通过二年田间试验和化学分析表明,高、中、矮秆春小麦品种,其体内氮素浓度有明显差异;随着施用氮肥的增扣,体内全氮,硝态氮含量随之提高,而无机磷有减少趋势,体内硝态氮和无机磷呈高度负相关(r=-0.725 n=15拔节期)。应用Ulrich确定最适浓度和临界浓度的方法,获得了三个不同小麦品种在拔节期、抽穗期的全氮量和硝态氮的最适浓度和临界浓度,以及低、中、高、过量四级诊断指标。为了推广应用,提供了化学诊断与外形诊断相结合的综合诊断施肥技术 After two years of field experiment and chemical analysis, the results showed that there was a significant difference in the concentrations of nitrogen among the high, medium and short spring wheat varieties. With the increase of nitrogen application, the content of total nitrogen and nitrate nitrogen increased, Phosphorus had a decreasing trend, and nitrate nitrogen and inorganic phosphorus had a highly negative correlation (r = -0.725 n = 15 jointing stage). Using Ulrich to determine the optimum concentration and critical concentration, we obtained the total nitrogen concentration and the optimum concentration and critical concentration of nitrate nitrogen at jointing stage and heading stage of three different wheat cultivars, as well as the low, middle, high, Diagnostic indicators. In order to promote the application, provided a combination of chemical diagnosis and shape diagnosis of integrated diagnostic fertilization technology