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agricultural availability average biophysical CALCULATE Chiangmai classification conservation measures contour deficiency level 2&3 Digital Elevation Model economic elevation environmental Equation expenditure factors farm households farmers Farming Systems field crops Field survey Figure food security household food production household food security improving increase irrigation kg/ha labor land degradation land evaluation land quality land suitability land use alternatives land use map land use sustainability land use types level 2&3 groups livestock Mae Tun watershed Maize major Mungbean NDVI normal nutrition group normal nutrition households nutrient nutrition deficiency groups nutrition deficiency households nutrition deficiency level paddy percent population problem rainfall Remote Sensing RESELECT respondents scenario shifting cultivation socioeconomic soil and water soil conservation soil depth soil erosion soil loss soil texture Source Soybean spatial study area sustainable land sustainable watershed Table techniques Thailand Total Sum upland rice variables vegetation watershed area watershed class