Post-Harvest Series: Roots & Tubers — Post-Harvest & Processing

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Published by Kilimokwanza.org | Region: Kenya, Tanzania, Uganda, Rwanda, Burundi | Crops covered: Sweet potato (including OFSP), Cassava, Yam

Editor’s introduction

This Issue is the fifth instalment of the Kilimokwanza Post-Harvest & Processing Series. Where Issue 1 (Cereals) anchored the drying discipline, Issue 2 (Legumes) anchored the bruchid-and-aflatoxin disciplines, Issue 3 (Oilseeds) anchored the cooking-oil-import-substitution framing, and Issue 4 (Cash Crops) anchored the wet-versus-dry-process quality differentiation, Issue 5 (Roots & Tubers) anchors a fundamentally different post-harvest discipline framework: tuber-and-root crops carry unique safety, curing, perishability, and processing-infrastructure requirements unlike any other regional crop category.

This Issue covers the three root-and-tuber crops that anchored Seed Series Issue 6: sweet potato (with the OFSP value-add story finally getting the editorial treatment that the AIF Rwanda model warrants), cassava (with the structural cyanide-management discipline plus the emerging high-quality cassava flour commercial trajectory), and yam (the cultural-staple-emerging-into-commercial crop with the West African yam-barn storage tradition adaptable to regional production zones). The Issue is shorter than previous Issues by crop count (three crops versus six-to-eight) but carries comparable editorial depth due to the structural complexity of root-and-tuber post-harvest.

Three structural through-lines connect the three crops. First, the safety question: cassava cyanide management is the defining post-harvest discipline (covered in this Issue’s upfront pull-out box) with structural public-health implications across the region. Second, the perishability gradient: cassava (24–72 hour deterioration) sits at one extreme, sweet potato (4–6 months with proper curing) at the other, with yam (4–6 months with proper curing-and-storage architecture) intermediate. Third, the value-add infrastructure question: AIF Rwanda’s OFSP puree model (covered in this Issue’s sweet-potato pull-out box) provides the regional commercial-development reference that the cassava-flour and yam-flour categories have not yet reached — representing the structural commercial-development opportunity for the category.

The three roots & tubers at a glance

Read across: the loss-range column tells the structural perishability story. Cassava sits at 20–50% (the highest of any regional crop, driven by 24–72 hour fresh-root deterioration); sweet potato at 20–40% (driven by curing-discipline gaps); yam at 15–30% (the lowest of the three, reflecting moderate perishability and traditional storage architecture). The curing column anchors the foundational discipline: cassava is uniquely non-curable and requires rapid processing; sweet potato and yam both reward 4–7 day and 1–2 week curing protocols respectively. The lead-market column traces commercial proposition: bio-fortified domestic for OFSP, composite-flour-and-industrial for cassava, community-market-and-premium-niche for yam.

Why this matters

Sweet potato carries the regional bio-fortification flagship story. Beyond its role as a staple food crop across all five East African countries, the orange-fleshed sweet potato (OFSP) variety class — anchored by the CIP-Nairobi-and-HarvestPlus partnership documented at length in Seed Series Issue 6 — has become the regional reference success story for vitamin-A bio-fortified food, with structural commercial trajectory through 2024–2026 reaching school-feeding integration, premium baby-food formulation, and emerging commercial bakery applications.

Sweet potato post-harvest economics are dominated by two structural disciplines: curing (the 4–7-day post-harvest skin-hardening process that determines whether storage life is 2 weeks or 4–6 months) and processing-and-value-add infrastructure (which determines whether the crop’s nutritional value reaches consumers as premium retail product or as commodity-grade fresh root). The curing discipline is the most empirically documented post-harvest intervention for sweet potato; the value-add infrastructure is the regional commercial-development trajectory anchored by Africa Improved Foods (AIF Rwanda), Sasini, Smart Logistics Solutions, and emerging Kenyan-Tanzanian-Ugandan commercial operators.

