{"id":654,"date":"2026-05-26T03:07:56","date_gmt":"2026-05-26T03:07:56","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=654"},"modified":"2026-05-26T03:07:56","modified_gmt":"2026-05-26T03:07:56","slug":"gangwon-do-highland-spring-preparation-master-calendar","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/ja\/gangwon-do-highland-spring-preparation-master-calendar\/","title":{"rendered":"Gangwon-do Spring Preparation Master Calendar \u2014 Every Operation, Every Decision"},"content":{"rendered":"
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<\/p>\n

\n
<\/div>\n
\n

Every Operation, Every Decision, from January Through First Harvest<\/h1>\n

The Korean highland spring calendar compresses 7 sequential operations into 12\u201316 weeks. Every week wasted in January or February costs a week at the end of the harvest window. This is the complete planning guide for getting all operations done correctly and in time.<\/p>\n

\u30b7\u30b9\u30c6\u30e0\u69cb\u6210\u306b\u95a2\u3059\u308b\u30b3\u30f3\u30b5\u30eb\u30c6\u30a3\u30f3\u30b0<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Korean highland potato production at 400\u2013800 m altitude in Gangwon-do operates within one of the most compressed agricultural calendars in Korean farming. The planting window opens around April 20 (at 600 m) and the harvest window closes at first frost (late September to early October at the same altitude). Everything \u2014 stone clearing, tillage, furrowing, fertilizer application, planting, hilling, and harvest \u2014 must be sequenced, timed, and executed within this 5\u20136 month window.<\/p>\n

Farmers who treat this calendar as flexible \u2014 starting stone clearing in late April because “there’s still time” \u2014 consistently find themselves compressing downstream operations, pushing planting past the optimal window, or rushing harvest before the frost. Farmers who treat January through March as preparation months \u2014 planning, equipment ordering, subsidy applications, seed ordering, and soil work \u2014 arrive at the April planting window with every operation ready to execute on schedule.<\/p>\n

This master calendar covers every significant operation and decision in the Gangwon-do highland potato production year, from January planning through the following autumn’s post-harvest management. Altitude-specific timing adjustments are provided throughout \u2014 because the same operation must be timed 7\u201314 days earlier at 400 m than at 700 m.<\/p>\n

<\/p>\n

Altitude Timing Reference \u2014 Use This Throughout the Calendar<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Operation<\/th>\n400 m altitude<\/th>\n600 m altitude<\/th>\n800 m altitude<\/th>\n<\/tr>\n<\/thead>\n
Soil thaw confirmed<\/td>\nMar 10\u201318<\/td>\nMar 20\u201328<\/td>\nApr 1\u201310<\/td>\n<\/tr>\n
\u77f3\u306e\u9664\u53bb<\/td>\nMar 12\u201322<\/td>\nMar 22\u2013Apr 3<\/td>\nApr 3\u201314<\/td>\n<\/tr>\n
PSW-3200 tillage<\/td>\nMar 20\u201328<\/td>\nApr 1\u201310<\/td>\nApr 10\u201320<\/td>\n<\/tr>\n
Furrowing + fertilizer<\/td>\nMar 28\u2013Apr 5<\/td>\nApr 8\u201315<\/td>\nApr 17\u201322<\/td>\n<\/tr>\n
Planting window<\/td>\nApr 10\u201325<\/td>\nApr 20\u2013May 5<\/td>\nMay 1\u201315<\/td>\n<\/tr>\n
Hilling (EP-ERA)<\/td>\nMay 5\u201320<\/td>\nMay 15\u2013Jun 1<\/td>\nMay 25\u2013Jun 10<\/td>\n<\/tr>\n
Harvest window<\/td>\nAug 1\u2013Sep 15<\/td>\nAug 10\u2013Sep 25<\/td>\nAug 15\u2013Oct 5<\/td>\n<\/tr>\n
First frost risk<\/td>\nSep 20\u2013Oct 5<\/td>\nSep 25\u2013Oct 5<\/td>\nSep 20\u2013Oct 1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

January \u2014 The Month That Determines the Season<\/h2>\n

\"THOR<\/p>\n

January is the most important planning month of the Korean highland farming year \u2014 even though no field work can be done. The decisions made in January determine whether the spring sequence runs smoothly or becomes a compressed scramble in March and April. January checklist:<\/p>\n

