Nanjing Agricultural University

Jifeng Ma

Yan Zhu

Yongchao Tian

Xia Yao

Yu Zhang

Hengbiao Zheng

Tao Cheng

Caili Guo

Wei Li

Dong Zhou

Weixing Cao

Chongya Jiang

Xiaohu Zhang

Tai Guo

Xue Wang

Weixin Cao

Dong Li

Hongxu Ai

Jie Zhu

Rui Huang

A method for improving estimation of leaf area index in an early growth stage of wheat based on red-edge bands of Sentinel-2 satellite images includes the following steps: acquiring field background spectrum and wheat canopy spectrum information by means of Sentinel-2; respectively acquiring a 'straw-soil' spectrum and a “wheat-straw-soil” spectrum, and calculating slopes of red-edge areas of the “straw-soil” spectrum and the “wheat-straw-soil” spectrum; calculating a tangent function SATF corrected by a background adjustment coefficient α; constructing a wheat LAI estimation model based on a spectral variable SATF; performing preliminary screening on the LAI estimation model using cross validation; and then testing the screened model with independent data.

Method for improving estimation of leaf area index in early growth stage of wheat based on red-edge band of sentinel-2 satellite image

A field wheat stem tillering number extraction method, including: acquiring field wheat point clouds by means of a LiDAR, and extracting any row of wheat point clouds in a research area; projecting a Y axis to a plane, and retaining an X and Z axis; applying adaptive layering to obtain number of clusters of the wheat row; applying hierarchical clustering analysis to obtain tillering number of each wheat cluster; and further obtaining stem tillering number of the whole wheat row, so as to extract a field wheat stem tillering number. The feasibility of an algorithm is verified by comparing the wheat stem tillering number extracted by means of the method with an actually measured field stem tillering number, and the method realizes rapid, accurate and nondestructive extraction of a large-field crop stem tillering number and provides theoretical basis and technical support for extraction of the field wheat stem tillering number.

Method of extracting number of stem and tillering for wheat under field condition

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Nanjing, China

Jifeng Ma