The post-harvest landscape: lifting, curing, storage

• Lifting / harvesting: Hand-lifting at smallholder scale (the dominant regional practice); mechanical harvesting at large-commercial scale. Damage during lifting (cuts, bruises, breakage) reduces curing outcomes and storage life dramatically.

• Curing (the foundational discipline): Sweet potato roots cured for 4–7 days at 28–32°C and 85–95% relative humidity to harden skin and heal lifting wounds. Curing extends storage life from 2 weeks (uncured roots) to 4–6 months (properly cured roots). Smallholder curing: traditional in-field heap covered with straw and soil; cooperative scale: dedicated curing rooms with humidity-and-temperature control; commercial scale: integrated curing-cold-storage facilities.

• Sorting and grading: Hand-sorting by size (premium retail, processing-grade, feed-grade), by skin condition (intact, lightly damaged, severely damaged), and by varietal class (white-fleshed, yellow-fleshed, orange-fleshed for OFSP-specific channels). Mechanical sorting at commercial-aggregator scale.

• Storage — traditional: Pit storage (clay-lined pits with straw insulation — the smallholder reference); clamp storage (above-ground clamp covered with straw and soil — the cooperative reference); 4–6 month storage life under proper conditions.

• Storage — commercial cold storage: Controlled-temperature storage at 14–16°C and 85–95% RH; storage life 6–9 months at proper conditions. Commercial cold-storage adoption growing through 2024–2026 alongside OFSP commercial value-add scale-up.

• Storage — critical avoidance: Sweet potato is chilling-sensitive — storage below 12°C produces chilling injury (pithy core, off-flavour, rapid deterioration on warming). Refrigerator storage at typical 4–7°C is incorrect for sweet potato.

• Pest control: Sweet potato weevil (Cylas formicarius and Cylas brunneus) is the principal storage pest; weevil damage during storage is the major cause of post-curing loss. Sanitation, varietal resistance, and storage discipline are principal controls.

The processing & value-add landscape

• Fresh retail (the dominant channel): Whole-root retail through urban-and-peri-urban markets carries the largest volume share of regional sweet potato post-harvest commerce. Premium-grade graded sorted retail product commands 30–60% over mixed-grade informal-market trade.

• OFSP puree (the value-add flagship): Cooked, mashed, pasteurised orange-fleshed sweet potato puree for commercial bakery integration, baby-food formulation, and humanitarian-procurement supply. Major regional operators: Africa Improved Foods (AIF Rwanda — the flagship); emerging Kenya, Uganda, Tanzania commercial-scale operators; Smart Logistics Solutions OFSP supply chain.

• Sweet potato flour: Sun-dried or mechanically-dried sweet potato chips milled into flour; emerging premium-niche commercial scale; OFSP-flour blended into composite-flour formulations for bread-and-baked-goods value-add.

• Chips and crisps: Sun-dried sweet potato chips (traditional smallholder preservation method); commercial sweet potato crisps for snack retail (limited current regional commercial scale; emerging premium-retail trajectory).

• Vine and leaf integration (cross-reference): Sweet potato vines as livestock fodder (covered in Seed Series Issue 6); sweet potato leaves as indigenous-vegetable retail (covered in Seed Series Issue 10 and Post-Harvest Issue 10 forthcoming).

• Specialty value-add: Premium-retail OFSP single-origin operators; vitamin-A-fortified composite flour brands; emerging OFSP-based ready-to-drink beverages; specialty bakery operators producing OFSP-integrated bread, cake, and biscuit retail product lines.

Standards & quality

• Curing protocol: 4–7 days at 28–32°C and 85–95% RH for storage-grade roots.

• Storage temperature: 14–16°C optimal (avoid below 12°C — chilling injury threshold).

• Storage relative humidity: 85–95% optimal.

