OT_208: Mason (2012), Cold Storage Options for Small-Scale Diversified Farms in the Northeast

OT_208: Mason (2012), Cold Storage Options for Small-Scale Diversified Farms in the Northeast

Source

https://blog.uvm.edu/cwcallah/crop-storage-resources/ — original source (opens in a new tab; the file is not redistributed)

Summary

A qualitative field-survey report by Garland Mason (Green Mountain College Farm & Food Project, December 2012) documenting how small-scale diversified vegetable farms in the US Northeast build and run winter cold-storage systems. Mason visited 11 named farms plus 2 storage sites across Vermont, Massachusetts and eastern New York in March 2012 and describes cooler construction options (pre-fab boxes, stressed-skin/SIP panels, recycled panels, spray-foam envelopes, retrofit shipping containers), the storage zones different crops need, and practical considerations (washing/packing, air circulation, Cool-bots, Free-Aire cold-air economizers, passive stovepipe rooms, pest control, storage-bred varieties).

For the Neobiome project (D02 smart food systems) its value is a transferable practitioner picture of community-/small-farm winter food storage, not a source of hard NZ figures. The concrete, verbatim data it carries are: the four storage-zone temperature/RH bands used to design cooler space (cold & wet, cool & moist, warm & dry, cool & dry — Mason citing a Whole Farm Services fact sheet) OT_208; a potato curing protocol (50-60 °F, ~95 % RH, 10-14 days — Mason citing Yanta) OT_208; and a measured long-storage case for carrots (least staining after six months of cold storage while retaining marketable crunchiness/sweetness — Jericho Settlers Farm 2010 study, cited by Mason) OT_208. It also fixes the Cool-bot small-cooler technology boundary (not recommended much beyond ~1,100 cubic feet ≈ 31 m³) OT_208, directly relevant to sizing a community-scale store. Data quality is medium — grey literature, qualitative, US Northeast, with most numbers reported from secondary field-guide sources within the narrative.

Key claims

- claim: "FIELD-SURVEY SCOPE (qualitative, 12 farms). Verbatim (§I Introduction): 'In March of 2012, I had the opportunity to visit six farms in Vermont, four in Massachusetts and two in eastern New York, each with innovative and varied storage infrastructure. In Vermont, I also visited Deep Root Cooperative's storage site and the Vermont Food Venture Center.' → 12 farms (6 VT / 4 MA / 2 NY) plus 2 storage sites. The study is QUALITATIVE (a narrative of observed practice; no quantitative sample design). ⚠ The §IX 'Farms Visited' appendix names only 11 farms (5 VT), a minor internal count discrepancy — the Introduction's 6-VT/12-farm statement is the retrieval-verified figure. [verified verbatim against the raw]"
  source_location: "Mason (2012), §I Introduction (PDF footer p.13); farm list §IX Farms & Other Sites Visited (PDF footer p.30)."
- claim: "FOUR STORAGE ZONES — temperature/RH design bands (Mason citing Whole Farm Services fact sheet). Verbatim (§III): 'There are four commonly identified storage zones for crops grown in the northeast. They include cold & wet (e.g. root storage) which ranges from 32-40° Fahrenheit and 90-95% relative humidity (RH), cool and moist (e.g. potato storage), 38-40°F and 80-90% RH, warm and dry (e.g. squash storage) which requires 50-60°F and 50-70% RH, and cool and dry (e.g. onion storage), 40-50°F and 60-70% RH (Fact Sheet, Whole Farm Services).' ORIGIN: attributed to a Whole Farm Services fact sheet; Mason carries it as a field-guide summary — the authoritative per-crop conditions are USDA Agriculture Handbook 66 (which Mason itself points readers to, §III). ⚠ Mason's §III body then details SIX zones (adds Very Cold & Dry 32-38°F/60-70% for sweet potatoes, and Very Cold & Moist 32-38°F/80-90% for brassicas); and the §III.B sub-header misprints cool-&-moist as 50-60°F/50-70% (the intended potato band is 38-40°F/80-90%, per the intro + §III.B body). [verified verbatim against the raw]"
  source_location: "Mason (2012), §III The Storage Zones, intro paragraph (PDF footer p.17); six-zone detail §III.A-F (PDF footer pp.17-20)."
- claim: "POTATO CURING PROTOCOL (Mason citing Yanta). Verbatim (§III.B Cool & Moist Storage): 'Potatoes should be cured at 50-60 degrees Fahrenheit with about 95% humidity for 10 to 14 days (Yanta).' Optimal post-cure potato storage is stated as 38-40 °F and 80-90% humidity (Whole Farm Services). NOTE: this is a CURING duration (10-14 days), NOT a storage-life month figure — Mason states no potato storage-duration month range. ORIGIN: attributed to Yanta & Tong (Univ. of Minnesota Extension), cited by Mason. [verified verbatim against the raw]"
  source_location: "Mason (2012), §III.B Cool & Moist Storage (e.g. Potato Storage) (PDF footer p.18)."
- claim: "CARROTS — MEASURED SIX-MONTH LONG-STORAGE CASE (Jericho Settlers Farm 2010 study, cited by Mason). Verbatim (§IV.A Washing & Packing): 'In 2010, Jericho Settlers Farm completed a study that examined the correlation between carrot staining and washing and storing methods. The study showed that carrots harvested and washed same day, put into cold storage immediately after washing had the least amount of staining after six-months of storage while maintaining marketable quality based on crunchiness and sweetness (Alexander).' The '6 months' is the study's measurement horizon at which carrots retained marketable quality (least staining), i.e. a demonstrated long-storage duration for carrots in cold storage — NOT a generic '4-6 month' figure for all winter crops. ORIGIN: Jericho Settlers Farm 2010 on-farm study, cited by Mason as '(Alexander)' (Alexander, C., NOFA-VT summary report). [verified verbatim against the raw]"
  source_location: "Mason (2012), §IV.A Washing & Packing (PDF footer p.21); source cited = Alexander, C. (2010), NOFA-VT (Sources Cited, PDF footer p.26)."

