SANREM CRSPUSAIDNOMIARC-DASANREM Site OfficeLocal Government Units in LantapanBureau of SoilsFarmers in LantapanPoudel, Durga D.Midmore, David J.Hargrove, W.2016-04-192016-04-191998Agricultural Systems 58(1): 107-1280308-521Xhttp://hdl.handle.net/10919/65302Metadata only recordThis paper examines the factors limiting vegetable crop yields in the uplands of Southeast Asia. A survey of farms and soil sampling conducted in the upper Manupali watershed, Mindinao, the Philippines found large differences in the yields of four common crops: tomato, cabbage, potato, and Chinese cabbage. Nitrogen application was most influential on tomato and cabbage yields; proportion of sand in the top soil and use of fungicide were the primary determinants of potato yields, and family labor availability had the greatest effect on Chinese cabbage yields. Based on multivariate data analysis, the farming systems were grouped into higher and lower external nutrient systems (HEN and LEN). Further application of soil conservation techniques, cropping sequences, and plant protection practices would increase the sustainability of both system types. LEN systems would benefit from increased nutrient application while use of labor saving technologies, crop diversification, and more efficient use of fertilizer would enhance HEN system sustainability.text/plainen-USIn CopyrightCash cropsSoil nutrientsSoil managementSoil conservationAgricultureSoilNutrient managementFarming systemsUpland agricultureVegetable productivityCrop yieldsTomatoCabbagePotatoesChinese cabbageNitrogenHigher external nutrient (hen)Lower external nutrient (len)Cropping sequencesFarm/Enterprise ScaleAbstractCopyright 1998 Elsevier Science Ltd. All rights reserved