• Foreign matter and damage tolerance: typically maximum 5% damaged or weevil-infested roots for premium-grade.

• OFSP-specific: minimum beta-carotene content for vitamin-A-bio-fortified-grade designation (HarvestPlus protocols).

• Certification: KEBS, TBS, UNBS, RSB, BBS standards apply; HACCP and ISO 22000 for puree processing operations.

Where to source equipment, services, and processors

• Kenya: Equipment: KALRO Kabete-and-Tigoni-linked supplier networks; cold-storage equipment supplier networks. Processors and aggregators: Smart Logistics Solutions; Sasini Limited; emerging premium-niche OFSP operators in Mt Kenya and Western Kenya; HarvestPlus-affiliated value-chain pilots.

• Tanzania: Equipment: TARI Ukiriguru-and-Tengeru-linked networks. Processors and aggregators: emerging cooperative operators in Lake Zone and Southern Highlands; HarvestPlus Tanzania value-chain pilots; AGCOT-cluster aggregators where production overlaps.

• Uganda: Equipment: NaCRRI Namulonge-linked networks (the regional OFSP research anchor). Processors and aggregators: Operation Wealth Creation distribution; HarvestPlus Uganda; emerging cooperative-and-commercial OFSP operators.

• Rwanda: Equipment: AIF-affiliated processing equipment; RAB-linked supplier networks. Processors and aggregators: Africa Improved Foods (AIF — the regional flagship); Smart Logistics Solutions Rwanda; cooperative DVM-linked supply chains across Eastern, Southern, and Northern Provinces.

• Burundi: Equipment: regional imports. Processors: emerging cooperative operators; ISABU-linked networks.

Bottom line

Sweet potato post-harvest is the regional bio-fortification-flagship value-add story — curing-discipline-anchored, OFSP-commercial-trajectory-defined, AIF-Rwanda-modelled. The post-harvest gap between informal-market and premium-retail outcomes is unusually large, creating structural commercial-development opportunity for cooperative-and-commercial operators willing to invest in curing-and-puree infrastructure.

For smallholder sweet potato producers, the actionable rule is curing-protocol adherence (4–7 days at 28–32°C and 85–95% RH) followed by participation in cooperative-aggregator networks for graded retail or value-add channel access. For commercial operators and impact investors, scaling OFSP puree-and-flour processing infrastructure into Kenyan, Ugandan, Tanzanian, and Burundian production zones represents the regional commercial-development trajectory paralleling the AIF Rwanda model. For policy and impact investment, OFSP value-add represents one of the strongest available regional bio-fortification commercial cases.

Why this matters

Cassava is East Africa’s most-produced root crop and the regional crop with the most distinctive post-harvest discipline framework — anchored by the structural cyanide-management question and by the highest fresh-root post-harvest deterioration rate of any major regional crop. Annual regional production exceeds 25 million tonnes across the five countries, with Tanzania the regional production leader, Uganda contributing substantial volume, and Kenya, Rwanda and Burundi production substantial at country level.

Cassava post-harvest economics are dominated by two structural disciplines: cyanogenic glucoside management (the cyanide question covered in this Issue’s upfront pull-out box) and rapid post-harvest processing (the fresh roots deteriorate within 24–72 hours of harvest, faster than any other regional crop). The processing-decision matrix — fresh-root rapid sale, sun-drying for chips and flour, traditional fermentation for gari and fufu, or modern high-quality cassava flour (HQCF) processing — determines downstream commercial outcome and is increasingly anchored by emerging commercial-scale operators across the region.

The post-harvest landscape: lifting, curing, storage

• Harvest timing (the rapid-deterioration discipline): Cassava roots are typically left in the soil until needed for processing or sale (the soil itself functions as natural storage). Harvest triggers the 24–72 hour deterioration window during which roots must be processed or consumed. The discipline structurally limits cassava commercial scale-up unless processing infrastructure is co-located with production.

