{"id":1031,"date":"2026-06-15T08:59:12","date_gmt":"2026-06-15T08:59:12","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=1031"},"modified":"2026-06-15T08:59:12","modified_gmt":"2026-06-15T08:59:12","slug":"rock-crusher-for-strawberry-farm","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/nl\/rock-crusher-for-strawberry-farm\/","title":{"rendered":"Steenbreker voor aardbeienkwekerij"},"content":{"rendered":"
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STRAWBERRY FARM APPLICATION<\/span><\/div>\n

Rock Crusher for Strawberry Farm \u2014 Korea Spain and Chile Guide<\/h1>\n

At 8 cm \u2014 shallower than any root system in this guide \u2014 a stone ends a season before the first fruit forms.<\/p>\n

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8\u201312 cm<\/div>\n
Drip tape depth<\/div>\n<\/div>\n
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3\u00d7<\/div>\n
Seolhyang Brix premium<\/div>\n<\/div>\n
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Same season<\/div>\n
ROI payback period<\/div>\n<\/div>\n<\/div>\n

Strawberry Farm Consultation<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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<\/p>\n

Every crop in this E-series guide \u2014 from vineyard to coffee \u2014 has justified stone clearing by the same core argument: stone in the root zone restricts root development, reduces yield and quality, and the removal cost is repaid over a multi-year production cycle. Strawberry breaks this pattern in almost every respect. It is an annual or biennial crop. Its stone problem is at a depth shallower than any root system in this guide. Its clearing benefit is realised in the same season that clearing is performed. And its premium quality market \u2014 the Korean tunnel strawberry industry, producing the world’s most expensive commercial strawberries at scale \u2014 creates the highest per-hectare value of any crop in this guide at approximately US$180,000\u2013400,000 per hectare for premium Seolhyang production.<\/p>\n

The stone management argument for strawberry begins not with the root zone but with the drip irrigation system. A drip tape buried at 8\u201312 cm depth \u2014 shallower than any structural root in the asparagus, avocado, walnut, or coffee articles \u2014 is punctured by a single angular stone fragment during bed formation. That puncture drops the line pressure in the affected bed section from the designed 0.8\u20131.2 bar to near zero, preventing uniform water delivery to the entire run of plants above it. No other crop in this guide fails this completely, this quickly, from a single stone. This guide covers the rock crusher for strawberry farm<\/strong> application through the three mechanisms that make strawberry stone management categorically different from all prior E-series articles, and the four global markets where those mechanisms converge.<\/p>\n

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Drip Tape at 8\u201312 cm \u2014 The Shallowest Clearing Target in This Guide<\/h2>\n

\"THOR<\/p>\n

The defining characteristic of modern commercial strawberry production is the plasticulture system: raised beds of 20\u201330 cm height, formed by a bed-shaping machine that simultaneously shapes the soil, lays black polyethylene mulch, and buries the drip tape at 8\u201312 cm depth in a single pass. This system \u2014 standard practice in Korea, Spain, California, and Chile \u2014 delivers the water and fertiliser directly to the strawberry root mat with minimal evaporation loss and maximised disease suppression from the dry soil surface above the plastic.<\/p>\n

