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0nly 0ther 0wn data collection AC0STA PURISCAL Acosta and Puriscal Agricultural Agro-chemicals analysis annual crops areas basic grains Betriebe C/ha calculated capital cash crops CATIE cattle Coefficient of variation coffee acreage Coffee Caturra Costa Rica covered beans cropping pattern cropping season decreases Development economic enterprises erosion control factors family labour farm income farm sizes farming systems farms in Acosta farms in Puriscal fields fruit trees gross margin Gross margin C/ha harvest hectare higher important improved production techniques increase influence innovation Labour input man-days/ha labour productivity Linear Programming livestock lSBN maize maize production maize/beans managed land measures Meseta Central model farms mulching off-farm pasture land percent in Puriscal perennial crops plots Produccion production level Production value pruning Puriscal farmers reduced RUTHENBERG San Jose Seiten slopes smallholder Soil Conservation soil loss Source sown beans steep sugar cane tobacco topsoil Turrialba Variable costs varieties weeding yields