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Use of Remote-Sensing Imagery to Estimate Corn Grain Yield

^a USDA-ARS and Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68583
^b Resource21 LLC, Suite 206, 1410 Mayor Magrath Drive South, Lethbridge, AB, T1K 2R3 Canada

View larger version (55K): [in a new window]   Fig. 1. (a) The response of three vegetation indices [normalized difference vegetation index (NDVI), transformed soil adjusted vegetation index (TSAVI), and green normalized difference vegetation index (GNDVI)] vs. seven dates of image acquisition, and the effect of (b) N and (c) hybrids on GNDVI for the 1997 growing season. Important phenological dates for the average of all hybrid and N treatments are also depicted. Standard error values are shown to compare N and hybrid main effects vs. date

View larger version (56K): [in a new window]   Fig. 2. (a) The response of three vegetation indices [normalized difference vegetation index (NDVI), transformed soil adjusted vegetation index (TSAVI), and green normalized difference vegetation index (GNDVI)] vs. nine dates of image acquisition, and the effect of (b) N and (c) hybrids on GNDVI for the 1998 growing season. Important phenological dates for the average of all hybrid and N treatments are also depicted. Standard error values are shown to compare N and hybrid main effects vs. date

View larger version (55K): [in a new window]   Fig. 3. Correlation coefficient values for (a) the association of absolute vegetation indices vs. final grain yield for seven dates in the 1997 season and for (b) normalized vegetation indices and grain yield. Important phenological dates for the average of all hybrid and N treatments are also depicted. Correlation values of 0.217 and 0.283 are significant at the 0.05 and 0.01 levels, respectively

View larger version (64K): [in a new window]   Fig. 4. Correlation coefficient values for (a) the association of absolute vegetation indices vs. final grain yield for nine dates in the 1998 season and for (b) normalized vegetation indices and grain yield. Important phenological dates for the average of all hybrid and N treatments are also depicted. Correlation values of 0.217 and 0.283 are significant at the 0.05 and 0.01 levels, respectively