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Effects of Annual Grass Weeds on the Yield of Corn¹

Synopsis: Corn yield reductions resulting from mature foxtail infestations averaged 14, 10 and 5 bushels per acre respectively, with applications of 0, 70 and 140 pounds of elemental nitrogen per acre. Corn yields were increased 2 to 3 times more than foxtail by the fertilizer applications. Possible effects of uncontrolled factors are recognized.

² Associate Professor of Botany and Plant Pathology, and Farm Crops.

Received for publication March 23, 1957.