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在京郊不同土壤肥力条件下,进行小麦、玉米两茬间氮、磷、钾肥合理施用的研究.三年多点试验结果表明,全年氮素投入0.036～0.048kg/m~2,以小麦、玉米各半或玉米居多为宜.冬小麦施氮在下茬玉米上无明显后效.冬小麦适宜施氮量为0.024kg/m~2,夏玉米适宜施氮量0.030kg/m~2,冬小麦和夏玉米施磷肥不仅对当季有增产作用,而且对下茬作物也有明显的后效.冬小麦施P_2O_5 0.015kg/m~2、夏玉米0.007kg/m~2为宜.夏玉米比冬小麦对钾肥高度敏感,土壤速效钾含量在90×10~6以下,冬小麦施钾有一定增产效果,而夏玉米施钾肥显著增产.
Under the conditions of different soil fertility in Beijing suburb, the reasonable application of nitrogen, phosphorus and potassium fertilizers between wheat and maize was studied.The results of multi-point experiments for three years indicated that the annual nitrogen input was 0.036 ~ 0.048 kg / m ~ 2, , Half of corn or most of maize is appropriate.No significant aftereffect of winter wheat on N application was obvious in winter wheat.The suitable N application rate was 0.024kg / m ~ 2 in winter wheat, 0.030kg / m ~ 2 in summer maize, Summer maize application of P fertilizer not only increased the yield of the season, but also had obvious aftereffect on the crop of the next crop. Winter wheat P_2O_5 0.015kg / m ~ 2, summer maize 0.007kg / m ~ 2 is appropriate. Highly sensitive, available potassium content in soil below 90 × 10 ~ 6, winter wheat yield increased potassium effect, and summer maize yield increased significantly.