• Lifting / harvesting: Hand-lifting (the regional standard); mechanical harvesting at large-commercial scale (limited regional adoption). Damage during lifting accelerates post-harvest deterioration.

• Peeling: Manual peeling at smallholder scale (the dominant regional practice); mechanical peeling at commercial scale. Removes the outer skin (concentrated cyanogen content) and the corky pulp layer beneath. Peeling is the foundational cyanogen-reduction step.

• Cyanogen reduction processing (the safety discipline): Multiple processing routes reduce cyanogen content to safe consumption levels. Sweet varieties: peeling + boiling sufficient. Bitter varieties: grating + dewatering + sun-drying or fermentation required. Cyanogen content reduction targets: below 10 mg HCN/kg in finished cassava flour (Codex Alimentarius and EAC standard for human consumption).

• Sun-drying for chips: Peeled cassava sliced into chips, sun-dried on tarps or raised drying beds for 3–7 days to 12–14% moisture; the smallholder traditional preservation method.

• Fermentation processing: Traditional fermentation processes (heap fermentation for gari production, soak-fermentation for fufu, lafun) reduce cyanogen content through enzymatic linamarin breakdown and HCN volatilisation; produce traditional regional foods with distinct flavour profiles.

• Storage — fresh roots: Not storable beyond 72 hours under ambient conditions; some experimental modified-atmosphere and waxing methods extend storage to 2–3 weeks but limited commercial scale.

• Storage — processed forms: Cassava chips and flour stored in polypropylene bags or hermetic storage for 6–12 months; cassava starch stored similarly; gari and fufu typically consumed within weeks of preparation.

The processing & value-add landscape

• Fresh-root retail (the limited urban channel): Whole peeled or unpeeled cassava roots in urban-and-peri-urban retail; rapid sale within 24–72 hours of harvest is the operational reality. Volume share modest relative to total cassava production.

• Sun-dried chips and traditional flour: The dominant smallholder preservation route; chips milled into traditional cassava flour for ugali, porridge, and traditional baking applications. Significant regional volume share.

• High-Quality Cassava Flour (HQCF) — the emerging commercial channel: Modern processing route: peeling, grating, dewatering, sun-or-mechanical drying, milling. Produces fine, white, neutral-flavour flour with structural commercial trajectory through bread-and-bakery composite-flour applications, biscuit-and-snack manufacturing, and industrial starch-derivative production. Major emerging regional operators: IITA-Kampala-supported pilot operations; Bakhresa-affiliated cassava-flour pilots; emerging cooperative-and-commercial operators in Tanzania, Uganda, Kenya.

• Cassava starch extraction: Wet processing extracts native starch for industrial-and-food applications: textile starch, paper starch, food-grade starch, modified starch. Limited current regional commercial scale; structural commercial trajectory through 2024–2026.

• Gari, fufu, lafun (West African traditional adopted regionally): Fermented cassava products with structural cultural-and-commercial role in regional West African community markets and emerging premium-niche urban retail; commercial gari production growing in Tanzania and Uganda through 2024–2026.

• Cassava beer and ethanol: Tanzania has demonstrated commercial cassava beer pilots (Serengeti Breweries Kibao brand and similar emerging products) using cassava starch as fermentation feedstock; cassava ethanol distillation pilots also under development. Significant emerging commercial trajectory.

• Animal feed: Cassava chips and flour as poultry-and-livestock-feed energy input; cassava peels as ruminant-feed supplement; cassava-based composite feed formulations.

• Specialty value-add: Tapioca pearl manufacturing; cassava-derived industrial dextrin; emerging cassava-based gluten-free bakery product lines; bio-fortified cassava (CMD-resistant high-vitamin-A cassava covered in Seed Series Issue 18 frontier section).

Standards & quality

• Cyanogen content: maximum 10 mg HCN/kg in cassava flour for human consumption (Codex Alimentarius and EAC harmonised standard).

