u0938\u0930 \u092a\u0942\u091b\u0947 \u091c\u093e\u0928\u0947 \u0935\u093e\u0932\u0947 \u092a\u094d\u0930\u0936\u094d\u0928\u094b\u0902<\/h2>\n<div style=\"display: flex; flex-direction: column; gap: 0;\">\n<details style=\"border-bottom: 1px solid #e5e5e5; padding: 16px 0;\">\n<summary style=\"font-weight: bold; color: #1a1a1a; cursor: pointer; font-size: clamp(14px,1.6vw+8px,16px);\">How deep should pre-planting stone clearance go for Korean apple orchards?<\/summary>\n<p style=\"margin: 12px 0 0 0; color: #555;\">For Korean apple orchards planted on Malling semi-dwarfing rootstocks (M.9, M.26, or M.7 \u2014 the most common in Korean commercial orchards), the practical root development zone extends to 40\u201350 cm depth on well-prepared sites. The THOR 2.4 operating at maximum depth (30\u201332 cm) with hood fully closed achieves fragmentation coverage through the critical upper root development zone. An additional PSW-3200 subsoil loosening pass at 30 cm depth without full inversion after the THOR clearance extends the physical soil loosening (if not the stone-free zone) to 55\u201360 cm by fracturing the compaction transition below the THOR zone. For vigorous rootstocks (M.7 and above) where root development regularly exceeds 60 cm, the two-pass THOR protocol (autumn at 28 cm + spring at 30\u201332 cm) provides the most thorough stone fragmentation coverage within the THOR 2.4&#8217;s operating range before the rootball penetrates below the achievable clearance depth. Contact Korea Watanabe to confirm the optimal two-pass protocol for your specific site soil depth and stone layer distribution.<\/p>\n<\/details>\n<details style=\"border-bottom: 1px solid #e5e5e5; padding: 16px 0;\">\n<summary style=\"font-weight: bold; color: #1a1a1a; cursor: pointer; font-size: clamp(14px,1.6vw+8px,16px);\">Can the EP-EW-4000 operate between established orchard trees without causing root damage?<\/summary>\n<p style=\"margin: 12px 0 0 0; color: #555;\">Yes \u2014 in the alley between tree rows, the EP-EW-4000 operates on the alley surface and does not penetrate into the tree row. The risk of root damage from the EP-EW-4000 is limited to the tine drum&#8217;s 5\u201310 cm surface penetration depth, which is well above the main lateral root system of established trees (which develops at 15\u201360 cm depth). The EP-EW-4000&#8217;s operation in the orchard alley is analogous to grass mowing \u2014 it disturbs the surface layer but not the root system below. The only scenario where EP-EW-4000 tines could damage surface roots is in very shallow-soiled orchards where feeder roots have grown up into the surface 5 cm layer under the permanent grass cover \u2014 detectable by visible surface root exposure in the alley. On these sites, raise the EP-EW-4000 tine height slightly above normal field setting to avoid tine contact with the surface root layer.<\/p>\n<\/details>\n<details style=\"border-bottom: 1px solid #e5e5e5; padding: 16px 0;\">\n<summary style=\"font-weight: bold; color: #1a1a1a; cursor: pointer; font-size: clamp(14px,1.6vw+8px,16px);\">Is a permanent grass cover alley compatible with the EP-EW-4000 stone collection pass?<\/summary>\n<p style=\"margin: 12px 0 0 0; color: #555;\">Korean apple and pear orchards commonly use permanent sward alleys (grass cover maintained by mowing rather than cultivation) that provide soil stability and reduce erosion on sloped sites. The EP-EW-4000 can collect surface stones from permanent grass alleys with the tine height set to lightly skim the grass surface \u2014 collecting stones without gouging the grass cover. The key is using the correct tine height (slightly higher than for bare soil collection). Korean orchard operators report that the EP-EW-4000 on sward alleys produces clean windrows of surface stones without significant grass disturbance when correctly set. Where frost heave produces stones embedded in the grass mat (not just lying on the surface), a slower forward speed (3\u20134 km\/h) and slightly lower tine height improves collection completeness on these partially embedded stones.<\/p>\n<\/details>\n<details style=\"border-bottom: 1px solid #eee; padding: 16px 0;\">\n<summary style=\"font-weight: bold; color: #1a1a1a; cursor: pointer; font-size: clamp(14px,1.6vw+8px,16px);\">What is the THOR 2.4 Kit Drawbar requirement for steep Korean orchard terraces?