Abstract
On loamy sand soil application of several pre‐emergence herbicides followed by sprinkle irrigation or rainfall resulted in good control of a mixture of several Amaranthus (pigweed) species in narrow‐row (18 to 25 cm) cotton (Gossypium hirsutum L.) without causing crop injury. On fine sandy loam soil preplant herbicide applications, followed by incorporation with a spike‐toothed harrow, gave good weed control without cotton injury. Deep incorporation of preplant herbicides on fine sandy loam caused cotton injury. On loam soil, shallow incorporation with a grain drill during the planting operation or deeper incorporation with a tandem disk gave good pigweed control without cotton injury. Herbicide rates required for control of pigweed in narrow‐row cotton were comparable to those required for weed control in conventional cultivated cotton on the same soil types.
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