Neobiome Intelligence relevance

Feeds D02 (smart food systems) as the transferable small-farm / community winter cold-storage practice source. Concretely:

1. Storage-zone setpoint bands for cooler design. The four zone bands — cold & wet 32-40 °F / 90-95 % RH (root crops), cool & moist 38-40 °F / 80-90 % RH (potato), warm & dry 50-60 °F / 50-70 % RH (squash), cool & dry 40-50 °F / 60-70 % RH (onion) OT_208 — are the practical target conditions a community store must hold, and they show that a single cooler cannot serve every crop (why farms combine zones or accept sub-optimal storage for tolerant crops like potatoes/onions). Use as a field-guide design frame; take the authoritative per-crop temperature/RH/shelf-life numbers from USDA Handbook 66 / Cornell (the sibling primaries in this batch), which Mason itself defers to.
2. Carrots as a demonstrated long-storage crop. The Jericho Settlers 2010 case gives a measured six-month cold-storage duration for carrots at retained marketable quality OT_208 — a concrete data point for how long a root staple can be held, and evidence that harvest/wash timing (same-day wash → immediate cold storage) drives storage quality.
3. Potato curing step. 50-60 °F, ~95 % RH, 10-14 days curing before cold storage OT_208 — a post-harvest handling parameter (distinct from storage duration) that the food model can carry as the potato conditioning requirement.
4. Technology boundary for community-scale stores — the Cool-bot. Mason states Cool-bots (a device that overrides a standard air-conditioner’s thermostat to reach cooler temperatures) are a cost-effective evaporator/compressor replacement in small coolers less than ~1,100 cubic feet (≈ 31 m³) and are “not recommended for space much larger than 1100 cubic feet” OT_208 (§III.B, PDF p.18; §IV.B Cooler Considerations, PDF p.23). This is the size threshold below which a low-cost Cool-bot suits, and above which a conventional refrigeration system is needed — directly relevant when sizing/costing a remote-community cold store.
5. Low-electricity storage options (off-grid relevance). Mason documents passive/low-energy approaches: a passive potato room using stovepipes to exhaust warm air and draw in cold (Blackwell Roots), and the Free-Aire “cold-air economizer” that pulls in cold winter outside air to hold cooler temperature and cut energy cost (§IV.B, PDF p.22-23). These matter for grid-less/off-grid communities where minimising refrigeration electricity is a design driver, though both depend on a cold-winter climate.