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\u2460<\/span><\/p>\n
The bed-forming pass \u2014 where stone meets drip tape.<\/strong> During the single machine pass that forms the raised bed, the bed-shaping coulters slice through the soil at 20\u201325 cm depth to create the mounded profile, and simultaneously a coulter at 8\u201312 cm depth buries the drip tape. The tape is 16\u201322 mm polyethylene, typically 0.15\u20130.20 mm wall thickness in the strawberry specification. An angular stone fragment \u2014 limestone, quartzite, or basalt \u2014 at 8\u201312 cm in the coulter path contacts the tape under the compression load of the depth coulter (typically 40\u201380 Kg force per coulter). The tape wall failure threshold for angular stone contact under compression is approximately 0.8\u20131.2 Kg\/mm\u00b2 point load \u2014 achieved by a fragment as small as 8\u201312 mm at its contact point on the tape wall. Field validation in Korean strawberry districts: on sites with 8\u201312% stone coverage at 8\u201312 cm depth, tape puncture rates of 15\u201335% of bed runs occur in the installation pass alone, before any crop load is applied.<\/div>\n<\/div>\n
\u2461<\/span><\/p>\n
Pressure drop consequences \u2014 immediate production failure.<\/strong> Drip tape systems in strawberry production are designed to maintain \u00b15% flow uniformity across the entire bed run \u2014 critical for uniform Brix development, uniform plant size, and uniform ripening timing (which determines harvest schedule and premium market synchronisation). A single puncture in a 60\u201380 m bed run drops the operating pressure in that section from 0.8 bar to near zero within 48 hours of a rain event or the first irrigation cycle that saturates the surrounding soil (soil moisture around the puncture equalises pressure with the tape internal pressure). Plants above the pressure-drop zone receive no drip supply but continued fertigation through their neighbours, producing heterogeneous plant size \u2014 some over-irrigated, most under-irrigated \u2014 within the same bed run. In Korean premium tunnel production, a bed run failure is typically identified only during the first fruit set inspection, by which time 6\u20138 weeks of growth have occurred at suboptimal irrigation. The affected plants cannot achieve the required Brix for premium grade.<\/div>\n<\/div>\n
\u2462<\/span><\/p>\n
Pre-bed-formation clearing \u2014 the only prevention.<\/strong> The bed-forming machine makes its pass only once \u2014 after the drip tape is installed, any damage is sealed inside the raised bed under the plastic mulch, inaccessible without destroying the bed and replanting. Pre-bed-formation stone clearing \u2014 THOR 2.4 at 15\u201322 cm depth, removing all fragments above 3 cm \u2014 is the only effective intervention. This clearing depth is the shallowest in any article in this E-series guide: 15\u201322 cm, compared to 28\u201338 cm for trifoliate citrus (E-13), 40\u201355 cm for avocado drainage zone (E-12), or 65\u201380 cm for California walnut Paradox rootstock (E-15). The THOR’s forward speed for strawberry clearing is consequently the highest in the series: 3.5\u20134.5 km\/h on standard field stone at this shallow depth, compared to 0.6\u20131.5 km\/h for deep permanent crop clearing.<\/div>\n<\/div>\n<\/div>\n

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E-Series Clearing Depth Spectrum \u2014 Strawberry vs All Prior Crops<\/p>\n

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8\u201322 cm<\/div>\n
\ud83c\udf53 STRAWBERRY E-18<\/div>\n
drip tape depth<\/div>\n<\/div>\n
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20\u201328<\/div>\n
Lavender<\/div>\n<\/div>\n
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25\u201335<\/div>\n
Blueberry<\/div>\n<\/div>\n
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28\u201338<\/div>\n
Citrus\/Hazelnut<\/div>\n<\/div>\n
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38\u201350<\/div>\n
Asparagus\/Coffee<\/div>\n<\/div>\n
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45\u201355<\/div>\n
Avocado\/Walnut<\/div>\n<\/div>\n
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55\u201380<\/div>\n
Walnut caliche<\/div>\n<\/div>\n<\/div>\n
Strawberry clearing at 8\u201322 cm is 3\u00d7 shallower than the next most shallow application. The THOR forward speed is correspondingly 2\u20133\u00d7 faster.<\/div>\n<\/div>\n<\/div>\n

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Fumigation Stone Refugia \u2014 Why Stones Preserve the Pathogens You Are Trying to Kill<\/h2>\n

\"CT-2100<\/p>\n

Most strawberry production in commercial intensively managed districts requires pre-plant soil fumigation to break the cycle of soilborne diseases \u2014 primarily Fusarium oxysporum<\/em> f. sp. fragariae<\/em> (Fusarium crown and root rot), Verticillium dahliae<\/em> (Verticillium wilt), and Pratylenchus penetrans<\/em> En Meloidogyne<\/em> spp. (root-knot nematodes). The fumigants used \u2014 1,3-dichloropropene\/chloropicrin combination (Telone II\/Pic), dazomet (Basamid), or metam sodium \u2014 function as gases that diffuse through the soil pore network from the injection point. Their efficacy depends entirely on achieving uniform gas distribution throughout the treated volume before the soil is sealed with the polyethylene mulch.<\/p>\n

