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Relation of Lime and Preemergence Herbicides to Yields of Cotton and Weeds¹

The growth of cotton and weeds on Wickham sandy loam was used to evaluate the effectiveness of pre-emergence herbicides on limed and unlimed soil. Diuron, cotoran, prometryne, and trifluralin were more effective in controlling weeds in limed soil than in unlimed soil, primarily because of weed growth. Although there were no significant differences in weed yields among the different herbicides, as a group they were more consistent in behavior on unlimed soil than on limed soil. The herbicides were responsible for a highly significant increase in the yields of seed cotton over yields obtained with no herbicides. Competition between weeds and cotton for moisture and fertility was largely ruled out in this difference. However, delayed maturity of the cotton indicated that weeds probably affected the air, light, and humidity in the crop. The correlation coefficients for yields of cotton with yields of weeds were –0.91** for unlimed soils and –0.67 for limed soils.

² NDEA Fellow and Associate Professor.

Received for publication October 16, 1965.