Yield and Nitrogen Content of Wheat and Sorghum Treated with Different Rates of Nitrogen Fertilizer and Herbicides1

Abstract

AbstractStudies were conducted during 1968 and 1969 at Belleville, Illinois, to determine the effects of simazine (2‐chloro‐4,6‐bis (ethylamino)‐s‐triazine), atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐s‐triazine), and N level on production of grain and crude protein in wheat (Triticum aestivum (L.) and grain sorghum (Sorghum bicolor (L.) Moench). In 1968, 1.12 kg/ha simazine increased the grain yield and crude protein content in sorghum grain when the plants were under N stress. In 1969, the N stress was less pronounced and neither simazine nor atrazine increased grain yield or total crude protein in wheat or sorghum. Simazine increased the percentage crude protein in leaf samples from the sorghum plants fertilized with three N levels in 1969.The application of 112 and 224 kg/ha of N to grain sorghum in 1969 increased the grain yield by 25 and 22%, respectively, and increased the total protein content of the grain by 49 and 52%, respectively, over the control plots not fertilized with N.