Abstract:We select the Langwogou catchment in hilly Loess region as the study area, and use a crop productivity model to investigate the spatial variability of crop productivity. Firstly, the YIELD model, including origin of the model, input files and basic parameters, sub model of calculating crop productivity and flow chart, is briefly described. Secondly, crop potential productivity of the catchment was modeled by integrating Geographic Information System with the YIELD model, and the effects of the type of crop...