• HQCF moisture content: typically maximum 12% for shelf-stable storage.

• HQCF colour grade: typically minimum L* value 85 (Hunter colour scale) for premium-grade white flour.

• HQCF foreign matter: typically maximum 0.5% for premium-grade.

• Cassava starch: typically minimum 88% starch content for premium industrial-grade.

• Total cyanogenic potential (sweet vs bitter classification): below 50 mg HCN/kg fresh root for sweet varieties; above 100 mg/kg for bitter varieties (extensive processing required).

• Certification: KEBS, TBS, UNBS, RSB, BBS standards; HACCP and ISO 22000 for HQCF and specialty processors.

Where to source equipment, services, and processors

• Kenya: Equipment: KALRO Mtwapa-and-Embu-linked supplier networks. Processors: emerging Coast and Western Kenya HQCF operators; Smart Logistics Solutions cassava supply chain.

• Tanzania: Equipment: TARI Ukiriguru-linked networks (the regional cassava research centre); IITA Tanzania-supported pilot equipment networks. Processors: Bakhresa Group cassava-flour pilots; Serengeti Breweries cassava beer (Kibao brand); emerging Lake Zone and Coast HQCF operators; AGCOT-cluster aggregators where cassava production overlaps.

• Uganda: Equipment: NaCRRI Namulonge-and-Serere-linked networks; IITA Kampala (the regional cassava research-and-extension anchor). Processors: emerging Lango-and-Acholi HQCF operators; Operation Wealth Creation distribution.

• Rwanda: Equipment: RAB-linked supplier networks. Processors: limited current commercial scale; emerging Eastern Province cooperative operators; Africa Improved Foods (AIF) cassava-based formulations.

• Burundi: Equipment: regional imports. Processors: ISABU-linked networks; emerging Imbo-and-Bururi cooperative operators.

Bottom line

Cassava post-harvest is the regional rapid-deterioration-discipline crop with structural cyanogen-management framework and emerging commercial-value-add trajectory through HQCF, starch, beer, and gari channels. The 20–50% post-harvest loss rate is the highest of any regional crop and reflects the combination of agro-ecological constraints (24–72 hour deterioration window) and processing-infrastructure gaps that have not yet been closed at scale.

For smallholder cassava producers, the actionable rule is co-location with processing infrastructure or rapid-sale logistics; informal-market trade beyond the 72-hour window structurally surrenders crop value. For commercial operators and impact investors, HQCF processing infrastructure represents one of the strongest available regional commercial-development opportunities — combining import substitution (HQCF-blended composite flour for bakery), industrial-starch supply chain development, and cassava-beer commercial trajectory. For governments, supporting IITA-affiliated regional cassava research pipelines and emerging HQCF processing infrastructure is the available public-sector contribution.

Why this matters

Yam is East Africa’s minor regional root crop with structural cultural-staple-emerging-into-commercial trajectory. Unlike West Africa (where yam is the dominant root crop and where the yam-barn architectural-and-storage tradition anchors major commercial economic systems), East African yam production is modest and principally smallholder-scale. Multiple species shape regional production: Dioscorea rotundata (white yam, the dominant West African species, modest East African production); D. alata (water yam, more common in coastal East Africa); D. cayenensis (yellow yam); D. esculenta (chinese yam, smaller-tuber species); and minor wild and cultivated species.

Yam post-harvest economics combine a moderate-perishability profile (better than cassava’s 24–72 hour deterioration but worse than dry grain crops), a meaningful curing-and-storage-architecture tradition (the West African yam-barn approach adaptable to regional zones), and a growing commercial-niche trajectory through urban regional South Asian community markets, West African community markets, and emerging premium-retail single-origin operators. The post-harvest infrastructure remains under-developed relative to the commercial trajectory.

The post-harvest landscape: lifting, curing, storage

• Harvest timing: Yams typically harvested 8–11 months after planting at full tuber maturity; vine senescence indicates harvest readiness. Multiple harvests possible from staggered planting.