\n
\u25a1<\/span><\/p>\n

Confirm stone clearing machine readiness or contractor booking.<\/strong> If you own the \u30c8\u30fc\u30eb 2.4<\/a>: inspect teeth, confirm gearbox oil, check Kit Drawbar components. If hiring a contractor: book now \u2014 popular contractors are fully committed by February in Gangwon-do highland areas.<\/p>\n<\/div>\n

\u25a1<\/span><\/p>\n

Order certified seed potato () now.<\/strong> Popular certified varieties (Atlantic, , , ) are allocated on application. Seed supply is limited \u2014 delayed ordering means no seed available for your preferred variety in your farm’s production zone. Coordinate with your cooperative or direct buyer if the seed variety is contract-specified.<\/p>\n<\/div>\n

\u25a1<\/span><\/p>\n

Submit agricultural machinery subsidy application (if applicable).<\/strong> County budgets open January 2. Applications submitted in January have the highest success rate before budget depletes.<\/p>\n<\/div>\n

\u25a1<\/span><\/p>\n

Review soil test results from autumn (Year 0).<\/strong> Confirm lime and amendment requirement based on soil test. Order lime if pH correction is needed \u2014 autumn lime application is ideal, but February application with early PSW-3200 incorporation is still valuable before first planting.<\/p>\n<\/div>\n

\u25a1<\/span><\/p>\n

Confirm supply chain and contract terms.<\/strong> Fresh market cooperative delivery schedule, processing plant intake schedule, or seed potato delivery terms \u2014 confirm all contract terms and delivery dates before the season starts so harvest logistics can be planned accordingly.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

February\u2013March \u2014 Equipment and Soil Readiness<\/h2>\n

February and early March are for equipment preparation and any remaining pre-season soil work that can be done before the soil is suitable for full cultivation operations. Key activities:<\/p>\n

\n
\n

February \u2014 Equipment Pre-Season Service<\/p>\n

Full pre-season service on all machinery \u2014 THOR 2.4 (tooth check, gearbox oil), PSW-3200 (blade wear, gearbox oil), EP-R-380 furrower (shin condition), EP-PAI-2100 planter (seed cup inspection, gear selection confirmation), EP-ERA cultivator (arm spacing verification), EP-AWB-1600 digger (share condition). Order replacement parts for worn items now \u2014 not when they fail during the season.<\/p>\n<\/div>\n

\n

Early March \u2014 Lime Application (if soil still frozen or partially)<\/p>\n

For fields where autumn lime was not applied, broadcast lime as soon as fields are accessible (even partial freeze). Early March lime on partially thawed soil will dissolve and begin reacting before full thaw \u2014 providing 4\u20136 weeks of reaction time before the first PSW-3200 tillage pass incorporates it.<\/p>\n<\/div>\n

\n

Late March \u2014 Soil Thaw Assessment<\/p>\n

Walk each field after thaw and assess: (1) soil moisture status \u2014 use the squeeze test (soil at 10 cm depth squeezed into a ball; if it crumbles, it is ready for tillage; if it remains plastic and sticky, it is too wet and tillage will cause structural damage). (2) Stone emergence \u2014 assess frost-heave density to determine whether THOR crusher or EP-EW-4000 rake is appropriate for each field section.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Late March \u2014 The Stone Clearing Window (The Gate That Opens the Season)<\/h2>\n

Stone clearance is the first field operation of the season \u2014 the gate that must open before everything else can proceed. Starting stone clearing as early as the soil allows (typically late March after thaw confirmation at 600 m) is the single most important action in the spring preparation sequence. For each day stone clearing is delayed, everything downstream is compressed by one day toward the planting window deadline.<\/p>\n

\n
\u2460<\/span><\/p>\n

Day 1\u20133: EP-EW-4000 assessment and light-stone rake pass.<\/strong> For established fields, the EP-EW-4000 rake at 4\u20136 km\/h covers the field quickly and collects light frost-heave stones below 40 Kg. This pass simultaneously identifies heavy-stone zones where the THOR 2.4 is needed. CT-2100 follows for collection.<\/p>\n<\/div>\n

\u2461<\/span><\/p>\n

Day 2\u20135: THOR 2.4 on heavy-stone zones.<\/strong> Deploy the THOR 2.4 (180 HP, Kit Drawbar on slope sections) on field zones where rake assessment revealed stones above 40 Kg. CT-2100 collection follows the THOR pass. On new land or after severe frost winters, the full THOR 2.4 pass across the complete field is appropriate without rake pre-assessment.<\/p>\n<\/div>\n

\u2462<\/span><\/p>\n

Day 3\u20136: Post-crusher rake and final collection.<\/strong> EP-EW-4000 rake pass over THOR-crushed zones windrows the crushed aggregate. CT-2100 final collection pass. Field surface should now be clear of all stones above 3\u20135 cm.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

