New Zealand Journal of Agricultural Research abstracts
A non-destructive and real-time method of monitoring leaf nitrogen
status in wheat
X. Yao
W. Feng
Y. Zhu
Y. C. Tian
W. X. Cao*
Department of Agronomy
Nanjing Agricultural University
1 Weigang Road, Nanjing
Jiangsu 210095
PR China
*Corresponding author: caow@njau.edu.cn
Abstract Non-destructive assessment of
leaf nitrogen status
is helpful for precision nitrogen management in crop production. This
study was conducted to quantify the relationships of leaf nitrogen
concentration on a leaf dry weight basis (LNC) and leaf nitrogen
accumulation on a soil area basis (LNA) to canopy hyperspectral
reflectance in wheat. Both LNC and LNA increased with increasing
nitrogen rates, along with marked changes in canopy hyperspectral
reflectance. The sensitive spectral bands for LNC and LNA occurred
mostly within visible light and the near-infrared regions. The
hyperspectral parameters REPle, λo and mND705 were linearly related to
LNC, and MSS-SARVI, FD742, PSSRb and SDr/SDb were linearly related to
LNA. Testing of the REPle and mND705 gave the R2
values of 0.752 and 0.695 between the measured and estimated LNC,
relative errors (RE) of 14.4 and 16.5%, whereas for FD742 and SDr/SDb,
the R2 values were 0.872 and 0.828, with RE of 14.1
and 15.2% respectively.
Keywords hyperspectral remote sensing; leaf nitrogen status;
monitoring model; non-destructive; winter wheat
A07111; Online publication date 31 March 2008; Received and accepted
10 August 2007
New Zealand Journal of Agricultural Research, 2007, Vol. 50:
935–942
0028–8233/07/5005–0935 © The Royal Society of New Zealand 2007
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