• Lifting / digging: Hand-digging (the regional standard); careful tuber extraction to avoid lifting damage; damage during lifting reduces curing outcomes and storage life dramatically.

• Curing: Yam tubers cured for 1–2 weeks at 25–40°C and 60–70% relative humidity to harden skin and heal lifting wounds. Curing extends storage life from 4–6 weeks (uncured) to 4–6 months (properly cured). Smallholder curing: pile under shade with adequate ventilation; cooperative scale: dedicated curing rooms; commercial scale: integrated curing-storage facilities.

• Sorting and grading: Hand-sorting by size (premium retail, processing-grade, planting-stock-grade), by skin condition, and by varietal class.

• Storage — yam barn (the West African traditional architecture): Suspended-tuber storage in elevated wooden frames with adequate ventilation; the West African traditional architectural tradition adaptable to East African production zones. Storage life 4–6 months under proper conditions.

• Storage — pit and warehouse: Pit storage with straw insulation (smallholder regional reference); cool-and-dry warehousing at 12–16°C and 65–70% RH (commercial-scale standard); 4–6 month storage life under proper conditions.

• Pest control: Yam beetle (Heteroligus meles); yam tuber moth; nematode pressure during pre-harvest. Storage pest pressure manageable with sanitation and proper curing-and-storage discipline.

The processing & value-add landscape

• Fresh retail (the dominant channel): Whole-tuber retail through urban-and-peri-urban markets serving regional South Asian community markets, West African community markets, and emerging premium-retail single-origin operators. Volume share modest relative to other regional staples.

• Pounded yam (West African traditional): Boiled and pounded yam preparation for traditional West African community-market consumption; emerging commercial pre-cooked pounded-yam product lines for urban convenience-food retail.

• Yam flour and dried products: Sun-dried yam slices milled into yam flour; emerging premium-niche commercial scale. Yam flour as a gluten-free flour alternative in specialty retail.

• Yam chips and crisps: Limited current regional commercial scale; emerging premium-snack retail trajectory.

• Specialty value-add: Premium-retail single-origin yam brands; emerging West-African-community-market focused yam product lines; specialty restaurant-supply chains.

• Animal feed (off-grade): Off-grade and damaged yams as livestock feed; modest scale.

Standards & quality

• Curing protocol: 1–2 weeks at 25–40°C and 60–70% RH for storage-grade tubers.

• Storage temperature: 12–16°C optimal; below 12°C produces chilling injury similar to sweet potato.

• Storage relative humidity: 65–70% optimal.

• Foreign matter and damage tolerance: typically maximum 5% damaged or insect-infested tubers for premium-grade.

• Certification: KEBS, TBS, UNBS standards apply; emerging premium-retail and export operators may require HACCP and origin documentation.

Where to source equipment, services, and processors

• Kenya: Equipment: regional commercial suppliers. Processors: limited; emerging premium-niche Coast and Mt Kenya operators.

• Tanzania: Equipment: TARI-linked networks. Processors: cooperative networks in Coast and Lake Zone; emerging premium-niche operators.

• Uganda: Equipment: NaCRRI-and-IITA-Kampala-linked networks. Processors: emerging cooperative operators in Western and Eastern regions.

• Rwanda: Limited commercial yam supply at scale.

• Burundi: Limited commercial yam supply at scale.

Bottom line

Yam post-harvest is the regional minor-root-crop watching-brief category — limited current production scale relative to West African dominance, structurally rising regional South Asian and West African community-market commercial trajectory, established yam-barn architectural-and-storage tradition adaptable to East African production zones.

For smallholder yam producers, the actionable rule is curing-protocol adherence and yam-barn or equivalent-suspended-storage construction for extended storage life. For commercial operators and impact investors, yam represents an emerging premium-niche commercial trajectory paralleling the indigenous-vegetable success documented in Seed Series Issue 10 — small current scale, clear structural demand profile, dependent on coordinated production-and-processing infrastructure investment momentum that has not yet fully materialised.