April \u2014 From Cleared Field to Planting-Ready Ridge<\/h2>\n

\"PSW-3200<\/p>\n

April is the most operationally intensive month \u2014 five sequential operations must be completed before the April 20 planting window opens at 600 m altitude:<\/p>\n

\n
\n
Apr 1\u20138<\/div>\n

PSW-3200\u30ed\u30fc\u30bf\u30ea\u30fc\u8015\u3046\u3093\u6a5f<\/a> primary tillage \u2014 1000 RPM, 25\u201328 cm depth (60 m alt: Apr 1\u20138; 800 m alt: Apr 10\u201320)<\/p>\n<\/div>\n

\n
Apr 7\u201312<\/div>\n

Furrowing \u2014 EP-R-380 (3-row) or EP-R-580 (5-row) sets the ridge geometry that all subsequent operations depend on. Confirm row spacing measurement before beginning.<\/p>\n<\/div>\n

\n
Apr 10\u201314<\/div>\n

Base fertilizer \u2014 EP-ADB applicator at furrowing (or PSW-3200 B model combined with tillage). Confirm soil-test-based rates before application.<\/p>\n<\/div>\n

\n
Apr 14\u201318<\/div>\n

Final pre-planting checks \u2014 seed lot identity confirmation, EP-PAI-2100 gear selection calibration, planting depth test pass on 20 m test section, collection logistics confirmation.<\/p>\n<\/div>\n

\n
Apr 20\u2013May 5<\/div>\n

\u26a0 PLANTING WINDOW \u2014 EP-PAI-2100<\/a> or EP-PANTHER. Everything above must be complete before this date at 600 m altitude.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

May Through September \u2014 Growing Season and Harvest<\/h2>\n

\"EP-PAI-2100<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
\u671f\u9593<\/th>\nKey activity<\/th>\nCritical decision \/ trigger<\/th>\n<\/tr>\n<\/thead>\n
Late May<\/td>\nEP-ERA hilling (Step 6)<\/td>\nMust be done before canopy closure \u2014 monitor shoot height from day 18 post-planting<\/td>\n<\/tr>\n
6\u6708\uff5e7\u6708<\/td>\nBlight monitoring + spraying<\/td>\nPreventive fungicide from 3 weeks post-planting; intensify during wet periods<\/td>\n<\/tr>\n
7\u6708\uff5e8\u6708<\/td>\nTyphoon\/rainfall monitoring<\/td>\nPost-typhoon drainage check; late blight risk assessment after heavy rainfall<\/td>\n<\/tr>\n
Aug (early)<\/td>\nHaulm destruction<\/td>\n2\u20133 weeks before harvest start \u2014 critical for skin set development<\/td>\n<\/tr>\n
Aug 10\u2013Sep 25<\/td>\nHarvest \u2014 EP-AWB-1600<\/td>\nSkin set confirmed; digger share depth set; collection logistics ready<\/td>\n<\/tr>\n
Watch from Sep 15<\/td>\nFirst frost watch<\/td>\n\u26a0 Hard frost ends harvest window \u2014 accelerate harvest on frost forecast<\/td>\n<\/tr>\n
10\u6708\uff5e11\u6708<\/td>\nPost-harvest preparation<\/td>\nStone clearance (autumn), lime if needed, green manure, soil test<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

The 14-Day Buffer Rule \u2014 How to Build Weather Resilience Into the Calendar<\/h2>\n

\"Korean<\/p>\n

The most experienced Korean highland farmers build a 14-day buffer between stone clearance completion and the planting window open date. This buffer protects against weather delays (3 days of rain stopping fieldwork) and equipment downtime (1\u20132 days for unexpected machine repair). Without a buffer, any disruption to the spring preparation sequence cascades forward and pushes planting past the optimal window. With a 14-day buffer, a 3\u20135 day disruption is absorbed without penalty.<\/p>\n

How to build the buffer: start stone clearance 14 days before it is strictly necessary. At 600 m altitude, if the planting window opens April 20 and preparation requires 12 days of fieldwork, start stone clearance on March 25 \u2014 giving 14 days of margin before the April 20 deadline assuming daily fieldwork. This means stone clearing begins as soon as soil thaw is confirmed at this altitude, typically March 20\u201325 \u2014 matching the timing in the altitude reference table at the beginning of this guide.<\/p>\n

