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Winter Wheat Canopy Water Content Monitoring Based on Spectral Transforms and “Three-edge” Parameters

Author

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  • Peng, Zhigong
  • Lin, Shaozhe
  • Zhang, Baozhong
  • Wei, Zheng
  • Liu, Lu
  • Han, Nana
  • Cai, Jiabing
  • Chen, He

Abstract

Suitable spectral monitoring models of canopy water content provide a scientific basis for real-time dynamic, accurate, non-destructive diagnosis over large acreage. This work investigates winter wheat under different water treatments to examine the relationship between canopy water content and spectral reflectance. Principal component regression spectral monitoring models are developed based on the combination of growth stages. The growth stage constraints are divided, and the influence of other background noises is removed to achieve accurate and stable spectral monitoring results of canopy water content at all growth stages. The following main conclusions are derived. (1) At the stem elongation–booting, booting–milking, and milking–ripening stages and during the entire growth period, the spectral transforms with the highest correlation with winter wheat canopy water content are the first-order derivative, division by R930, division by R450-750, and division by R930, respectively; the corresponding sensitivity bands are 758, 759, 690, and 759 nm, respectively. At the stem elongation–booting, booting–milking, and milking–ripening stages and during the entire growth period, the “three-edge” parameters with the highest correlation with winter wheat canopy water content are Rg/Rr, SDr/Sdy, (Rg − Rr)/(Rg + Rr), and (SDr-SDb), respectively. (2) In accordance with the rationale that the spectral parameters should have the highest correlation coefficients with canopy water content at each growth stage, combinational models of canopy water content that are specific to individual growth stages are developed based on spectral transforms or “three-edge” parameters. Compared with the optimal single-parameter regression model, the combinational models significantly improve the estimation accuracy of canopy water content at each growth stage. (3) Monitoring models based on principal component analysis are constructed with comprehensive spectral information. These models can improve the monitoring accuracy at other growth stages, especially at the stem elongation–booting stage, compared with combinational models developed based on spectral transforms or “three-edge” parameters.

Suggested Citation

  • Peng, Zhigong & Lin, Shaozhe & Zhang, Baozhong & Wei, Zheng & Liu, Lu & Han, Nana & Cai, Jiabing & Chen, He, 2020. "Winter Wheat Canopy Water Content Monitoring Based on Spectral Transforms and “Three-edge” Parameters," Agricultural Water Management, Elsevier, vol. 240(C).
    • Handle: RePEc:eee:agiwat:v:240:y:2020:i:c:s0378377420300962
    DOI: 10.1016/j.agwat.2020.106306
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    1. El-Hendawy, Salah E. & Al-Suhaibani, Nasser A. & Elsayed, Salah & Hassan, Wael M. & Dewir, Yaser Hassan & Refay, Yahya & Abdella, Kamel A., 2019. "Potential of the existing and novel spectral reflectance indices for estimating the leaf water status and grain yield of spring wheat exposed to different irrigation rates," Agricultural Water Management, Elsevier, vol. 217(C), pages 356-373.
    2. Krishna, Gopal & Sahoo, Rabi N. & Singh, Prafull & Bajpai, Vaishangi & Patra, Himesh & Kumar, Sudhir & Dandapani, Raju & Gupta, Vinod K. & Viswanathan, C. & Ahmad, Tauqueer & Sahoo, Prachi M., 2019. "Comparison of various modelling approaches for water deficit stress monitoring in rice crop through hyperspectral remote sensing," Agricultural Water Management, Elsevier, vol. 213(C), pages 231-244.
    3. El-Hendawy, Salah E. & Hassan, Wael M. & Al-Suhaibani, Nasser A. & Schmidhalter, Urs, 2017. "Spectral assessment of drought tolerance indices and grain yield in advanced spring wheat lines grown under full and limited water irrigation," Agricultural Water Management, Elsevier, vol. 182(C), pages 1-12.
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    1. Ren, Shoujia & Guo, Bin & Wang, Zhijun & Wang, Juan & Fang, Quanxiao & Wang, Jianlin, 2022. "Optimized spectral index models for accurately retrieving soil moisture (SM) of winter wheat under water stress," Agricultural Water Management, Elsevier, vol. 261(C).

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