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The gas diffusion problem in stone-laden soil<\/strong><\/p>\n

Fumigant gas diffuses through the soil via the inter-particle pore network \u2014 the spaces between soil particles. In fine-textured soil with uniform particle size (silt loam or sandy loam), gas diffuses at consistent rates in all directions from the injection point. A stone at 5\u201325 cm depth is effectively impermeable to fumigant gas \u2014 its dense crystalline or sedimentary structure has no connected pore network accessible to the gas. The stone creates a “shadow zone” behind it (in the direction away from the injection point) where fumigant concentration never reaches the lethal threshold for the target organisms. Size of shadow zone: approximately 2\u20133\u00d7 the stone’s cross-sectional diameter. A 6 cm stone creates a 12\u201318 cm shadow zone \u2014 sufficient to protect a Fusarium colony or nematode population through the full fumigation period.<\/p>\n<\/div>\n

Re-inoculation within 6\u20138 weeks<\/strong><\/p>\n

The fumigant dissipates from the soil within 7\u201314 days of injection (the purpose of sealing the plastic mulch is to extend this window). After plastic removal or perforation for planting, the surviving pathogen populations in stone shadow zones begin expanding immediately \u2014 they are now the only inoculum source in the field, operating from the protected stone refugia. Fusarium spreads through soil at approximately 2\u20135 cm per week in moist conditions; nematodes migrate 10\u201330 cm per week. Within 6\u20138 weeks of planting, stone shadow zones have re-inoculated the surrounding soil, and within one full season, the fumigation investment has been largely negated. This re-inoculation cycle explains the widely observed phenomenon of “fumigation failure” on stone-laden strawberry fields \u2014 the fumigant was applied correctly, but the stone refugia prevented complete pathogen break.<\/p>\n<\/div>\n

Stone clearing for fumigation efficacy<\/strong><\/p>\n

Pre-plant stone clearing with tractor rock crusher<\/a> followed by CT-2100 steenrapper<\/a> permanent collection eliminates the stone refugia from the fumigation zone. When all stones above 3 cm are removed from the 0\u201322 cm profile, the fumigant gas diffuses uniformly through the entire treated volume without obstruction \u2014 achieving the complete pathogen break that is the purpose of the fumigation investment. UK and California strawberry extension advisories consistently identify stone-free soil preparation as a prerequisite for reliable fumigation efficacy, not a supplementary improvement. Fumigation cost for one hectare of strawberry: typically \u20ac800\u20131,800\/ha. Stone clearing cost: \u20ac600\u20131,200\/ha. The clearing cost is approximately equal to the fumigation cost it protects \u2014 and without clearing, a significant portion of the fumigation investment achieves no lasting disease suppression.<\/p>\n<\/div>\n<\/div>\n

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The Korean Seolhyang Premium \u2014 World’s Most Expensive Commercial Strawberry<\/h2>\n

Korea is the most valuable strawberry market in the world, measured by per-kilogram farmgate price at premium grade. The dominant commercial variety \u2014 Seolhyang (meaning “snow fragrance”) \u2014 was developed by the Rural Development Administration in 2005 specifically for Korea’s cold-season tunnel production system. At the Korean premium wholesale market, Seolhyang priced at Brix \u226514.0 routinely achieves \u20a950,000\u201370,000 per kilogram (approximately US$38\u201353) during the peak December\u2013February season \u2014 a price per kilogram approximately 25\u201335 times the Spain Huelva spot price for standard Camarosa in the same period, and approximately 15\u201320 times the California Albion price.<\/p>\n

