{"id":743,"date":"2026-05-27T08:33:40","date_gmt":"2026-05-27T08:33:40","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=743"},"modified":"2026-05-27T08:33:40","modified_gmt":"2026-05-27T08:33:40","slug":"korean-highland-potato-cold-storage-guide-grade-1-preservation","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/nl\/korean-highland-potato-cold-storage-guide-grade-1-preservation\/","title":{"rendered":"Korean Highland Potato Cold Storage \u2014 Complete Guide to Post-Harvest Storage Management for Grade 1 Preservation"},"content":{"rendered":"
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Korean Highland Potato Cold Storage \u2014 Complete Guide to Post-Harvest Management for Grade 1 Preservation and Market Timing<\/h1>\n

Every quality decision made in the field \u2014 stone clearing, hilling, harvest speed \u2014 can be undone in a poorly managed storage room. Korean highland potato cold storage is where Grade 1 is preserved or lost in the weeks and months between harvest and market.<\/p>\n

Consultatie over het Highland Potato System<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

The Korean highland potato production system from this series \u2014 stone clearing with the THOR 2.4 steenbreker<\/a>, fine tilth from the PSW-3200, careful harvest with the EP-AWB-1600 aardappelrooier<\/a> \u2014 exists to produce Grade 1 tubers that reach the market in prime condition. All of this investment is exposed to a single management risk after harvest: cold storage. A potato crop that arrives at storage as 85% Grade 1 can leave storage 4 months later at 60% Grade 1 if storage conditions are mismanaged \u2014 not because of disease but because of preventable physiology-driven quality changes that correct storage management stops.<\/p>\n

This guide covers the complete Korean highland potato cold storage management sequence: the wound-healing period that must precede refrigeration, the variety-specific temperature and humidity zones that maintain Grade 1 quality through the storage period, cold-induced sweetening (CIS) prevention for Atlantic crisp-processing varieties, dormancy management for Dubaek premium winter release, and the February market timing decisions that determine when to move stored potato to market for maximum price capture.<\/p>\n

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Wound Healing Before Refrigeration \u2014 The Non-Negotiable First Step<\/h2>\n

\"Korean<\/p>\n

Every harvested Korean highland potato arrives at storage with mechanical wounds \u2014 minor skin abrasions from the EP-AWB-1600 web separator, cut surfaces from EP-AWB-1600 share contact on the rare occasions when the share clips a tuber, and small pressure bruises from handling. These wounds must heal before refrigeration begins. The healing mechanism is suberisation \u2014 the formation of a corky wound periderm layer (suberin) over damaged surfaces that seals the wound against moisture loss and pathogen entry. The suberisation process requires specific conditions that are incompatible with refrigeration temperatures:<\/p>\n

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Suberisation (wound healing) requirements<\/p>\n

\n
\n
14\u201318\u00b0C<\/div>\n
Temperature range
\n(optimum 15\u201316\u00b0C)<\/div>\n<\/div>\n
\n
90\u201395%<\/div>\n
Relatieve luchtvochtigheid
\n(high moisture essential)<\/div>\n<\/div>\n
\n
10\u201314 days<\/div>\n
Duration at 15\u00b0C
\n(longer at lower temp)<\/div>\n<\/div>\n
\n
Dark<\/div>\n
No light exposure
\n(prevents greening)<\/div>\n<\/div>\n<\/div>\n<\/div>\n

In Korean highland August conditions (ambient temperature typically 20\u201325\u00b0C at 600 m), freshly harvested potatoes placed in a dark, ventilated storage room naturally experience suberisation conditions without active cooling. The wound healing period should be completed before any cooling is applied \u2014 typically 10\u201314 days after harvest before the cold storage temperature is reduced to the long-term storage target. Farmers who immediately refrigerate freshly harvested potatoes (a common mistake driven by concern about heat damage) interrupt suberisation \u2014 producing storage lots where wound surfaces remain open, increasing moisture loss and infection entry points throughout the cold storage period.<\/p>\n

<\/p>\n

Variety-Specific Temperature Zones \u2014 Why Each Variety Needs Different Settings<\/h2>\n

\"Korean<\/p>\n

The four Korean highland potato varieties have different physiological responses to cold storage temperature \u2014 and a single temperature setting for all varieties in a mixed storage room will inevitably mismanage at least one variety. Understanding why each variety requires different temperature targets prevents the most common Korean highland cold storage quality losses:<\/p>\n

\n
\n
Sumi \u2014 Fresh Market Standard<\/span>
\nTarget: 3\u20135\u00b0C \/ 90\u201395% RH<\/span><\/div>\n