The three actions that maximise the buffer at no additional cost: (1) autumn stone clearance in October\u2013November of the previous year eliminates the most time-consuming stone clearing from the spring calendar entirely; (2) PSW-3200 Model B (combined tillage + fertilizer) reduces spring field passes by one; (3) all equipment pre-serviced in February so no service-related downtime occurs during the preparation sequence.<\/p>\n

The spring calendar described in this guide applies to Gangwon-do highland potato as the primary crop. For operations also growing highland radish or Chinese cabbage on the same land, the same calendar framework applies \u2014 stone clearance and tillage timing identical, with seeding or transplanting dates adjusted to each crop’s optimal window at the relevant altitude. Korea Watanabe provides season-specific guidance on request.<\/p>\n

<\/p>\n

Post-Harvest Autumn Work \u2014 Locking in Next Year’s Spring Buffer<\/h2>\n

The actions taken in October and November directly determine how smoothly the following spring’s preparation calendar runs. Korean highland farmers who use the post-harvest window productively reduce their spring workload by 30\u201350% \u2014 creating the buffer that protects against weather and equipment disruptions.<\/p>\n

\n
\u2460<\/span><\/p>\n
Autumn stone clearance (October\u2013November).<\/strong> Running the THOR 2.4 + CT-2100 in autumn after harvest removes the deep embedded stones before the winter frost cycle. Spring clearance then handles only frost-heave emergence \u2014 typically manageable by EP-EW-4000 rake alone in established fields. This single action eliminates 3\u20137 days from the spring preparation sequence and is the most high-value post-harvest investment a Korean highland farmer can make.<\/div>\n<\/div>\n
\u2461<\/span><\/p>\n
Lime application with PSW-3200 autumn incorporation.<\/strong> Lime applied in October\u2013November and incorporated by a PSW-3200 autumn tillage pass has 16\u201320 weeks to react before spring planting \u2014 more than double the reaction time available from spring application. This produces more complete pH correction before the first crop is planted. Autumn lime also improves soil structural aggregation over the winter freeze-thaw period \u2014 reducing compaction from spring tractor passes.<\/div>\n<\/div>\n
\u2462<\/span><\/p>\n
Soil sampling and test submission (October\u2013November).<\/strong> Autumn soil testing gives results back in December \u2014 in time to order amendments before January. Soil tests submitted after the spring thaw return results in April \u2014 too late to adjust lime or fertilizer programs before planting. The 4\u20135 month autumn-to-spring lead time converts soil test results into actionable amendments before the season starts.<\/div>\n<\/div>\n
\u2463<\/span><\/p>\n
Green manure seeding (October \u2014 after harvest).<\/strong> Rye or hairy vetch seeded in October grows into spring, adding organic matter when incorporated by the first PSW-3200 April pass. The green manure also suppresses winter annual weeds and reduces soil erosion on slopes through the freeze period. For farms on newly cleared land building organic matter, the autumn green manure seeding is an essential complement to the stone clearing investment \u2014 it is the organic matter input that builds the soil that the stone clearing has made accessible.<\/div>\n<\/div>\n<\/div>\n

Equipment and Machinery Planning \u2014 What to Order and When<\/h2>\n

Korea Watanabe machines for the following spring season should be ordered in January\u2013February at the latest, with earlier ordering (November\u2013December) recommended for first-time purchases that require a new tractor compatibility check. Key lead times that affect spring preparation planning:<\/p>\n

\n
\n

THOR 2.4 (in Korean stock)<\/p>\n

Korea Watanabe holds Korean local stock \u2014 standard delivery 5\u201310 business days after order confirmation and tractor compatibility check.<\/p>\n<\/div>\n

\n

PSW-3200, potato machinery<\/p>\n

Confirm availability in January. All major potato machinery models held in Korean stock. Allow 10\u201315 business days for delivery and installation setup.<\/p>\n<\/div>\n

\n

Subsidy approval timing<\/p>\n

Subsidy applications submitted January 2\u201315 typically receive approval by late January or February \u2014 allowing purchase and delivery before late March stone clearing begins.<\/p>\n<\/div>\n<\/div>\n

Weather Risk Management \u2014 Protecting the Calendar from Korean Highland Climate<\/h2>\n

Three specific Korean highland weather events can derail the spring preparation calendar. Understanding each risk and its mitigation is as important as understanding the calendar itself:<\/p>\n