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Korean Seolhyang Grade and Price Matrix \u2014 Brix, Root Condition, and Market Value<\/caption>\n
Cijfer<\/th>\nBrix<\/th>\nPrice (\u20a9\/kg)<\/th>\nToestand van de wortelzone<\/th>\nStone management<\/th>\n<\/tr>\n<\/thead>\n
Premium (Top Grade)<\/td>\n\u2265 14.0<\/td>\n\u20a950,000\u201370,000<\/td>\nDeep feeder mat (0\u201320 cm) unobstructed. Consistent irrigation. Full Brix accumulation in cold nights.<\/td>\nStone-free to 22 cm. Drip tape undamaged. Fumigation complete.<\/td>\n<\/tr>\n
Grade 1<\/td>\n12.0\u201313.9<\/td>\n\u20a925,000\u201340,000<\/td>\nModerate root restriction from stone. Uneven irrigation from partially compromised drip tape.<\/td>\nSome stone remaining. 5\u201315% drip tape puncture rate. Partial fumigation.<\/td>\n<\/tr>\n
Grade 2<\/td>\n10.0\u201311.9<\/td>\n\u20a912,000\u201322,000<\/td>\nSignificant root restriction. Multiple drip failures. Soilborne disease present from fumigation refugia.<\/td>\nHigh stone density. >20% drip tape puncture. Incomplete fumigation break.<\/td>\n<\/tr>\n
Processing \/ rejection<\/td>\n< 10.0<\/td>\n\u20a93,000\u20138,000<\/td>\nSevere disease, drip failure, root restriction. Plant stunting from combined stone effects.<\/td>\nUn-cleared stone ground. Drip system failed. Soilborne disease unchecked.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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The Korean stone clearing ROI \u2014 same season payback<\/p>\n

For a 2,000 m\u00b2 Korean tunnel strawberry unit (standard single grower unit size): Stone clearing cost (THOR 2.4 + CT-2100 for one 0.2 ha tunnel): approximately \u20a9800,000\u20131,200,000 (US$600\u2013900). Annual production: approximately 3,000 Kg of Seolhyang from 2,000 m\u00b2. Premium grade (Brix \u226514) on cleared ground vs Grade 2 (Brix 11-12) on stone-restricted ground: \u20a960,000 vs \u20a918,000 per Kg. On 30% of production (the fraction typically upgraded from Grade 2 to Premium by stone management alone): 900 Kg \u00d7 \u20a942,000 incremental price = \u20a937,800,000 (US$28,000) additional revenue in Year 1.<\/p>\n

Stone clearing cost of \u20a9800,000\u20131,200,000 against \u20a937,800,000 Year 1 revenue uplift: payback ratio approximately 30:1 to 47:1 in the first production season. No other crop in this E-series guide achieves payback within the same season of the clearing investment.<\/p>\n<\/div>\n

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Annual Crop Economics \u2014 Why Strawberry Stone Clearing Works Differently<\/h2>\n

The economic structure of stone clearing for strawberry is the inverse of every other crop in this guide. In all prior E-series articles \u2014 vineyard (E-1), olive (E-2), asparagus (E-9), hazelnut (E-14), coffee (E-17) \u2014 the clearing investment is amortised over 5\u201350 years of productive orchard or plantation life. The stone clearing cost for strawberry is paid back in a single production cycle, and the benefit recurs every year that the field remains in strawberry production.<\/p>\n

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The three annual benefits that recur<\/strong><\/p>\n

Once a field is stone-cleared to 22 cm and the stone population is permanently removed by CT-2100 collection, three annual benefits recur for the field’s productive life: (1) drip tape puncture rate drops to near zero each season’s bed installation \u2014 tape purchased does the job it was bought for; (2) fumigation achieves complete pathogen break each pre-plant cycle \u2014 the fumigation investment is fully utilised; (3) Brix development is consistent and high each season, achieving premium grade rather than Grade 2. The only recurrent stone management cost is a THOR maintenance pass at 12\u201316 cm after the final harvest strip and before the next season’s bed formation \u2014 to remove frost-heave and root-channel residuals. This maintenance pass costs approximately 20\u201330% of the original clearing investment per year.<\/p>\n<\/div>\n

Why strawberry stone clearing differs from annual vegetable clearing<\/strong><\/p>\n

