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Effect of Corn Population and Simazine on Weed Growth¹

Five rates of 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) were applied both preemergence and at lay-by to five levels of corn (Zea mays L.) populations. Increased weed control resulted from the combination of corn competition and the herbicide simazine. This increased weed control may be associated with a competitive advantage given to the corn and/or the effect of shading upon the retention of the herbicide on the soil surface. Corn 46 cm tall significantly reduced weed growth with additional suppression obtained from simazine. It is proposed that shading may reduce soil temperatures, which in turn may reduce the loss of simazine through photodecomposition and/or volatilization.

Key Words: shading • competition • Zea mays L

² Former Graduate Assistant (now in charge, Witchweed Laboratory, ARS, USDA, Whiteviile, N. C.). and former Professor of Crop Science, (now Director Plant Science Research at Eli Lilly & Co., Greenfield, Ind.).

Received for publication June 1, 1967.