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为探究适宜滴灌春小麦的氮素诊断方法，比较了硝酸盐反射仪、GreenSeeker手持光谱仪和SPAD-502叶绿素计三种氮素营养诊断施肥方法，分析不同生育时期测定指标与施氮量和产量之间的关系。结果表明，小麦茎基部NO-₃含量、归一化植被指数（NDVI）和叶绿素含量相对值（SPAD）三种诊断指标与施氮量的拟合度均较高，与产量呈显著或极显著正相关，均可用于滴灌春小麦氮素营养诊断施肥。三种诊断指标与施氮量、产量的决定系数均表现为NDVI＞SPAD＞茎基部NO-₃含量。硝酸盐指标与施氮量的拟合精度较差，试验操作也相对繁琐；GreekSeeker手持光谱仪法表现最优，拟合精度高，操作方便，较适合用于滴灌春小麦的诊断施肥；SPAD值与施氮量的拟合度也较高，也可以作为一种氮素诊断参考方法。

英文摘要:

In order to explore the appropriate nitrogen diagnosis methods on drip-irrigated spring wheat, the three methods of nitrate reflectometer, GreenSeeker handheld spectrometer and SPAD-502 chlorophyll meter were compared. The relationship between the three indicators and N application rate and yield were analyzed at different growth stages. The results indicated that the correlations between the three diagnostic indicators with N application and yield were significantly or very significantly positive. The three indicators can be used for diagnostic fertilization for drip-irrigated spring wheat. The fit of goodness of the three indicators with N application and yield was as NDVI> SPAD> NO-₃ concentrations. The result on Nitrate lacked reliability and stability, the experimental operation was relatively cumbersome. The diagnosis results of Greekseeker handheld spectrometer was the best for N diagnosis among the three methods, and was stable and easy to operate, which was suitable for use in the diagnosis of fertilizer in drip-irrigated spring wheat. In addition, SPAD-502 can be also used as a N diagnostic method.

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