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夏玉米是一种需氮肥较多的作物,合理施用氮肥是增加玉米产量,提高氮肥利用率的重要措施。近年来随着我省化肥工业的发展,用于夏玉米氮肥的数量也越来越多,但氮肥的增产效果却逐年降低。造成氮肥肥效降低的因素很多,其中施肥过量和施用方法不当是主要因素。为了充分发挥氮肥的增产效益,提高氮肥的利用率,我们在82年研究氮、磷、钾肥的用量对夏玉米增产效果影响的基础上,布置了夏玉米氮肥最佳施用量的课题。现将所得结果整理分析如下。
Summer maize is a kind of crop that needs more nitrogenous fertilizer. Reasonable application of nitrogenous fertilizer is an important measure to increase corn yield and improve nitrogen fertilizer utilization rate. In recent years, with the development of fertilizer industry in our province, the amount of nitrogenous fertilizer for summer maize is also more and more, but the yield of nitrogenous fertilizer is decreasing year by year. There are many factors that cause the decrease of nitrogen fertilizer efficiency. Among them, excessive fertilization and improper application methods are the main factors. In order to give full play to the yield-increasing benefit of nitrogenous fertilizer and improve the utilization rate of nitrogenous fertilizer, we studied the optimum dosage of nitrogenous fertilizer for summer maize based on the effect of nitrogen, phosphorus and potassium fertilizer application on the yield-increasing effect of summer maize in 1982. Now the results of finishing the following analysis.