Estimation of relative water content in rice panicle based on hyperspectral vegetation indexes under water saving irrigation. Issue 2 (7th February 2019)

• Record Type: Journal Article
• Authors: Zhang, Zhen; Lou, Yunsheng; Li, Rui; Ma, Li; Li, Jun
• Is Part Of: Spectroscopy letters. Volume 52:Issue 2(2019)
• Page Start: 150
• Page End: 158
• Publication Date: 2019-02-07
• Subjects: Rice -- relative water content -- vegetation index -- physiological maturity -- water saving irrigation; Spectrum analysis -- Periodicals; 543.5
• DOI: 10.1080/00387010.2019.1594309
• Languages: English
• ISSNs: 0038-7010

Abstract

Abstract: Determining grain water content is a traditional method to quantify maturity, but this method is laborious. Ground-based remote sensing with rapidness and flexibility has been widely used in evaluating rice growth, but less attention has been paid to predicting physiological maturity. A field experiment with rice was conducted to investigate the effects of water saving irrigation on physiological maturity based on hyperspectral data. The results indicated that, with higher coefficients of determination ( R 2 = 0.93 and 0.87, respectively), higher residual prediction deviation (RPD = 3.54 and 2.58, respectively) and lower root mean square error (RMSE = 2.88 and 4.43, respectively) among the tested models, R 1654 / R 662 and R 546 / R 562 were suggested as the optimal indexes for monitoring relative water content in rice panicle under flooding and wetting conditions, respectively. This finding is helpful in providing reference for monitoring rice physiological maturity.