Sumi has moderate cold tolerance \u2014 storage at 3\u20135\u00b0C maintains dormancy effectively for 3\u20135 months without CIS development. Below 3\u00b0C, chilling injury can occur (internal browning in tuber flesh) in Sumi under Korean highland conditions where natural cell membrane resilience is moderate. Maintain humidity at 90\u201395% \u2014 below 85% RH at this temperature causes weight loss (shrinkage) that reduces turgidity and fresh appearance at market, directly affecting Grade 1 classification for fresh market.<\/p>\n<\/div>\n

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Atlantic \u2014 Processing Crisp Supply<\/span>
\nTarget: 8\u201310\u00b0C \/ 90\u201395% RH \u2014 CRITICAL<\/span><\/div>\n

Atlantic is the most temperature-sensitive variety in Korean cold storage \u2014 cold-induced sweetening (CIS) develops rapidly below 8\u00b0C. When Atlantic is stored below 8\u00b0C, the starch-to-sugar conversion accelerates, increasing reducing sugar content in the tuber. During frying, these reducing sugars react with amino acids (Maillard reaction) to produce dark brown discolouration in the fried crisp \u2014 a quality failure that Korean crisp manufacturers detect at intake using colorimetric testing. A single week of Atlantic stored at 5\u00b0C rather than 9\u00b0C can produce CIS levels that fail the colour specification. Atlantic must never share a storage room with Sumi or Dubaek if those varieties are stored at 3\u20135\u00b0C.<\/p>\n<\/div>\n

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Dubaek \u2014 Extended Storage Premium<\/span>
\nTarget: 3\u20135\u00b0C \/ 90\u201395% RH for 6+ months<\/span><\/div>\n

Dubaek is the most CIS-resistant of the four Korean highland varieties \u2014 its low CIS sensitivity allows storage at 3\u00b0C without sweetening risk. This CIS tolerance is what makes Dubaek the only variety suitable for 6-month-plus cold storage targeting the December\u2013February premium market window. Storage at consistent 3\u20134\u00b0C from September through January maintains Dubaek dormancy through this extended period, arriving at market in January\u2013February with full turgidity, clean skin, and the cooking quality that commands the winter premium.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Cold-Induced Sweetening \u2014 The Chemistry Korean Atlantic Growers Must Understand<\/h2>\n

Cold-induced sweetening (CIS) is the most commercially damaging storage defect for Korean Atlantic crisp-supply growers. Understanding the biochemistry helps explain why temperature discipline is non-negotiable for Atlantic, and why the 8\u00b0C lower limit is not conservative but scientifically determined:<\/p>\n

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The starch-sugar balance:<\/span><\/p>\n

At temperatures above 8\u00b0C, potato tubers maintain a metabolic balance that keeps starch as the dominant carbohydrate \u2014 the high dry matter, low reducing sugar condition that produces pale, uniform fried crisps. Below 8\u00b0C, a temperature-sensitive enzyme system (amylase pathway) shifts the equilibrium, converting starch to glucose and fructose (reducing sugars) faster than the reverse pathway converts them back to starch. The accumulation of reducing sugars in the tuber tissue is CIS \u2014 and it is irreversible once it has occurred.<\/p>\n<\/div>\n

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Reconditioning:<\/span><\/p>\n

If Atlantic has been inadvertently stored below 8\u00b0C and CIS has developed, partial reconditioning is possible by raising storage temperature to 15\u201318\u00b0C for 2\u20133 weeks before processing delivery \u2014 the higher temperature reverses some of the starch-sugar conversion, reducing but not eliminating the CIS-elevated reducing sugar content. Reconditioning is a corrective measure, not a prevention strategy \u2014 it restores partial quality but cannot return a severely sweetened lot to full specification. Correct temperature maintenance is always the better answer.<\/p>\n<\/div>\n

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Manufacturer intake testing:<\/span><\/p>\n

Korean crisp manufacturers (Lotte, Orion, Nongshim) test incoming Atlantic deliveries for reducing sugar content using colorimetric methods \u2014 either the Kubelka-Munk colour measurement of test fry samples or direct reducing sugar assay of tissue samples. A lot that fails this test cannot be upgraded by reconditioning after intake rejection \u2014 the lot is returned or purchased at a heavy discount for alternative markets. Testing your Atlantic from storage before delivery (either through a registered agricultural testing laboratory or through the same test-fry method: oil at 175\u00b0C, 60-second fry, assess colour against the standard chart) prevents the delivery of CIS-affected Atlantic and the relationship damage with the processing buyer.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Humidity Management \u2014 Preventing Weight Loss Without Causing Condensation<\/h2>\n

