Collaborative agribusiness models, in the sense used by the study, are partnerships built on a win-win logic: smallholder farmers, input suppliers, off-takers, and service providers coordinate their activities along the value chain. In practice this takes two main forms in Wanging’ombe. Collaborative procurement means farmers pool their orders for certified seed potatoes, fertilizers, fungicides, and pesticides, cutting search and transport costs and often securing lower prices. Collaborative marketing means aggregating harvested potatoes to sell collectively to wholesalers and retailers, which strengthens bargaining power and opens the door to larger, more dependable buyers. Both mechanisms aim to reduce the transaction costs that weigh heaviest on the smallest producers.

The empirical setting is the Potato Market Linkages Enhancement Project, known as PMALEP, which was implemented in Wanging’ombe to tackle the absence of structured ware potato markets, limited adoption of good agronomic practices, shortages of clean seed varieties preferred by buyers, and gaps in farmer skills. The project deliberately reserved 15 percent of its beneficiary slots for young farmers. It is against this backdrop that Ngozi asked a question with direct policy relevance: what determines whether a young smallholder participates in these collective arrangements?

To answer it, the study drew a sample of 124 young potato farmers from a known population of 180 project beneficiaries, using a multistage design that first purposively selected Wanging’ombe district, then four villages, Ilulu, Mhaji, Itowo, and Ihatunzi, and finally applied proportionate stratified random sampling. Of the 124 respondents, 45 participated in collaborative potato marketing and 79 did not, while 54 took part in collaborative input procurement and 70 did not. Data were collected with a pre-tested semi-structured questionnaire, supplemented by key informant interviews and document review, and analyzed in STATA using chi-square tests, t-tests, and a probit regression model suited to a binary participation decision.

The theoretical scaffolding rests on three pillars. Transaction cost economics explains why small-scale farmers, who face high search, contracting, and coordination costs, gain most from aggregating produce and pooling input orders. Social capital theory highlights how networks, norms, and trust built through repeated cooperation make collective action durable. Collective action theory frames the models themselves: shared goals, resource sharing, knowledge exchange, and joint decision-making generate economies of scale that no individual smallholder could achieve alone. Together these frameworks predict that household characteristics and enterprise characteristics should shape the probability of participation.

The comparative results are striking. Participants in collaborative input procurement farmed more total land, 2.24 acres on average, and devoted more plot area, 0.84 acres, to potatoes than non-participants. They also purchased and applied significantly larger quantities of basal fertilizer, 78.61 kilograms, top-dressing fertilizer, 92.40 kilograms, and seed potatoes, 674.03 kilograms. Their harvests were correspondingly larger, at 7,482.51 kilograms, and their revenue reached 1,151,422 Tanzanian shillings. Farmers engaged in collaborative marketing sold significantly more potatoes, 4,060.72 kilograms, earned higher revenue of 1,355,626 shillings, and pocketed a significantly greater profit of 921,354.60 shillings than those selling alone. Participants also bore higher input costs, reflecting their larger cultivated areas and heavier use of certified seed and fertilizer.

One result cuts against expectations. Young farmers who joined collaborative marketing actually purchased less seed potato, 455.65 kilograms on average, than those outside the model. The author interprets this as evidence that better market access does not automatically translate into expanded production investment; without affordable credit and reliable supplies of quality seed, collective marketing alone may not push young farmers to scale up. This nuance matters for program design, suggesting that market linkages must be paired with complementary financial and input-supply interventions if youth are to intensify potato production.

The probit regression, statistically significant overall with a likelihood ratio chi-square of 26.65 and a pseudo R-squared of 0.68, identifies several decisive drivers. Young women were 19 percent less likely than young men to participate in collaborative marketing, a gap the study attributes to lower land ownership and reduced awareness of the benefits of collective selling. Each additional unit of potato plot size raised participation probability by 30 percent, while each unit of basal fertilizer purchased raised it by 90 percent, both operating through the simple mechanism that more land and more fertilizer yield more potatoes available for collective sale. Higher profit from potato production increased participation likelihood by 12 percent, echoing wider evidence that income and assets gate access to collective schemes.

Two findings carry uncomfortable policy messages. First, rising basal fertilizer costs reduced the probability of participation in collaborative marketing dramatically, a reminder that Tanzania’s fertilizer price build-up and supply-chain costs remain a binding constraint on smallholder intensification. Second, and more puzzling, attendance at farm business training was associated with lower participation, reducing the likelihood of joining collaborative marketing by 24 percent and collaborative procurement by 27 percent. The most plausible explanation offered is that existing training curricula simply do not cover collaborative agribusiness models, so farmers learn agronomy and bookkeeping without ever being taught why and how to market or procure collectively.

The study’s policy implications follow directly. Awareness campaigns should target young farmers, especially women, to communicate the concrete benefits of collaborative potato marketing. Farm business training manuals should be revised to include modules on collective procurement and marketing. And government policy should prioritize improving land access and ownership for young farmers, since plot size emerged as a significant positive determinant. The author is candid about limitations: the sample of 124 farmers limits generalizability beyond Wanging’ombe, and potential endogeneity from self-selection and reverse causality means future work should employ instrumental variable or panel data methods. Even so, the message is clear. If Tanzania wants its youth to see farming as a business rather than a fallback, the cheapest lever may be teaching them the power of acting together, and removing the land and cost barriers that keep the most constrained farmers out of the room.

Subject of Research: Determinants of young smallholder farmers' participation in collaborative agribusiness models in Tanzanian potato farming

Article Title: Determinants of participation in collaborative agribusiness models among young potato smallholder farmers in Wanging’ombe, Tanzania

Article References: Ngozi, S. (2026). Determinants of participation in collaborative agribusiness models among young potato smallholder farmers in Wanging’ombe, Tanzania. Discover Agriculture, 4(1), Article 308. https://doi.org/10.1007/s44279-026-00787-x

Image Credits: AI Generated

DOI: 10.1007/s44279-026-00787-x

Keywords: collaborative agribusiness, potato farming, Tanzania, smallholder farmers, youth in agriculture, collective marketing, collaborative procurement, probit regression, transaction costs, land access, fertilizer costs, Wanging'ombe