(一)土壤诊断、因土施肥的科学作用“粪大水勤,不用问人。”在科学技术不断发展的情况下,已不适用。降低成本提高经济效益,是群众迫切需要解决的问题。据调查,石家庄地区15个点小麦生产成本1981年比1980年上升10.8%,其中物资消耗增加26.5%。1982年化肥占物资消耗的51.2%,成本又比1981年上升6%。虽然亩产五、六 (A) soil diagnosis, the scientific role of soil fertilization “excrement water, do not ask people.” In the case of the continuous development of science and technology, it does not apply. Reduce costs and improve economic efficiency, the masses are urgent problems to be solved. According to the survey, the production cost of 15 spots of wheat in Shijiazhuang increased by 10.8% over 1981 in 1981, of which the consumption of materials increased by 26.5%. In 1982, chemical fertilizer accounted for 51.2% of the total consumption of materials, which in turn increased by 6% over 1981. Although yield five or six