为了了解我区中、低产区主要土类施用有机、无机肥料和小麦产量关系以及土壤理化性状变化,1982年我们对三县(市)、五个公社、九个大队、十七块麦田进行了实地调查.调查方法:选择土质、前茬、品种、播期、播量等条件基本相同,惟施肥情况不同,即连续五年或五年以上,以施用有机肥为主,无机肥相结合的麦田和以施用化肥为主的麦田相对照,定点定期调查小麦生育状况和产量.麦收后,分析测定土壤理化性状,并取根、杆、糠、籽粒做营养物质分析. In order to understand the relationship between the yield of organic and inorganic fertilizers and wheat and the physical and chemical properties of soils in the main soil types in the middle and low yielding areas in our district, in 1982, we conducted three counties (cities), five communes, nine brigades and seventeen wheat fields Field survey. Survey methods: Select soil, crop, variety, sowing date, sowing and other conditions are basically the same, but different fertilizers, that is, for five consecutive years or more, the main application of organic fertilizer, combined with inorganic fertilizers Of wheat fields and fertilizers-based wheat fields in contrast, regular surveys of wheat fertility status and yield of wheat after harvest, the analysis of soil physical and chemical properties, and take roots, stems, bran, grain nutrients do analysis.