2006 Volume 44 Issue 3 Pages 207-214
In this research, growth information of wheat was acquired using multi-spectral imaging sensor (MSIS) mounted on an unmanned helicopter and application of variable rate fertilizer based on this growth information. Growth information of the wheat obtained from normalized difference vegetation index (NDVI) value. NDVI value was calculated by image processing of the acquired image. Calculated NDVI was used to generate a map. This map was used for the application of the variable rate fertilizer in the wheat field. Moreover, the growth variation of the wheat by variable rate fertilizer was analyzed. The variability of SPAD was low before the variable rate fertilizer. Comparison of variable rate and uniform rate fertilizer has been carried out. The cross-correlation coefficient of SPAD and NDVI was low in the variable rate fertilizer compare with uniform rate fertilizer section. There is no correlation before and after variable rate fertilizer because the variable rate fertilizer influences the SPAD and NDVI of the wheat. The protein variability of the variable rate fertilizer section is less than the uniform rate fertilizer section. The yield in variable rate fertilizer section that has been fertilized with nitrogenous fertilizer of 1.7 N-kg 10 acre-1 is almost the same with the uniform rate fertilizer section.