\n
\n

Late Spring Rainfall \u2014 March to April<\/p>\n

Persistent rainfall in late March or April delays soil thaw confirmation and prevents field access for stone clearing and tillage. In years with late wet springs (historically occurring every 3\u20135 years in Gangwon-do), the stone clearing window can be compressed to 5\u20137 days rather than 12\u201314 days. The mitigation is autumn stone clearing the previous October \u2014 removing stone clearing entirely from the spring calendar so rainfall delays affect only tillage and planting preparation rather than the longer stone clearing operation.<\/p>\n<\/div>\n

\n

Cold Snap After Planting \u2014 Late April to May<\/p>\n

The Korean spring cold snap (typically late April) can damage emerged shoots at 600 m altitude. Mitigation: confirm the 10-day forecast before committing to the planting date. If a below-freezing night is forecast within 12 days of expected emergence (estimated as 10\u201314 days after planting), delay planting of remaining sections. A correctly managed 14-day calendar buffer absorbs a 3\u20135 day planting delay without pushing the completion date past the May 10 window closure at 600 m.<\/p>\n<\/div>\n

\n

Early Autumn Frost \u2014 September<\/p>\n

At 700\u2013800 m altitude, the first killing frost can arrive as early as late September \u2014 potentially before harvest is complete on late-planted sections. Monitoring the 10-day forecast from September 15 and accelerating harvest on frost warnings is the primary mitigation. Late-planted sections (from a compressed spring calendar) are disproportionately at risk of frost damage at harvest \u2014 the operational cost of late planting is ultimately expressed at the end of the season in frost-affected yield loss.<\/p>\n<\/div>\n<\/div>\n

Equipment Pre-Season Checklist \u2014 February Service<\/h2>\n

A complete February pre-season equipment service prevents the mid-season breakdown scenarios that are most damaging to the compressed highland calendar. The following checklist covers every machine in the 7-step system:<\/p>\n

\n
\n

\u25a1<\/span><\/p>\n

THOR 2.4:<\/strong> Tooth height measurement on all 90 teeth; counter-tooth inspection; gearbox oil level and condition; PTO shaft universal joints; Kit Drawbar pivot lubrication and pin condition.<\/p>\n<\/div>\n

\n

\u25a1<\/span><\/p>\n

CT-2100 Rock Picker:<\/strong> Bunker discharge mechanism function; pick-up reel tine condition; hydraulic hose inspection; bunker seals for stone retention.<\/p>\n<\/div>\n

\n

\u25a1<\/span><\/p>\n

PSW-3200 Rotavator:<\/strong> Blade wear measurement (replace if below 60% of new length); gearbox oil change (annual); rotor bearing lubrication; PTO shaft condition.<\/p>\n<\/div>\n

\n

\u25a1<\/span><\/p>\n

EP-PAI-2100 Planter:<\/strong> Seed cup inspection (replace cracked or worn cups); gear selector mechanism; hopper seals; planting depth adjustment mechanism function.<\/p>\n<\/div>\n

\n

\u25a1<\/span><\/p>\n

EP-AWB-1600 Digger:<\/strong> Share condition (replace if worn or cracked); web conveyor chain tension; discharge elevator chain; depth control mechanism.<\/p>\n<\/div>\n

\n

\u25a1<\/span><\/p>\n

All machines:<\/strong> Confirm spare part inventory for high-wear items \u2014 tooth set for THOR, share set for digger, blade pack for rotavator. Order replacements in February so they arrive before the March\u2013April season start.<\/p>\n<\/div>\n<\/div>\n

\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n
\n
\nWhat happens if we get a cold snap after planting \u2014 can late April snow or frost damage emerged shoots?<\/summary>\n

Korean highland potato shoots that have emerged above the ridge surface are damaged by air temperatures below -2\u00b0C for more than a few hours \u2014 the emerged shoot tissue is frost-sensitive. Late April cold snaps (known as , spring cold snap, in Korean) are not uncommon in Gangwon-do highland areas. Risk mitigation: (1) plant when the soil thermometer at 8\u201310 cm depth reads consistently above 8\u00b0C \u2014 soil temperature is a better planting readiness indicator than air temperature for Korean highland conditions; (2) if a frost forecast is issued within 5 days of expected emergence, delay planting of remaining un-planted sections until the frost risk period passes. Damaged shoots from frost typically recover from the axillary buds at the seed piece node \u2014 but recovery loses 5\u201310 days of growing time from the compressed season.<\/p>\n<\/details>\n

\nMy farm has fields at both 400 m and 700 m altitude \u2014 how do I sequence operations across two different timing zones?<\/summary>\n

