Radiometric estimates of grain yields related to crop Aboveground Net Production (ANP) in paddy rice

Crop aboveground net production (ANP) is a major factor for determining the total biomass and closely related to the amount of grain production at each development state. Spectral reflectance was measured in paddy field (Ilpum var.) to interpret grain yield from satellite image using the relations between agronomic parameters such as LAI and ANP. LANDSAT TM equivalent band set was created by integrating measured spectral reflectance values to the real TM band range. The authors made polynomial functions of spectral reflectance on two wavelength ranges, VIS (0.50-0.68 μm) and NIR (0.69-1.00 μm), of each development state. As a result of correlation analysis between the LANDSAT TM equivalent bands, agronomic parameters, and multi-channel vegetation indices, both ANP and LAI of paddy rice could be estimated by TM equivalent bands and vegetation indices, functionally. Rice ANP and LAI can be estimated from spectral measurements. These estimates can then be used to forecast final grain yield