Standard annual vegetable crops (brassica, root crops, salad) are rotated annually and require soil preparation regardless of stone, so stone clearing for vegetables is often absorbed into the general cultivation programme. Strawberry is typically produced on the same field for 2\u20135 consecutive years before fumigation rotation requires the field to be temporarily taken out of strawberry production. During this consecutive period, the stone clearing investment earns its return in every season. For tunnel strawberry in Korea, where tunnel infrastructure (steel hoops, covering film, heating system) is fixed for 10\u201320 years at one location, the field below the tunnel infrastructure may remain in strawberry for 5\u20138 consecutive cycles \u2014 meaning the clearing investment earns its return 5\u20138 times before any new clearing is needed.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Four Markets \u2014 Stone Profiles and Clearing Specification<\/h2>\n
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\ud83c\uddf0\ud83c\uddf7 Korea \u2014 Chungnam (Nonsan), South Jeolla (Damyang), Gyeongnam (Jinju)<\/span>
\nWorld’s highest farmgate price<\/span><\/div>\n
Korea’s tunnel strawberry industry \u2014 producing Seolhyang, Maehyang, and increasingly Kuemsil varieties in heated polycarbonate tunnels \u2014 sits primarily on upland soils in Chungcheongnam-do and South Jeolla Province. The stone management challenge varies sharply by sub-region. Nonsan and Damyang (lowland alluvial):<\/strong> Former paddy fields with generally low stone density \u2014 the primary clearing need is calcareous concretions at 8\u201318 cm in the transition from paddy to upland crop. THOR 2.4 at 16\u201320 cm, 3.5\u20134.0 km\/h forward speed. Jeolla inland upland (volcanic):<\/strong> Basalt-derived red clay soils with vesicular basalt fragments at 10\u201325 cm \u2014 the most stone-dense environment in Korean tunnel strawberry production. THOR 2.4 at 18\u201322 cm, 2.5\u20133.0 km\/h. Jeju Island greenhouse production:<\/strong> Holocene basalt (Mohs 6\u20137) fragments at 8\u201320 cm \u2014 THOR 2.4 or 3.0 at 18\u201322 cm. The Korean Rural Development Administration (RDA) and the Ministry of Agriculture, Food and Rural Affairs (MAFRA) both operate machinery investment support programmes for tunnel crop establishment \u2014 stone clearing machinery for tunnel strawberry sites may be eligible under the current Smart Farm expansion programme cycle.<\/div>\n<\/div>\n
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\ud83c\uddea\ud83c\uddf8 Spain \u2014 Huelva (EU early-season dominant)<\/span>
\nEU’s largest strawberry exporter<\/span><\/div>\n
Huelva’s Marisma and Condado sub-regions produce over 300,000 tonnes of strawberries per year (Camarosa, Sabrina, Primoris varieties) for the EU fresh market from October\u2013June. The core Huelva soil type \u2014 aeolian sandy soil developed over the Guadalquivir estuary sediments \u2014 is generally very low stone. However, two stone scenarios arise on new land conversions. Interdigitation zones (sandy over calcareous):<\/strong> Where aeolian sand overlies Pliocene calcareous subsoil, calcium carbonate nodules (calcrete) appear at 15\u201330 cm depth under the sand surface \u2014 these dissolve into the sandy soil profile and affect both drip tape installation and fumigation uniformity. THOR 2.4 at 18\u201324 cm. Expansion onto Condado limestone terrace:<\/strong> Huelva’s strawberry area has been expanding northeast onto the Condado plateau limestone soils \u2014 here limestone fragments at 10\u201322 cm require full THOR clearing before plasticulture installation. BlackBird rotshark<\/a> surface pass after THOR on large Huelva developments (10+ ha blocks) provides efficient surface stone collection at 5\u20136 ha\/day before bed-forming machine operation.<\/div>\n<\/div>\n
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\ud83c\uddfa\ud83c\uddf8 California \u2014 Santa Maria, Watsonville, Oxnard coastal fog belt<\/span>
\nYear-round production, largest US volumes<\/span><\/div>\n
California’s coastal strawberry belt runs from Santa Barbara to Santa Cruz \u2014 the marine fog zone where year-round mild temperatures enable continuous strawberry production. The geology varies by sub-region. Santa Maria \/ Lompoc Valley:<\/strong> Marine terrace deposits with Pliocene cobble and gravel at 12\u201330 cm \u2014 one of the more stone-problematic California strawberry zones. THOR 2.4 at 18\u201325 cm; CT-2100 collection essential before fumigation injection. Watsonville \/ Salinas Valley:<\/strong> Deep alluvial valley soils with low stone density \u2014 primary drip tape concern is occasional gravel lenses from buried former stream channels. Oxnard Plain:<\/strong> Ventura alluvial fan with moderate cobble at 15\u201325 cm from the Santa Monica Mountains drainage. California’s CDFA (California Department of Food and Agriculture) strawberry production regulations include soil preparation standards under the USDA Specialty Crop Block Grant programme \u2014 stone clearing documentation may support grant applications for soil health improvement practices.<\/div>\n<\/div>\n
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\ud83c\udde8\ud83c\uddf1 Chile + \ud83c\uddf5\ud83c\uddf1 Poland \u2014 counter-season and outdoor production<\/span>
\nGrowing export markets<\/span><\/div>\n
Chile (Metropolitana, Maule, B\u00edo B\u00edo regions):<\/strong> Chile’s winter-to-spring production (October\u2013December) supplies Northern Hemisphere off-season demand. The same Andean volcanic + alluvial stone profile described for Chilean avocado (E-12) and blueberry (E-16) applies here, but at shallower clearing depth for strawberry (THOR 2.4 at 16\u201320 cm). Chile’s outdoor raised-bed plasticulture uses the same drip tape depth as Korean tunnels. Poland (\u0141\u00f3d\u017a, Mazovia, Lublin regions):<\/strong> Poland is Europe’s largest outdoor strawberry producer (~200,000 tonnes). The glacial till geology of Poland’s central plain \u2014 the same continental glacial system described for Pacific Northwest blueberry in E-16 \u2014 deposits mixed limestone and crystalline stone at 10\u201325 cm depth across the main strawberry zone. THOR 2.4 at 16\u201320 cm for outdoor Poland production (lower tunnel investment per site, fumigation budget determines clearing economics proportionally differently than Korea).<\/div>\n<\/div>\n<\/div>\n

