Cover Crop Mixtures in Corn and Wheat on Topographically Variable Terrain.

Abstract

Cover crop mixtures seeded after winter wheat in August had much greater biomass in late fall compared with cover crops inter-seeded in corn in late June. • Competition for light and soil moisture reduced cover crop establishment and growth in corn and resulted in absence of the expected depression>slope~summit biomass gradient, with the exception of tillage radish in the WK treatment. • Cover crop mixtures planted after winter wheat provided good weed suppression. • In drier summer environments (as in Ukraine), inter-seeding of WH and WK cover crops in corn reduced yield in the topographical depressions.