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Herbicides in Narrow-row Cotton Culture

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.

Key Words: Pigweed (Amaranthus sp.) control • DCPA • Trifluralin • Diuron • Norea • Prometryne • Nitralin • Alachlor • Fluometuron • Herbicide incorporation

² Professor, Texas A & M University, U. S. Department Agriculture, Southwestern Great Plains Research Center, Bushland, Texas; and Assistant Professor, Texas A & M University Agricultural Research and Extension Center, Lubbock, Texas, respectively.

Received for publication November 14, 1970.