\"Korean<\/p>\n

Cold storage humidity management is a balance between two failure modes: too low humidity causes tuber weight loss (shrinkage) that reduces fresh appearance and turgidity; too high humidity or inadequate air circulation causes condensation on tuber surfaces that triggers soft rot and Fusarium development. The 90\u201395% RH target zone sits between these failure modes \u2014 high enough to prevent significant transpiration weight loss, low enough that condensation does not occur on well-circulated tuber surfaces.<\/p>\n

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Below 85% RH \u2014 weight loss failure<\/p>\n

At 3\u20135\u00b0C and below 85% RH, Korean highland potato tubers (relatively thin-skinned varieties like Sumi) lose 2\u20134% body weight per month through transpiration. At 3 months storage, a 3% weight loss per month means the lot is 9% lighter than at harvest \u2014 with visible skin wrinkling on grade-sensitive surface areas. Fresh market buyers detect turgidity loss at the point of sale, resulting in Grade 1 downgrade or return of consignment.<\/p>\n<\/div>\n

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Above 97% RH \u2014 condensation failure<\/p>\n

At above 97% RH or with inadequate air circulation, free moisture condenses on the coldest surfaces in the storage room \u2014 typically the tubers nearest the air intake. This surface moisture provides the conditions for soft rot bacteria (Pectobacterium) to infect surface wounds from the harvest process. A single condensation event on a lot with existing harvest bruise wounds can initiate wet rot lesions that spread to adjacent tubers through direct contact, potentially destroying 10\u201320% of a storage lot within 2 weeks.<\/p>\n<\/div>\n

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90\u201395% RH with good circulation \u2014 correct<\/p>\n

The 90\u201395% target zone with low-velocity air circulation (0.2\u20130.5 m\/s across the tuber pile) maintains adequate humidity around tubers without creating stagnant pockets where condensation accumulates. In Korean highland cold storage facilities, a simple evaporative humidifier or water tray plus ventilation fan achieves this target more reliably than relying on the refrigeration system’s inherent humidity output, which is typically too dry for potato storage without supplementary humidification.<\/p>\n<\/div>\n<\/div>\n

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Storage Monitoring Schedule \u2014 Weekly Checks That Prevent Major Losses<\/h2>\n

Korean highland potato cold storage requires active monitoring \u2014 a storage facility set to the correct parameters in September and not checked again until February will have experienced undetected equipment failures, pest entry, and rot spread that cannot be corrected retroactively. The following minimum monitoring schedule prevents major losses while requiring only a modest time investment per week:<\/p>\n

\n\n\n\n\n\n\n\n\n
Frequency<\/th>\nCheck<\/th>\nAlert threshold \u2014 act immediately if exceeded<\/th>\n<\/tr>\n<\/thead>\n
Daily (automated)<\/td>\nData logger temperature and humidity reading at 3 positions in the storage room<\/td>\nTemperature above target +2\u00b0C for more than 4 hours; humidity below 85% or above 97% for more than 12 hours<\/td>\n<\/tr>\n
Weekly (visual)<\/td>\nWalk the storage room and inspect tuber pile surface for: condensation on surface tubers; soft rot lesions (wet, collapsing tuber tissue); sprout emergence; rodent activity<\/td>\nAny wet rot lesion visible \u2014 isolate affected section immediately. Any sprouting in Sumi or Daejima before December \u2014 check temperature (may be too high)<\/td>\n<\/tr>\n
Monthly<\/td>\nCore sample of 20 tubers from the bottom of the pile: measure weight loss vs recorded harvest weight; inspect for internal browning (chilling injury); test-fry Atlantic sample for colour assessment<\/td>\nWeight loss above 2% per month: raise humidity. Internal browning in non-Atlantic varieties: raise temperature 1\u20132\u00b0C. Atlantic test fry darker than specification: begin reconditioning<\/td>\n<\/tr>\n
Equipment (monthly)<\/td>\nRefrigeration compressor operating pressure; condenser coil frost build-up; evaporator fan function; humidity control system calibration<\/td>\nAny refrigeration equipment sign of reduced performance \u2014 contact service provider. Prevention service before the storage season (August) is more reliable than reactive repair in November<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Market Timing \u2014 When to Move Stored Potato for Maximum Price<\/h2>\n

\"Korean<\/p>\n

The entire cold storage investment is justified by one commercial outcome: selling highland potato at a higher price than the August harvest price that non-storing Korean farmers accept. Understanding the Korean highland potato price calendar \u2014 and the specific windows when stored supply commands a premium \u2014 determines when to release from cold storage:<\/p>\n