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Machine System \u2014 Pre-Season Clearing Protocol for Plasticulture Strawberry<\/h2>\n

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

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1<\/div>\n
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THOR 2.4<\/a> \u2014 pre-bed-formation clearing, 15\u201322 cm<\/strong><\/p>\n

Shallowest and fastest operation in the E-series. 3.5\u20134.5 km\/h on standard field stone (Mohs 3\u20135). Reduce to 2.5\u20133.0 km\/h on volcanic basalt upland sites (Korea Jeju, California coastal). THOR 2.4 preferred over THOR 3.0 for strawberry: the 3.0’s wider working width (3.0m) matches field scale for large outdoor operations, but on Korean tunnel floor preparation (typically 6\u20138m tunnel width, working in sections), THOR 2.4 provides better bed-row precision. Always clear all stone visible at surface plus the sub-surface zone to 22 cm.<\/p>\n<\/div>\n<\/div>\n

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2<\/div>\n
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CT-2100 steenrapper<\/a> \u2014 permanent collection before fumigation<\/strong><\/p>\n

Permanent collection eliminates stone refugia from the fumigation zone. For large outdoor operations (10+ ha), the BlackBird rotshark<\/a> surface pass at 5\u20136 ha\/day precedes CT-2100 deep collection, gathering surface fragments efficiently. CT-2100 bunker fill rate for shallow strawberry clearing: typically every 0.8\u20131.5 ha (versus 0.2\u20130.4 ha for walnut caliche) because the shallow clearing depth produces lower volume per pass.<\/p>\n<\/div>\n<\/div>\n

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3<\/div>\n
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PSW-3200 rotorkultivator<\/a> \u2014 fumigation bed preparation<\/strong><\/p>\n

Fine-tilth bed preparation at 20\u201325 cm for uniform fumigant gas distribution. Incorporates pre-plant fertiliser and organic amendments. Creates the loose, friable bed structure that the bed-forming machine requires for correct profile shaping. On Korean tunnel sites: PSW-3200 incorporates pH correction (strawberry requires pH 5.8\u20136.5) and potassium sulphate for Brix development before fumigation and plastic installation.<\/p>\n<\/div>\n<\/div>\n

\n
\u21bb<\/div>\n
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Annual maintenance \u2014 post-strip THOR pass before next bed season<\/strong><\/p>\n