Multi-altitude farms have a natural scheduling advantage: lower-altitude fields (400 m) thaw earlier and can begin stone clearing and tillage 10\u201314 days before upper-altitude fields (700 m). This staggered start allows the farm’s tractor and machine resources to work sequentially \u2014 complete lower-altitude stone clearing (March 15\u201322), move to lower-altitude tillage and furrowing (March 22\u2013April 1), then begin upper-altitude stone clearing (March 28\u2013April 5) while lower-altitude fields are being planted (April 10\u201320). This altitude-staggered approach distributes the compressed spring preparation workload over a longer calendar window, reducing the per-day machine intensity and providing natural redundancy against weather disruptions affecting a single altitude zone.<\/p>\n<\/details>\n

\nCan I prepare my fields in autumn and skip the spring stone clearing pass?<\/summary>\n

Yes \u2014 for established highland fields (3+ years of THOR+CT-2100 management history), autumn stone clearing in October\u2013November substantially reduces or eliminates the spring stone clearing requirement. If autumn clearance is thorough, spring pre-planting assessment typically shows only the light frost-heave from the intervening winter \u2014 manageable with the EP-EW-4000 rake rather than requiring the THOR crusher. Farmers who complete thorough autumn clearance save 3\u20137 days from the spring preparation sequence \u2014 creating the 14-day buffer discussed above without any additional spring machine investment. For new land or severe frost-heave winters, the spring THOR pass remains necessary regardless of autumn clearing history.<\/p>\n<\/details>\n

\nHow do I confirm that soil thaw is complete enough to begin stone clearing?<\/summary>\n

Two tests confirm adequate soil thaw for stone clearing and tillage operations. First, the squeeze test: take a handful of soil from 15 cm depth and squeeze firmly \u2014 if the soil forms a ball that crumbles when released with light pressure, the moisture content and temperature are correct for field operations. If it remains plastic and sticky, the soil is still too wet from thaw and field operations will cause structural damage. Second, the penetration test: push a steel rod (8\u201310 mm diameter) to 30 cm depth by hand pressure \u2014 if it penetrates without significant resistance, the soil is thawed to cultivation depth. If resistance is felt at 10\u201315 cm, frost is still present at depth and THOR operation will encounter frozen soil that increases tooth stress and reduces fragmentation quality.<\/p>\n<\/details>\n

\nWhat is the consequence of late planting at Gangwon-do highland altitudes?<\/summary>\n

Each day of planting delay past the optimal window at a given altitude reduces final yield by a measurable amount \u2014 the primary mechanism is reduced days to first frost from the later planting date. At 600 m altitude, planting on May 10 rather than April 25 reduces the growing season by 15 days \u2014 equivalent to losing 10\u201315% of the total yield accumulation period for the potato crop. Varieties with 90-day maturity periods planted 15 days late are harvested 15 days later \u2014 but first frost may arrive before the full maturity period has elapsed, resulting in immature tubers with lower dry matter content and reduced Grade 1 proportion. The compressed spring preparation calendar described in this guide exists entirely to protect the April 20\u2013May 5 planting window at 600 m altitude \u2014 every day of preparation compression is a day of growing season protected.<\/p>\n<\/details>\n<\/div>\n

<\/p>\n

\n

Spring Calendar Consultation \u2014 Altitude + Area + Equipment Status<\/p>\n

Farm altitude (m) + area (ha) + current machinery ownership + target planting date \u2192 customised spring preparation calendar with machine scheduling and buffer analysis. Korea Watanabe, Ansan-si, Gyeonggi-do.<\/p>\n

\u4eca\u3059\u3050\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044<\/a><\/p>\n<\/div>\n

\u7de8\u96c6\u8005: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Every Operation, Every Decision, from January Through First Harvest The Korean highland spring calendar compresses 7 sequential operations into 12\u201316 weeks. Every week wasted in January or February costs a week at the end of the harvest window. This is the complete planning guide for getting all operations done correctly and in time. System Configuration Consultation Korean highland potato production at 400\u2013800 m altitude in Gangwon-do operates within one of the most compressed agricultural calendars in Korean farming. The planting window opens around April 20 (at 600 m) and the harvest window closes at first frost (late September to early October at the same altitude). Everything \u2014 stone clearing, tillage, […]<\/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-654","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/posts\/654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/comments?post=654"}],"version-history":[{"count":2,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/posts\/654\/revisions"}],"predecessor-version":[{"id":656,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/posts\/654\/revisions\/656"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/media?parent=654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/categories?post=654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/ja\/wp-json\/wp\/v2\/tags?post=654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}