Abstract
In order to elucidated characteristics of spectrum of cotton leaf infected with Verticillium wilt and estimated its severity level (SL) to provide theoretic foundation for further monitoring cotton Verticillium wilt at large scale using airborne and airspace remote sensing. The spectrum reflectance of cotton single leaf infected with Verticillium wilt was measured in cotton disease nursery and field at different growth phases, meanwhile, SL of single leaf infected with Verticillium wilt was investigated. The methods of first derivative spectraum were used to estimate accurately disease of cotton with Verticillium wilt when compared with the reflectance spectrum of different single leaf infected of Verticillium wilt. The results indicated that Spectral characteristic of cotton leaf of Verticillium wilt had better regularity with the increase of SL in different periods and varieties. Spectral reflectance increased significantly at visible light region (400–700nm) and near -infrared region (700–1300nm) with the increase of the SL, and specially signification at blue — violet to red regions(525–680nm). when SL got 25%, cotton leaf of Verticillium wilt could be used as a watershed and diagnosed index in early time. There were evident different characteristics of first derivative spectra in these disease leave, it changed significantly in red edge ranges(680–780nm) with different disease level, derivative spectra of red edge swing decreased, and red edge position equal moved to the blue. The thesis indicated that 434–724nm and 909–1600nm were selected out as sensitive bands region to SL of single leaf. Some inversion models for estimating cotton leaf diseased level of Verticillium wilt all reached the best significantly level. The model in which the first derivative spectra at 723nm could invert accurately the cotton leaf SL, and it may be used to forecasting the position of cotton leaf infected with Verticillium wilt in quantitatively.
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© 2009 Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg
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Chen, B., Wang, KR., Li, SK., Sui, XY., Wang, FY., Bai, JH. (2009). Spectral Characteristics of Cotton Infected with Verticillium Wilt and Severity Level of Disease Estimated Models. In: Cao, W., White, J.W., Wang, E. (eds) Crop Modeling and Decision Support. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-01132-0_36
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DOI: https://doi.org/10.1007/978-3-642-01132-0_36
Publisher Name: Springer, Berlin, Heidelberg
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