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一、试验基本情况与方法１、土壤条件本试验设在开封县杜良乡小岗村，土类潮土，土质中壤，土层深厚，结构良好，质地均一。土壤ＰＨ值７５－７６，有机质含量为１３８％，碱解氮含量为８８８８ｍｇ／ｋｇ，速效磷含量为１４９ｍｇ／ｋｇ，速效钾含量为８９７...
First, the basic conditions and methods of testing 1, the soil conditions The test is located in Kaifeng County Duliang Township Xiaogangcun, soil-like soil, soil soil, soil deep, good structure, uniform texture. Soil PH value of 7 5-7 6, organic matter content of 1 38%, alkaline hydrolysis of nitrogen content of 88 88 mg / kg, available phosphorus content of 14 9 mg / kg, available potassium content of 89 7 ...