\n
\n

August\u2013September:<\/span><\/p>\n

Harvest price (baseline).<\/strong> All Korean highland farms are harvesting simultaneously \u2014 supply is maximum and price is at or near the season’s lowest point for fresh market. Farms without cold storage must sell at this price. Farms with cold storage enter at this point and hold.<\/p>\n<\/div>\n

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October\u2013November:<\/span><\/p>\n

First price improvement (+15\u201325% vs harvest).<\/strong> Highland supply is exhausted for farms without storage. Only stored and imported supply remains. First price recovery. Farms with low storage capacity or Daejima (short dormancy) may release at this point \u2014 accepting the first improvement rather than holding for the February peak.<\/p>\n<\/div>\n

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December\u2013January:<\/span><\/p>\n

Strong premium (+30\u201350% vs harvest).<\/strong> Korean fresh potato supply becomes tight as stored highland supply is gradually depleted and domestic off-season supply from southern regions has not yet arrived. Sumi stored to this point commands strong premiums. Begin releasing Sumi and Daejima stored in good condition.<\/p>\n<\/div>\n

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Januari-februari:<\/span><\/p>\n

Peak premium for Dubaek (+50\u201380% vs harvest).<\/strong> The January\u2013February window is the highest-price period of the Korean highland potato market calendar. Supply of high-quality Dubaek (the only variety with the dormancy to hold this long without sprouting) commands the largest premium of the season. The 4-month cold storage investment for Dubaek is justified by capturing this February premium \u2014 the single highest value capture opportunity in the entire Korean highland potato production calendar.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

How Stone Clearing Quality Affects Cold Storage Outcomes<\/h2>\n

The connection between the aardappelmachinesysteem<\/a> field quality and cold storage outcomes runs through tuber skin integrity at harvest. Tubers that enter storage with more harvest wounds (from stone-contact bruising and skin abrasion in the EP-AWB-1600 zone on un-cleared fields) have more entry points for soft rot pathogens throughout the storage period \u2014 regardless of how well temperature and humidity are managed. The storage investment compounds the field investment:<\/p>\n

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\n

Stone-cleared harvest: storage advantage<\/p>\n

Tubers from stone-cleared fields arrive at storage with minimal harvest wounds \u2014 mostly minor skin abrasions from normal web separator contact. During the 10\u201314 day suberisation period, these minor abrasions fully heal before the storage temperature is dropped. The storage period from September to February proceeds with a low-wound, well-healed tuber population where soft rot entry points are minimal. Grade 1 proportion at February market closely mirrors Grade 1 proportion at harvest \u2014 storage quality is preserved.<\/p>\n<\/div>\n

\n

Un-cleared harvest: storage disadvantage<\/p>\n

Tubers from un-cleared fields arrive with more severe harvest wounds \u2014 stone-contact skin abrasions and bruise sites where share deflection threw tubers against stones in the web zone. The suberisation period heals surface abrasions but cannot fully heal deep bruise sites where the parenchyma tissue is damaged below the skin layer. These unhealed bruise zones become the primary soft rot entry points during the storage period \u2014 gradually expanding into internal rot lesions that produce storage losses in November\u2013January that are invisible at harvest in August.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Veelgestelde vragen<\/h2>\n
\n
\nCan different potato varieties be stored in the same cold storage room?<\/summary>\n

Mixing Sumi, Dubaek, and Daejima in the same room at 3\u20135\u00b0C is technically manageable \u2014 all three tolerate this temperature zone. The critical separation requirement is Atlantic: Atlantic must be stored separately from other varieties at 8\u201310\u00b0C. If your storage facility has only one temperature zone, you must choose between Atlantic (8\u201310\u00b0C, correct for processing but sub-optimal for fresh market varieties above this temperature) or fresh market varieties (3\u20135\u00b0C, correct but CIS-inducing for Atlantic). For farms growing both Atlantic and fresh market varieties, the practical solution is separate insulated storage zones within the same building \u2014 each section with independent temperature control. The zone divider can be a simple insulated partition. The capital cost of the partition is recovered in a single Atlantic storage season through prevention of one CIS rejection event.<\/p>\n<\/details>\n

\nWhat happens to Dubaek that stays in storage beyond February?<\/summary>\n

Dubaek’s 6\u20138 month dormancy at 3\u20134\u00b0C means that tubers correctly stored from September typically show the first meaningful sprout emergence in March\u2013April (7 months after harvest). Sprouting does not make the tuber inedible or unsaleable, but visible sprout emergence at the tuber eye causes Korean fresh market Grade 1 to downgrade to Grade 2 (market expectation: no visible sprouting at point of sale). For Dubaek held beyond February, monitor sprout emergence weekly from early February and plan to complete market release before visible sprout lengths reach 3\u20135 mm at the eye surface. Sprout suppression with approved post-harvest sprouting inhibitor (ethylene gas treatment in approved storage facilities in Korea) can extend the sprout-free period by 4\u20138 weeks if market conditions warrant holding beyond February. Confirm current Korean registration status of any sprout suppression treatment before use.<\/p>\n<\/details>\n

