Estimating N status of winter wheat using a handheld spectrometer in the North China Plain

文献类型： 外文期刊

第一作者： Li, Fei

作者： Li, Fei;Jia, Liangliang;Miao, Yuxin;Yu, Zihui;Chen, Xinping;Zhang, Fusuo;Li, Fei;Gnyp, Martin L.;Koppe, Wolfgang;Bareth, Georg;Jia, Liangliang

作者机构：

关键词： vegetation indices;N uptake;over-fertilization;field spectrometer

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2008 年 106 卷 1 期

页码：

收录情况： SCI

摘要： Excessive nitrogen (N) fertilizer application is very common in the North China Plain. Diagnosis of in-season N status in crops is critical for precision N management in this area. Remote sensing, as a timely and nondestructive tool, could be an alternative to traditional plant testing for diagnosing crop N status. The objectives of this study were to determine which vegetation indices could be used to estimate N status in winter wheat (Triticum aestivum L.) under high N input conditions, develop models to predict winter wheat N uptake using spectral vegetation indices and validate the models with data from farmers' fields. An N rate experiment and a variety-N experiment were conducted in Huimin, Shandong Province from 2005/2006 to 2006/2007 to develop the models. Positive linear relationships between simple ratio vegetation indices (red vegetation index, RVI and green vegetation index, GVI) and N uptake were observed independent of growth stages and varieties (R-2, 0.48-0.74). In contrast, the relationships between normalized difference vegetation indices (NDVI and GNDVI), red and green normalized difference vegetation index (RGNDI), and red and green ratio vegetation index (RGVI) were exponentially related to N uptake (R-2, 0.43-0.79). Subsequently, 69 farmers' fields in four different villages were selected as datasets to validate the developed models. The results indicated that the prediction using RVI had the highest coefficient of determination (R-2, 0.60), the lowest root mean square error (RMSE, 39.7 kg N ha(-1)) and relative error (RE, 30.5%) across different years, varieties and growth stages. We conclude that RVI can be used to estimate nitrogen status for winter wheat in over-fertilized farmers' fields before heading. (C) 2007 Elsevier B.V. All rights reserved.

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