Black Layer Development in Corn1

Abstract A study was made to determine the relationships between visual kernel black layer development, dry matter accumulation, and moisture level. Kernels taken from the same plants every 3 days were rated as to their visual black layer phase of development from plants approaching maturity. Remaining kernels from the same sample were dried and evaluated for dry matter and moisture content. Peak dry matter accumulation coincided with initial occurrence of visual black layer formation. Weight lost by kernels from initial visual black layer development to completed black layer development was significant. Kernel moisture declined significantly during black layer development. Black layer mature kernels had moisture levels that differed statistically between varieties and within a variety planted at different dates.