Recommendations for Nitrogen Fertilizer in Winter wheat Based on Nitrogen Nutrition Index
文献类型： 外文期刊
作者： Zhao, Yu 1 ; Li, Zhenhai 1 ; Wang, Jianwen 1 ; Yang, Wude 2 ; Duan, Dandan 1 ; Xu, Xiaobin 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, Beijing, Peoples R China
2.Shanxi Agr Univ, Inst Dry Farming Engn, Jinzhong, Shanxi, Peoples R China
关键词： Nitrogen Nutrition Index; NDVI; Nitrogen recommendations; Winter wheat
期刊名称：2019 8TH INTERNATIONAL CONFERENCE ON AGRO-GEOINFORMATICS (AGRO-GEOINFORMATICS)
ISSN： 2334-3168
年卷期： 2019 年
页码：
收录情况： SCI
摘要： A critical nitrogen (N-c) concentration, defined as the minimum nitrogen (N) concentration required for maximum plant growth, could he used as an intermediate variable between remote sensing data and recommendation for N fertilizer. In this study, the critical N concentration dilution curve was established based on aboveground biomass (AGB) from data at jointing, hooting, anthesis and filling stages. The quantitative correlations between normalized difference vegetation (NDVI) and nitrogen nutrition index (NNI) were established. Finally, an N recommendation model combined with the N fertilizer effect function and NDVI was established and verified by field test data. Results showed that the N concentration of winter wheat decreased gradually during the reproductive growth period, and The plant N concentration could be described by N-c = 6.27*AGB(-0.54), with the R-2 value of 0.80. Moreover, the thresholds of NDVI were 0.87, 0.91, 0.91 and 0.81 at jointing, booting, anthesis and filling stages, respectively, and the amounts of recommending nitrogen fertilizer were 2.63, 10.00, 11.11 and 10.00 kg N/hm(2) when NNI value lowed 1% of corresponding period's thresholds. Field experiments illustrated that jointing and booting stage could be used as the N fertilizer periods to guarantee winter wheat yield, and integrating N-c curve and hyperspectral data had advantages in N fertilizer recommendations.
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