Cross-cutting recommendations

• Make curing the foundational sweet-potato investment. The 4–7 day at 28–32°C and 85–95% RH curing protocol is the most empirically documented post-harvest intervention for sweet potato — extending storage life from 2 weeks to 4–6 months and capturing structural commercial value that uncured-root informal-market trade surrenders. Cooperative-and-commercial curing infrastructure is the regional commercial-development priority.

• Scale OFSP value-add processing infrastructure. Africa Improved Foods (AIF Rwanda) provides the regional reference commercial model for OFSP puree, fortified-cereal, and bakery-integration value-add. Scaling the AIF model into Kenyan, Ugandan, Tanzanian, and Burundian production zones represents the regional bio-fortification commercial-development opportunity with the strongest available impact-and-commercial case.

• Co-locate cassava processing with production. The 24–72 hour fresh-root deterioration window structurally requires processing infrastructure within rapid-transport range of production zones. Cooperative-and-commercial HQCF, gari, chip-and-flour processing operators co-located with Tanzanian Coast-and-Lake-Zone, Ugandan Lango-and-Acholi, and Kenyan Coast-and-Western production heartlands represent the regional cassava-industry commercial-development structure.

• Integrate cyanogen-management discipline into commercial cassava processing. The Codex Alimentarius and EAC harmonised 10 mg HCN/kg cassava flour standard is non-negotiable for human-consumption-grade product. HQCF processing protocols integrate cyanogen-management into structured commercial procedures; informal-processing cassava can fail the standard. Laboratory testing through KEPHIS, TBS, UNBS and equivalent institutions anchors the safety framework.

• Develop the cassava beer and ethanol commercial trajectory. Tanzania’s Serengeti Breweries (Kibao brand) has demonstrated commercial cassava-beer commercial viability; emerging cassava-ethanol distillation pilots provide structural commercial trajectory. Cassava beer-and-ethanol channels represent emerging regional commercial-development opportunities paralleling the sorghum-and-barley contracted-brewing models documented in Issue 1 of this Series.

• Build yam-barn or equivalent suspended-storage infrastructure. The West African yam-barn architectural-and-storage tradition is structurally adaptable to East African production zones; cooperative-and-commercial yam-barn construction extends storage life from 4–6 weeks to 4–6 months and unlocks emerging premium-niche commercial trajectory through urban regional South Asian and West African community-market channels.

Editor’s note

This Issue is the fifth of nine planned in Post-Harvest Series 1. Root-and-tuber post-harvest infrastructure, equipment availability, processor commercial structures, regulatory standards (particularly cassava cyanogen content limits and OFSP bio-fortification protocols), and emerging commercial-pilot operations all evolve year-by-year. Corrections, updates, and contemporary commercial-pilot information from extension officers, equipment suppliers, processors, exporters, cooperatives and growers are welcomed at editor@kilimokwanza.org.

Coming next — Issue 6 • Vegetables Post-Harvest: tomato, onion, cabbage, kale (sukuma wiki), spinach, carrot, eggplant, peppers, okra, and pumpkin. The crop category that anchors regional fresh-produce post-harvest economics with cold chain emerging as the central infrastructure question — with structural premium-supermarket-versus-informal-market price differentials, emerging tomato puree and processed-vegetable value-add, and the structural East African horticultural-industry trajectory.

Compiled by the Kilimokwanza Editorial Desk • Series Editor: Anthony Muchoki • kilimokwanza.org

Related reading

Livestock, Fisheries & Apiculture Series, Issue 6: BroilersNovember 9, 2026Seed Series, Issue 6: Roots & TubersNovember 9, 2026Black Pepper Farming in East Africa: Value-Chain & Profit GuideNovember 8, 2026

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