Farmers of the Peruvian Andesmake use of seed-size variation as a source offlexibility in the production of ``nativecommercial'' farmer varieties of Andeanpotatoes and ulluco. In a case study of easternCuzco, the use of varied sizes of seed tubers isfound to underpin versatile farm strategiessuited to partial commercialization (combinedwith on-farm consumption and the next season'sseed). Use of seed-size variation also providesadaptation to diverse soil-moistureenvironments. The importance and widespread useof seed-size variation among farmers isdemonstrated in the emphasis and consistency oflinguistic expressions (...) about this trait. Smalland small-medium seed is typically sown in thecommunity's ``Hill'' unit of sub-humid,upper-elevation agriculture. Seed tubers ofmedium-size and larger are needed fordrought-stressed locales in lower-elevationlandscape units. Farm-level preferences for theseed-size of tubers also suggest potentialrelations to resource endowments of farmhouseholds and gender-related management,although these tendencies were notstatistically significant in the study. Anintra-varietal, landscape-environmentalperspective on seed-size management, whichincludes an emphasis on within-fieldversatility, helps to strengthen the researchsupport of local seed production in policiesand programs aiming for in situagrobiodiversity conservation, marketingcapacity, and food security. (shrink)

Farmers in Andean communities depend on complex farming systems that combine native and introduced crops, production for subsistence, and production for the market. Home to the well-known potato, the Andean region is also the native place of hundreds of lesser known varieties of tubers such as oca, ulluco, and mashua. Using data from interviews and field observation in the Peruvian community of Picol, we describe the economic and social relevance of these tuber crops in the context of the local (...) farming system. A cross-case comparison of households is used to examine the relationship between socioeconomic status and the allocation of family resources. We also explore how different agricultural practices relate to the biodiversity of indigenous tuber crops. (shrink)