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小麦分蘖期、拔节期可采用测定土壤和植株氮素营养的简易快速诊断技术,来确定各期的适宜施氮量。分蘖期以土壤有效氮含量作为施氮量指标,适宜施氮量为土壤有效氮指标(亩产450kg 左右,土壤有效氮指标为每亩11kg 纯氮)减去分蘖期0～40cm 土层内实测的有效氮含量之差值.拔节期以茎鞘基部硝态氮含量为施氮量的指标,其含量用二苯胺试剂比色法测定颜色等级。不同色级适宜的施氮量为每亩0～4kg 纯氮。
The tillering stage and jointing stage of wheat can be used to determine the appropriate amount of nitrogen application in different periods by the simple and quick technique of determining the nitrogen nutrition of soil and plant. At the tillering stage, the available N content in soil was taken as the index of nitrogen application, and the suitable nitrogen application rate was soil available nitrogen index (about 450kg per mu, soil available nitrogen index was 11kg pure nitrogen per mu) minus 0-40cm soil layer at tillering stage Of the difference between the available nitrogen content.When the nitrate content of the base of stems and sheaths as the index of nitrogen application rate at jointing stage, its content was determined by diphenylamine reagent colorimetric method. Nitrogen suitable for different color levels of 0 ~ 4kg of pure nitrogen per acre.