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Estimation of Nitrogen Uptake and Biomass of Rice (Oryza sativa L.) Using Ground-based Remote Sensing Techniques
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 Title & Authors
Estimation of Nitrogen Uptake and Biomass of Rice (Oryza sativa L.) Using Ground-based Remote Sensing Techniques
Gong, Hyo-Young; Kang, Seong-Soo; Hong, Soon-Dal;
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This study was conducted to evaluate the usefulness of ground-based remote sensing for the estimation of rice yield and application rate of N-fertilizer during growing season. Dongjin-1, Korean cultivar of rice was planted on May 30, 2006 and harvested on October 9, 2006. Chlorophyll content and LAI (leaf area index) were measured using Minolta SPAD-502 and AccuPAR model LP-80, respectively. Reflectance indices were determined with passive sensors using sunlight and four types of active sensors using modulated light, respectively. Reflectance indices and growth rate were measured three times from 29 days to 87 days after rice plating and at harvesting day. The result showed that values of growing characteristics and reflectance indices were highly correlated. Growing characteristics to show significant correlation with reflectance indices were in order of followings: fresh weight > N uptake > dry weight > height > No. of tiller > N content. Chlorophyll contents measured by chlorophyll meter (SPAD 502) showed high correlation with nitrogen concentration (r
Biomass;Ground-based remote sensor;NDVI;Nitrogen uptake;Rice;
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