摘要
【目的】研究根据冬小麦关键生育期生长需求解析氮丰缺识别和精准定量施氮模型,实现量化施氮,为冬小麦智慧施肥种植的关键技术提供参考。【方法】利用ASD HH2高光谱仪获取不同施氮量的冬小麦冠层反射率,记录叶绿素浓度和产量等信息。通过冬小麦冠层反射率提取14种植被指数,选择最优表征植株氮状况的植被指数,分析施氮量、植被指数和冬小麦的产量之间的关系,构建基于植被指数变量施氮模型。【结果】叶绿素浓度可以准确反映冬小麦的生长状况和施氮效果,不同的施氮量下冬小麦的冠层反射率数据差异显著;归一化植被指数NDVI的相关性好,相关系数达到0.705,较好反映了冬小麦冠层氮素效应的情况;构建了基于NDVI的冬小麦孕穗期变量施氮模型,即N_(r)=700.59×NDVI^(2)-1693.46×NDVI+955.92。【结论】利用ASD HH2获取高光谱数据构建冬小麦施氮模型与方法。
【Objective】The objective of this study is to identify and quantitatively analyze nitrogen abundance and deficiency according to the growth requirements of winter wheat during the key growth periods,so as to realize quantitative nitrogen fertilization,which is the key technology that should be solved in precise fertilization and intelligent planting.【Methods】ASD HH2 hyperspectrometer was used to obtain the reflectance of winter wheat canopy with different nitrogen application rates,and the chlorophyll concentration and yield were recorded.According to the reflectance of the winter wheat canopy,14 vegetation indices were extracted,and the vegetation index that best characterized the nitrogen status of plants was selected,and a nitrogen application model based on vegetation index variables was constructed according to the relationship between nitrogen application rate,vegetation index and winter wheat yield.【Results】(1)Chlorophyll concentration could accurately reflect the growth status and nitrogen application effect of winter wheat,and there were significant differences in the canopy reflectance data of winter wheat under different nitrogen application rates.(2)Correlation analysis showed that the normalized vegetation index NDVI had a good correlation coefficient of 0.705,which better reflected the nitrogen effect of winter wheat canopy.(3)A variable nitrogen fertilization model based on NDVI was constructed at booting stage,i.e.,N_(r)=700.59×NDVI^(2)-1693.46×NDVI+955.92,which provided a scientific basis for precise nitrogen fertilization of winter wheat.【Conclusion】The hyperspectral data obtained by ASD HH2 were used to construct a model and method of nitrogen fertilization in winter wheat,which provided an important reference for the in-depth study of precision fertilization of winter wheat.
作者
陈荣
赖宁
耿庆龙
李永福
信会男
吕彩霞
李娜
陈署晃
CHEN Rong;LAI Ning;GENG Qinglong;LI Yongfu;XIN Huinan;LYU Caixia;LI Na;CHEN Shuhuang(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;Institute of Soil,Fertilizer and Agricultural Water Conservation,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China)
出处
《新疆农业科学》
CSCD
北大核心
2024年第11期2705-2712,共8页
Xinjiang Agricultural Sciences
基金
新疆小麦产业技术体系(XJARS-01-21)
新疆维吾尔自治区自然科学基金面上基金(2023D01A95)
农业科技创新稳定支持专项(xjnkywdzc-2023002,xjnkywdzc-2023007-3)
新疆维吾尔自治区重大专项(2022A02011-2)
新疆农业科学院自主培育专项(xjnkycxzx-2022004)。
关键词
遥感
植被指数
施氮模型
remote sensing
vegetation index
nitrogen application model