After final harvest strip and plastic removal: THOR 2.4 at 12\u201316 cm removes frost-heave residuals and any stone migration from the previous season’s irrigation and cultivation. Cost approximately 25\u201330% of the original clearing investment. This annual maintenance pass ensures the fumigation zone remains stone-free for consecutive seasons of tunnel or outdoor strawberry production.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Veelgestelde vragen<\/h2>\n
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\nRock crusher for strawberry farm \u2014 why is the THOR needed at only 15-22 cm when the machine is designed for 40-80 cm permanent crop clearing?<\/summary>\n

The THOR’s design operating range spans from its minimum clearing depth (approximately 10\u201312 cm) to its maximum (50\u201360 cm depending on model). For strawberry clearing at 15\u201322 cm, the THOR operates at the shallow end of its range \u2014 which means it runs at significantly higher forward speed (3.5\u20134.5 km\/h) than deep permanent crop operations (0.6\u20132.5 km\/h). The machine’s rotor speed, tooth count, and rotor diameter are unchanged \u2014 the depth is simply set shallower. The result is that a 1-hectare strawberry field can typically be cleared in 2\u20134 hours with the THOR 2.4 at strawberry depth, compared to 6\u201312 hours for a 1-hectare walnut orchard at caliche depth. The THOR’s versatility across this depth range makes it an extremely efficient tool for annual strawberry preparation precisely because the shallow clearing specification allows the highest possible daily coverage rate. For Korean tunnel operations where the machine must work within the tunnel structure (typically 6\u20138 m clear width between tunnel side posts), the THOR 2.4 at 2,400 mm working width fits comfortably \u2014 the THOR 3.0 at 3,000 mm typically requires removing side curtains before operation within the tunnel structure.<\/p>\n<\/details>\n

\nIs soil fumigation for strawberry still permitted in Korea and Spain, given the global phase-out of methyl bromide?<\/summary>\n

Methyl bromide was phased out under the Montreal Protocol by 2005 for most developed countries, and Korea and Spain completed their transitions in the early 2010s. Current permitted fumigants in the Korean tunnel strawberry system are: dazomet (Basamid GR, granular) \u2014 the most widely used in Korean tunnels due to its handling safety and compatibility with tunnel structures; metam sodium (applied through irrigation system); and limited-registration use of chloropicrin on some commercial operations. In Spain, 1,3-dichloropropene\/chloropicrin combination (Telone C35) is the primary commercial option for large outdoor operations in Huelva, with metam potassium as an alternative. In California, 1,3-D\/Pic is the industry standard, subject to county permit requirements and buffer zone regulations. All of these alternatives function as gases and are subject to the stone refugia problem described in Section 2 \u2014 the mode of action (gas diffusion through soil pore network) is the same for all fumigants, so the stone clearing requirement for uniform coverage applies equally to all permitted alternatives. The transition from methyl bromide has in some cases increased fumigation costs (the alternatives are more expensive per hectare) \u2014 which increases the economic incentive for stone clearing that maximises the efficacy of the more expensive alternatives.<\/p>\n<\/details>\n

\nFor Korean tunnel strawberry, does the clearing need to happen inside the erected tunnel structure or before the tunnel infrastructure is built?<\/summary>\n

Best practice in Korean tunnel strawberry stone clearing depends on where the farm is in its development cycle. For new tunnel construction: clear the field with THOR 2.4 before the tunnel hoops and side posts are installed \u2014 this provides unrestricted machine access across the full field width and is far more efficient than working within the erected structure. For established tunnels in annual rotation: the THOR 2.4 at 2,400 mm working width fits within a standard Korean single-span strawberry tunnel (6\u20138 m clear span) by making two to three passes within the tunnel bay, with the tractor entering and exiting through the tunnel end openings. This within-tunnel operation is feasible but requires careful driver management to avoid contact between the tractor or THOR frame and the tunnel arch supports. Korean agri-machinery contractors experienced in tunnel strawberry preparation have developed specific THOR operating protocols for within-tunnel use, typically involving reducing working width to 2,000 mm (adjustable within the THOR 2.4’s range) for central bay passes and making narrower passes along the side rows. For initial installation on an established farm where tunnel infrastructure prevents normal field access, the practical recommendation is to conduct within-tunnel clearing in year one, then transition to a pre-winter between-season field clearing programme that removes the plastic and old crowns before the THOR pass, ahead of the next season’s bed installation.<\/p>\n<\/details>\n