<\/summary>\n<p style=\"margin: 12px 0 0 0; color: #555;\">Korean mountain orchard terraces above 12% gradient require THOR 2.4 Kit Drawbar pull-mode for safe pre-planting stone clearance \u2014 the same threshold as highland agricultural field operations. For orchard terrace pre-planting work specifically, Kit Drawbar mode has an additional advantage: the THOR in drawbar pull-mode has a shorter effective turning radius than in rear three-point-hitch mode, which is critical on narrow orchard terraces where headland turning space is limited by stone walls, slope banks, and adjacent terrace structures. The Kit Drawbar included as standard with every THOR 2.4 supplied through Korea Watanabe makes the machine suitable for the full range of Korean orchard terrace gradients without additional purchase. Confirm specific terrace width and gradient with Korea Watanabe before mobilising the THOR 2.4 for orchard establishment on unusually narrow or steep terrace configurations.<\/p>\n<\/details>\n<details style=\"padding: 16px 0;\">\n<summary style=\"font-weight: bold; color: #1a1a1a; cursor: pointer; font-size: clamp(14px,1.6vw+8px,16px);\">Are stone clearing machines eligible for Korean orchard establishment subsidies?<\/summary>\n<p style=\"margin: 12px 0 0 0; color: #555;\">Yes \u2014 orchard establishment stone clearing machinery is eligible under two overlapping Korean government support programs: (1) The agricultural machinery purchase support program covers stone clearing machines (THOR 2.4, <a style=\"color: #f07c00; text-decoration: none; font-weight: bold;\" href=\"https:\/\/rock-crusher-tractor.com\/hi\/product\/ct-2100-rock-picker-110-hp-professional-stone-collector-with-2-5-m\u00b3-bunker-korea-stock\/\">\u0938\u0940\u091f\u0940-2100 \u0930\u0949\u0915 \u092a\u093f\u0915\u0930<\/a>, EP-EW-4000) in the farmland improvement machinery category regardless of whether the destination is an orchard or arable field \u2014 the machine category determines eligibility, not the crop type. (2) The fruit orchard establishment support program (gwasugu joseongsaeopbi jiwon) administered by county agricultural offices provides additional grant support for new orchard establishment on designated agricultural land \u2014 site preparation costs including stone clearing are eligible expenditures under this program. Combining both funding streams \u2014 machinery subsidy for the THOR and CT-2100 purchase, plus orchard establishment grant for the clearance operation itself \u2014 provides the most comprehensive financial support for Korean orchard establishment investment. Korea Watanabe prepares documentation for the machinery purchase subsidy and advises on the orchard establishment grant application process at no charge.<\/p>\n<\/details>\n<\/div>\n<p><!-- CTA --><\/p>\n<div style=\"background: linear-gradient(135deg,#1a1a1a 0%,#2e2e2e 100%); color: #fff; padding: 4%; border-radius: 6px; margin-top: 56px; text-align: center; box-sizing: border-box;\">\n<p style=\"font-size: clamp(17px,2.3vw+9px,26px); font-weight: bold; margin: 0 0 12px 0; color: #f07c00;\">Orchard Stone Clearing \u2014 Pre-Planting or Annual Maintenance Consultation<\/p>\n<p style=\"margin: 0 0 10px 0; color: #ccc; font-size: clamp(13px,1.4vw+8px,15px);\">Fruit species + orchard area (ha) + alley width (m) + slope gradient + phase (establishment or maintenance) \u2192 THOR 2.4 or EP-EW-4000 recommendation with Kit Drawbar slope assessment and subsidy documentation. Korea Watanabe, Ansan-si, Gyeonggi-do.<\/p>\n<p><a style=\"display: inline-block; background: #f07c00; color: #fff; padding: 13px 40px; border-radius: 4px; text-decoration: none; font-weight: bold; font-size: clamp(13px,1.5vw+9px,16px); letter-spacing: .02em; margin-top: 8px;\" href=\"https:\/\/rock-crusher-tractor.com\/hi\/contact-us\/\">\u0939\u092e\u0938\u0947 \u0905\u092d\u0940 \u0938\u0902\u092a\u0930\u094d\u0915 \u0915\u0930\u0947\u0902<\/a><\/p>\n<\/div>\n<p>\u0938\u0902\u092a\u093e\u0926\u0915: \u0938\u0940\u090f\u0915\u094d\u0938\u090f\u092e<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Korean Orchard Stone Clearing \u2014 THOR 2.4 and EP-EW-4000 for Apple, Pear, and Persimmon Farm Establishment and Annual Maintenance Once the orchard is planted, you cannot go back. Korean perennial fruit trees commit to the same granite soil for 20\u201330 years. Pre-planting stone clearance determines every harvest season that follows. Orchard Stone Clearing Consultation Korean [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[31],"tags":[],"class_list":["post-725","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/posts\/725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/comments?post=725"}],"version-history":[{"count":2,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/posts\/725\/revisions"}],"predecessor-version":[{"id":729,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/posts\/725\/revisions\/729"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/media?parent=725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/categories?post=725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/hi\/wp-json\/wp\/v2\/tags?post=725"}],"curies":[{"name":"\u0921\u092c\u094d\u0932\u094d\u092f\u0942\u092a\u0940","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}