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- W2024715152 abstract "Spectral reflectance factors were measured for paddy rice canopies in the visible (VIS), reflective near-infrared (NIR), and mid-infrared (MIR) wavelength regions. Radiometric and agronomic measurements were performed every other week from 45 days before heading to 64 days after heading in early- and late-planted rice plots consisting of five cultivars. The relation between radiometric data an and the leaf area index (LAI) and above-ground dry phytomass (GDM) was investigated during 11 development periods of 10-day intervals. Reflectance values in the VIS bands were lowest when the panicles emerged, whereas the values at 840 and 1100 nm increased until the time when the grains reached maturity. Reflectances at 1200 and 1650 nm were similar in pattern but less pronounced than at 840 and 1100 nm. Ratios using VIS and NIR reflectances (R840 / R560, R1100 / R840) for the whole season were associated with 71of the variation in LAI, while the difference between NIR and MIR reflectances (R1100 - R1650, R1100 - R1200) combined with ratios using VIS and NIR reflectances (R840 / R560, R1100 / R840) was associated with 93% of the variation in GDM of the paddy rice canopies. Thus, the use of mid-infrared wavelengths may result in improved estimates of seasonal GDM." @default.
- W2024715152 created "2016-06-24" @default.
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- W2024715152 date "1989-02-01" @default.
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- W2024715152 title "Seasonal visible, near-infrared and mid-infrared spectra of rice canopies in relation to LAI and above-ground dry phytomass" @default.
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- W2024715152 doi "https://doi.org/10.1016/0034-4257(89)90011-4" @default.
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