To provide the basis for precision fertilization,high yield,superior quality and high efficiency of pepper,the authors analyzed aboveground total nitrogen contents of two pepper varieties,and the correlation with canopy spectral reflectance and SPAD at different nitrogen application level.Results:There was no significant difference between aboveground total nitrogen content and leaf total nitrogen content of pepper under different nitrogen treatments;Plant total nitrogen content was the highest under a moderate amount of nitrogen.Leaf total nitrogen content was significantly correlated with leaf SPAD and the correlation decreased with increasing N fertilizer.Canopy spectral reflectance could reflect aboveground total nitrogen content and leaf total nitrogen content more accurately in 760 ~1 350 nm.It showed that nitrogen status of pepper could be timely monitored by spectrum determination.All these provided some cheap,fast and real-time information to calculate N application by using crops total nitrogen content.%为了给辣椒精准施肥及其高产、优质、高效生产提供依据，分析了2个辣椒品种在不同施氮水平下地上部分的全氮含量及其与冠层光谱反射率和叶绿素含量（SPAD）之间的相关性。结果表明：植株全氮含量在适量施氮处理下达最大值，随着施氮量的增加，叶片全氮含量与叶片 SPAD 呈极显著相关且相关性减小；冠层光谱反射率在760～1350 nm 能较准确地反映地上部分全氮含量和叶片全氮含量，说明通过光谱测定能及时监测辣椒的氮素状况，这为利用作物全氮含量计算施氮量提供了廉价、快速、实时的作物含氮量信息。
展开▼
