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1981—1985年在土壤普查基础上连续进行了5年氮磷钾化肥增产效果试验。供试土壤有草甸土、黑土、黑钙土、淡黑钙土、发育型风沙土。供试作物为玉米吉单101和四单8,设以下5处理:不施肥,施氮,施磷,施氮磷,施氮磷钾。小区面积50m~2,重复3次,随机排列,垧保苗5万株。施肥量按土壤速效养分含量用养分平衡施肥法计算确定。一般亩施N5—12.5kg,平均8kg;亩施K_2O2.5—7.5kg,平均4kg;亩施K_2O2.5—5kg。氮肥为尿素或硝铵,磷肥为三料或过磷酸钙,钾肥为硫酸钾,各种化肥均做底肥1次施入。
From 1981 to 1985 on the basis of the soil survey conducted a continuous five-year NPK fertilizers yield test. The test soil meadow soil, black soil, chernozem, pale chernozem, developmental aeolian sandy soil. The test crops were corn Jidan 101 and Sidan 8 with the following 5 treatments: no fertilization, nitrogen application, phosphorus application, nitrogen and phosphorus application, and nitrogen, phosphorus and potassium application. Community area 50m ~ 2, repeated 3 times, randomly arranged, 垧 Paul seedlings 50000. The amount of fertilizer according to soil available nutrient content with nutrient balance fertilization method to determine. General Mushi N5-12.5kg, an average of 8kg; Mushi K_2O2.5-7.5kg, an average of 4kg; Mushi K_2O2.5-5kg. Nitrogen is urea or ammonium nitrate, phosphate fertilizer is three or superphosphate, potassium is potassium sulfate, a variety of fertilizers are done at the end of a fertilizer applied.