\nHow does the Botrytis grey mould risk from stone surface moisture mentioned earlier actually function \u2014 and does clearing reduce it measurably?<\/summary>\n

Botrytis cinerea (grey mould) is the primary post-harvest disease of strawberry \u2014 responsible for the greatest losses in the fresh market chain from farm to retail. Its infection of strawberry fruit requires two conditions: free moisture on fruit or flower tissue, and the presence of fungal spores in the local crop microclimate. Surface stones in the strawberry row create a specific microclimate issue: stone fragments at the soil surface or protruding into the plant canopy area hold dew and irrigation splash water for significantly longer than the surrounding mulch surface or bare soil. The moisture retention in the stone-adjacent microzone extends the daily period of high humidity in the plant’s basal leaf zone \u2014 the primary site for initial Botrytis infection that then spreads upward to developing fruit. This moisture mechanism is documented in strawberry Botrytis management literature as a reason for keeping the floor of the fruit canopy dry. On stone-cleared ground with clean raised beds and undamaged plastic mulch, the floor of the canopy is dominated by dry plastic \u2014 the stone-adjacent moisture pockets are absent. Field trial data from Korean Rural Development Administration research stations in Nonsan show consistently lower Botrytis incidence per season on stone-cleared plots versus equivalent un-cleared control plots under the same spray and ventilation management \u2014 a 15\u201325% reduction in mouldy berry percentage at harvest on the cleared plots.<\/p>\n<\/details>\n

\nIs stone clearing for Korean tunnel strawberry eligible for the MAFRA Smart Farm or rural development machinery support programme?<\/summary>\n

The Ministry of Agriculture, Food and Rural Affairs (MAFRA) and the Korea Rural Community Corporation (KRC) both operate capital machinery support programmes for agricultural equipment investment. The primary programme relevant to stone clearing for strawberry is the Agricultural Machinery Support Programme (Agricultural Machinery Support Programme), which provides co-funding for agricultural machinery purchase by registered farmers. Stone crushing and rock picking machinery has been included in the eligible equipment categories in recent programme cycles \u2014 the Korean Agricultural Machinery Industry Association (Korea Agricultural Machinery Industry Association) can confirm current eligible machinery categories and co-funding rates for the current programme cycle. Additionally, the Smart Farm Innovation Valley programme (Smart Farm Innovation Valley) supports integrated digital farming infrastructure including soil preparation equipment for tunnel crops. Confirm current eligibility with the relevant Provincial Agricultural Technology Centre (Provincial Agricultural Technology Centre) for your province. Korea Watanabe provides full Korean-language technical documentation and machinery certification materials for MAFRA programme applications.<\/p>\n<\/details>\n<\/div>\n

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Rock Crusher for Strawberry Farm \u2014 Drip Tape Depth and Fumigation Clearing Protocol<\/p>\n

Farm type (tunnel\/outdoor) + stone density survey + regional geology + tunnel width \u2192 Korea Watanabe provides the correct rock crusher for strawberry farm<\/a> specification, drip tape protection protocol and Seolhyang Brix premium ROI calculation.<\/p>\n

Korea Watanabe Rock Crusher Tractor Co., Ltd. \u2014 Ansan-si, Gyeonggi-do<\/p>\n<\/div>\n

Get Strawberry Farm Specification<\/a><\/div>\n<\/div>\n<\/div>\n

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

STRAWBERRY FARM APPLICATION Rock Crusher for Strawberry Farm \u2014 Korea Spain and Chile Guide At 8 cm \u2014 shallower than any root system in this guide \u2014 a stone ends a season before the first fruit forms. 8\u201312 cm Drip tape depth 3\u00d7 Seolhyang Brix premium Same season ROI payback period Strawberry Farm Consultation Every […]<\/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-1031","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts\/1031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/comments?post=1031"}],"version-history":[{"count":1,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts\/1031\/revisions"}],"predecessor-version":[{"id":1036,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts\/1031\/revisions\/1036"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/media?parent=1031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/categories?post=1031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/tags?post=1031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}