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The strength of the relationships of corn (Zea mays L.) yield, plant biomass, and leaf N concentration with early‐ to mid‐growing season combined normalized difference vegetation index (NDVI) and plant height measurements has not been adequately documented. The objective of this study was to compare the strength among the relationships of corn yield, plant biomass, and leaf N with combined and respective NDVI and plant height measurements taken during the early to mid‐season under major cropping systems. Two field N rate response studies in non‐irrigated corn after soybean [Glycine max (L.) Merr.] (CS), non‐irrigated corn after cotton [Gossypium hirsutum (L.)] (CCT), non‐irrigated corn after corn (CC), and irrigated corn after soybean (ICS) were conducted at Jackson and Milan, TN, from 2008 through 2010. Regressions of corn yield, plant biomass, and leaf N concentration with NDVI × plant height and …