\nIs a commercial refrigeration system necessary or can ambient cold storage work for Korean highland farms?<\/summary>\n

At Korean highland altitudes above 600 m, ambient temperatures in November\u2013January naturally fall into the 0\u20135\u00b0C range \u2014 close to the fresh market storage target of 3\u20135\u00b0C. Semi-underground or earth-sheltered storage structures (traditional Korean potato storage design) use this natural cold and the earth’s thermal mass to maintain temperatures in the 3\u20137\u00b0C range without mechanical refrigeration. This ambient cold storage approach is viable for Sumi and Dubaek fresh market supply held to November\u2013January. Its limitations: (1) temperature is not controllable \u2014 an unusually warm Korean winter can push ambient storage above 8\u00b0C for extended periods, causing premature dormancy break and sprouting; (2) it is not suitable for Atlantic, which requires precisely maintained 8\u201310\u00b0C that ambient storage cannot provide in the variable Korean highland winter; (3) it does not provide humidity control \u2014 ambient humidity management requires supplementary means. Mechanical refrigeration with independent temperature and humidity control is the investment that enables reliable Dubaek February market release and Atlantic processing supply without the risk of uncontrolled ambient temperature excursions.<\/p>\n<\/details>\n

\nHow much does harvest bruising from stone-impacted fields affect storage loss rates compared to clear fields?<\/summary>\n

Korean highland storage trials comparing stone-cleared and un-cleared field harvest lots consistently show that un-cleared field harvest produces 15\u201330% higher storage loss rates (percentage of stored tubers lost to rot and quality decline during the storage period) compared to stone-cleared field harvest stored under identical conditions for equivalent periods. This storage loss differential grows with storage duration \u2014 it is small at 6 weeks (minor difference) but large at 20 weeks (major difference), because the soft rot entry points from harvest bruising in un-cleared fields have more time to expand into measurable internal rot cavities. For farms holding Dubaek to February (20-week storage), the harvest bruising from un-cleared fields can translate to a 20\u201330% reduction in saleable Grade 1 lots reaching the February market \u2014 directly eroding the premium that the 20-week storage investment was designed to capture.<\/p>\n<\/details>\n

\nAre Korean cold storage facilities eligible for government support programs?<\/summary>\n

Yes \u2014 Korean agricultural cold storage facility construction and renovation is eligible under the Korea Rural Community Corporation (KRCC) agricultural infrastructure support program (nongop gibansi-seol jeongbisaeopbi jiwon) which funds storage facilities as part of post-harvest loss reduction infrastructure. The program covers construction, insulation upgrade, refrigeration equipment, and humidity control installation at 30\u201350% grant contribution on approved projects. Storage capacity requirements (typically minimum 30 tonnes to qualify for individual farm applications) apply \u2014 smaller farms may access the program through cooperative storage applications that aggregate multiple farms’ storage capacity requirements into a single qualifying project. Contact the local county RDA office or KRCC regional office for current application guidelines and project specifications for agricultural cold storage support in your county.<\/p>\n<\/details>\n<\/div>\n

<\/p>\n

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Complete Highland Potato System \u2014 Field Quality That Cold Storage Can Preserve<\/p>\n

Variety mix + storage duration target + current harvest bruising rate \u2192 system recommendation connecting THOR 2.4 field clearance to EP-AWB-1600 harvest settings to storage temperature protocol. Korea Watanabe, Ansan-si, Gyeonggi-do.<\/p>\n

Neem nu contact met ons op<\/a><\/p>\n<\/div>\n

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

Korean Highland Potato Cold Storage \u2014 Complete Guide to Post-Harvest Management for Grade 1 Preservation and Market Timing Every quality decision made in the field \u2014 stone clearing, hilling, harvest speed \u2014 can be undone in a poorly managed storage room. Korean highland potato cold storage is where Grade 1 is preserved or lost in […]<\/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-743","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\/743","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=743"}],"version-history":[{"count":1,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts\/743\/revisions"}],"predecessor-version":[{"id":745,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/posts\/743\/revisions\/745"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/media?parent=743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/categories?post=743"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/nl\/wp-json\/wp\/v2\/tags?post=743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}