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Influence of Weed Density and Distribution on Corn (Zea mays) Yield

Mark J. Vangessel, Edward E. Schweizer, Karen A. Garrett and Philip Westra
Weed Science
Vol. 43, No. 2 (Apr. - Jun., 1995), pp. 215-218
Stable URL: http://www.jstor.org/stable/4045486
Page Count: 4
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Influence of Weed Density and Distribution on Corn (Zea mays) Yield
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Abstract

The impact of weed density and weed distribution on irrigated corn yield was investigated in Colorado. Weed densities examined were 0, 33, 50, or 100% of the indigenous weed population. A series of weed distribution treatments were achieved by varying the length of the weed-free and weedy zones within the corn row while maintaining a constant weed population of 33 or 50% of the indigenous weed level. Grain yield was affected by weed density, but not by weed distribution. Each additional weed reduced corn yield 8.5 and 2.3 kg ha⁻¹ in 1991 and 1992, respectively. When corn yields were estimated with a computer weed/corn management model, weed densities 5 to 8 wk after planting provided a better yield reduction estimate than weed densities immediately before harvest.

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