Use of digital camera to assess nitrogen status of winter wheat in the northern China plain
Use of digital camera to assess nitrogen status of winter wheat in the northern China plain
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DOI：
10.1081/pln-120028872
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发表时间：
2004-01-01
影响因子：
2.1
通讯作者：
Römheld, V
中科院分区：
文献类型：
--
作者：
Jia, LL;Chen, XP;Römheld, V
评估冬小麦 (Triticum aestivum L.) 氮 (N) 状况的最广泛使用的方法是通过燃烧测定植物总氮、测试叶组织中的硝酸盐以及使用 SPAD 读数。然而，由于劳动力需求或成本较高，这些方法很难应用于华北平原广大的小麦种植区。因此，本研究探讨了另一种测量小麦氮状态的方法，即使用数码相机记录从植物冠层反射的可见绿光。该实验在北京附近进行了三个氮水平的多因素田间试验。将小麦冠层反射的绿光强度与总氮浓度、基茎硝酸盐浓度以及叶片的 SPAD 读数进行了比较。结果显示，绿化强度、冠层总氮以及孕穗和开花时的 SPAD 读数之间存在显着的负相关关系。启动时，汁液硝酸盐
The most widely used methods to assess the nitrogen (N) status of winter wheat (Triticum aestivum L.) are the determination of plant total N by combustion, the testing of nitrate in the leaf tissue and the use of SPAD readings. However, due to their labor requirements or high costs these methods can hardly be applied to the huge wheat growing areas of the Northern China Plain. This study therefore examined an alternative method to measure the N status of wheat by using a digital camera to record the visible green light reflected from the plant canopy. The experiment was conducted near Beijing in a multi-factorial field trial with three levels of N. The intensity of green light reflected from the wheat canopy was compared to the total N concentration, to the nitrate concentration of the basal stem, and to the SPAD readings of leaves. The results show significant inverse relationships between greenness intensity, canopy total N, and SPAD readings at booting and flowering. At booting, sap nitrate