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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
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