Boundary / caveats. US Northeast (New England) context — winter-storage patterns and practices transfer, the climate-specific tricks (passive cold-air rooms, Free-Aire) assume cold winters, and the numbers are field-guide/secondary values within a qualitative narrative. Do not use Mason for a hard NZ model cell. Explicitly: the “4 to 6 month storage duration” figure some downstream synthesis attributes to Mason is not in this source — Mason gives winter storage qualitatively and states no such month-range; only the carrots-six-month case is a verbatim duration.

Underlying / related sources

• Alexander, C. (2010) — Summary Report for Season Extension and Winter-Growing On-Farm Research: Winter Carrot Storage Techniques (NOFA-Vermont), the Jericho Settlers Farm study behind the carrots-six-month figure. Recorded for provenance; not raised as a new RT (minimise-new-RTs) — the six-month figure is already captured verbatim via Mason.
• Yanta, J.P. & Tong, C. (2012) — Commercial Post-Harvest Handling of Potatoes (Univ. of Minnesota Extension), origin of the 50-60 °F / 10-14 day potato curing figure Mason carries.
• USDA Agriculture Handbook 66 — The Commercial Storage of Fruits, Vegetables, and Florist and Nursery Stocks — the authoritative per-crop storage-conditions reference Mason defers to (§III). Held separately as OT_209.
• Whole Farm Services (fact sheet) — the field-guide source of Mason’s four storage-zone temperature/RH bands.

Notes

• Verified against the raw. All four key_claims were read verbatim from the PDF (20 pp) with exact section + PDF-footer-page source_location. The sha256 (44e0d3d0…) is of the single-file PDF and matches the raw.
• Pagination. PDF footer prints 11-30 (this is an excerpt of a larger compilation); the document’s own ToC uses internal page numbers (Introduction=3 … Farms Visited=20; footer = internal + 10). Citations give the PDF footer page for locatability.
• Internal inconsistencies (flagged, not resolved). (1) §III intro says “four … storage zones” but §III body describes six (A-F). (2) §III.B “Cool & Moist” sub-header prints 50-60 °F / 50-70 % RH, which contradicts the intro and the §III.B body (38-40 °F / 80-90 % RH for potato) — reads as a copy-paste of the §III.C Warm & Dry values; the 38-40 °F / 80-90 % band is the intended potato figure. (3) Intro states “six farms in Vermont” (12 total) but §IX lists 11 named farms (5 VT).
• Downstream-synthesis flag. The “4 to 6 month storage duration” is an interpolation added by a downstream compiled-research synthesis, not a Mason figure — recorded here so the number is never back-attributed to this source. Mason’s only verbatim duration is carrots six months.
• Authoritative first-party PDF (Green Mountain College report).

Research targets

Documents to retrieve

• Alexander (2010) NOFA-VT winter-carrot storage study and Yanta & Tong (2012) UMN potato post-harvest — the underlying primaries for the carrots-six-month and potato-curing figures. Recorded, not raised as new targets: both figures are already captured verbatim via Mason; retrieving the originals would add methodological detail only, not a new headline number.

Research gaps

• NZ winter-storage duration / cold-store sizing for community-scale root & brassica crops. Mason is US-Northeast and qualitative; the NZ-specific storage-life and cold-store load figures come from the sibling coolstore primaries (apple/kiwifruit anchors, USDA HB66 for per-crop conditions). Recorded as a modelling note rather than a new target — no NZ-specific gap is uniquely opened by this source.

Connections

Links to

Sources (1): OT_209

Referenced by

EDT domains (1): D02: Smart Food Systems & Agriculture