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研究了冬小麦—夏玉米轮作制度下二苯胺法和反射仪法在两种作物氮营养诊断中的应用。提出冬小麦的最佳氮营养诊断时期和诊断部位为拔节前茎基部节间组织，夏玉米为拔节前功能叶叶脉。确定了两种作物采用两种方法进行氮素营养诊断的临界值，冬小麦为2.00（NO3-N色阶，二苯胺法）、1500mgkg-1（NO3-，反射仪法）;夏玉米为2.40（NO3--N色阶，二苯胺法）和1240mgkg-1（NO3-，反射仪法）。同时建立了两种作物基于氮素营养诊断的作物追肥推荐模型:冬小麦:Nd＝220.2-95.8Td（二苯胺法）Nd＝220.2-0.147Tr（反射仪法）夏玉米:Nd＝185.9-72.5Td（运城，二苯胺法）Nd＝185.9-0.13Tr（运城，反射仪法）Nd＝176.2-80.5Td（永济，二苯胺法）
The application of diphenylamine method and reflectometer in winter wheat-summer maize rotation system in the diagnosis of nitrogen nutrition of two crops was studied. Proposed the best winter wheat nitrogen diagnosis and diagnosis of the diagnosis site for the pre-jointing stem base of the internode tissue, summer maize is the pre-jointing function leaf veins. The critical value of nitrogen nutrition diagnosis by two methods was determined in two crops. The winter wheat was 2.00 (NO3-N level, diphenylamine method), 1500mgkg-1 (NO3-, reflectometer method) NO3 - N levels, diphenylamine method) and 1240mgkg-1 (NO3-, reflectometer method). At the same time, two models of crop top dressing recommendation based on nitrogen nutrition diagnosis were established: winter wheat: Nd = 220.2-95.8Td (diphenylamine method) Nd = 220.2-0.147Tr (reflectometer method) summer maize: Nd = 185.9-72.5Td (Yuncheng, diphenylamine method) Nd = 185.9-0.13Tr (Yuncheng, reflectometer method) Nd = 176.2-80.5Td (Yongji, diphenylamine method)