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Detection of Rice Leaf SPAD and Blast Disease Using Integrated Aerial and Ground Multiscale Canopy Reflectance Spectroscopy

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  • Aichen Wang

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
    Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China)

  • Zishan Song

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Yuwen Xie

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Jin Hu

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Liyuan Zhang

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
    Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China)

  • Qingzhen Zhu

    (School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
    Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China)

Abstract

Rice blast disease is one of the major diseases affecting rice plant, significantly impacting both yield and quality. Current detecting methods for rice blast disease mainly rely on manual surveys in the field and laboratory tests, which are inefficient, inaccurate, and limited in scale. Spectral and imaging technologies in the visible and near-infrared (Vis/NIR) region have been widely investigated for crop disease detection. This work explored the potential of integrating canopy reflectance spectra acquired near the ground and aerial multispectral images captured with an unmanned aerial vehicle (UAV) for estimating Soil-Plant Analysis Development (SPAD) values and detecting rice leaf blast disease in the field. Canopy reflectance spectra were preprocessed, followed by effective band selection. Different vegetation indices (VIs) were calculated from multispectral images and selected for model establishment according to their correlation with SPAD values and disease severity. The full-wavelength canopy spectra (450–850 nm) were first used for establishing SPAD inversion and blast disease classification models, demonstrating the effectiveness of Vis/NIR spectroscopy for SPAD inversion and blast disease detection. Then, selected effective bands from the canopy spectra, UAV VIs, and the fusion of the two data sources were used for establishing corresponding models. The results showed that all SPAD inversion models and disease classification models established with the integrated data performed better than corresponding models established with the single of either of the aerial and ground data sources. For SPAD inversion models, the best model based on a single data source achieved a validation determination coefficient ( R c v 2 ) of 0.5719 and a validation root mean square error (RMSECV) of 2.8794, while after ground and aerial data fusion, these two values improved to 0.6476 and 2.6207, respectively. For blast disease classification models, the best model based on a single data source achieved an overall test accuracy of 89.01% and a Kappa coefficient of 0.86, and after data fusion, the two values improved to 96.37% and 0.95, respectively. These results indicated the significant potential of integrating canopy reflectance spectra and UAV multispectral images for detecting rice diseases in large fields.

Suggested Citation

  • Aichen Wang & Zishan Song & Yuwen Xie & Jin Hu & Liyuan Zhang & Qingzhen Zhu, 2024. "Detection of Rice Leaf SPAD and Blast Disease Using Integrated Aerial and Ground Multiscale Canopy Reflectance Spectroscopy," Agriculture, MDPI, vol. 14(9), pages 1-20, August.
  • Handle: RePEc:gam:jagris:v:14:y:2024:i:9:p:1471-:d:1466316
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    References listed on IDEAS

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    1. Víctor Martínez-Martínez & Jaime Gomez-Gil & Marley L Machado & Francisco A C Pinto, 2018. "Leaf and canopy reflectance spectrometry applied to the estimation of angular leaf spot disease severity of common bean crops," PLOS ONE, Public Library of Science, vol. 13(4), pages 1-18, April.
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