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Integrated Management of Cogongrass [Imperata cylindrica (L.) Rauesch.] in Corn Using Tillage, Glyphosate, Row Spacing, Cultivar, and Cover Cropping

^a International Institute of Tropical Agriculture (IITA), Oyo Road, Ibadan, Nigeria
^b Dep. of Crop Protection, Univ. of Ibadan, Ibadan, Nigeria

View larger version (23K): [in a new window]   Fig. 1. Total monthly precipitation during the growing season (July to October) in 1999 and 2000 and 10-yr mean monthly precipitation (1988–1998).

View larger version (29K): [in a new window]   Fig. 2. Effect of tillage and herbicide on (a) cogongrass biomass and (b) corn grain yield at corn harvest (means of 1999 and 2000 combined). Control = no tillage and no herbicide, TH = tillage and herbicide, T = tillage only, and H = herbicide only (glyphosate). Bars indicate the standard error of the mean.

View larger version (27K): [in a new window]   Fig. 3. Effect of herbicide and cover crop on (a) cogongrass biomass and (b) corn grain yield at corn harvest (means of 1999 and 2000 combined). Control = no glyphosate no cover crop, HC = herbicide and cover crop, C = cover crop only, and H = herbicide only. Bars indicate standard error of the mean.

View larger version (28K): [in a new window]   Fig. 4. Effect of tillage, herbicide, and cover crop on (a) cogongrass biomass and (b) corn grain yield at corn harvest (means of 1999 and 2000 combined). Control = no tillage, no herbicide, and no cover crop; C = cover crop only; T = tillage only; TH = tillage and herbicide; THC = tillage, herbicide, and cover crop; TC = tillage and cover crop; HC = herbicide and cover crop; and H = herbicide only. Bars indicate standard error of the mean.