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Preplant Application of Herbicides for Weed Control in Grain Sorghum¹

At the time these studies were initiated, there was no effective, safe method of applying herbicides prior to planting sorghum (Sorghum bicolor (L.) Moench). Over a 4-year period, preplan! application of herbicides at various times before planting and methods of herbicide incorporation were evaluated for control of pigweed (Amaranthus spp.) and barnyardgrass (Echinochloa crusgalli:(L.) Beauv). Effective preplant herbicides on clay loam soil were terbutryn (2-(tert-butylamino)-4-(ethylamino)-6-(methylthio)-s-triazine), propazine (2-chloro-4,6-bis(isopropylamino)-s-triazine), and mixtures of propazine with either norea (3-hexahydro-4,7-methanoindan-5-yl)-l,l-dimethylurea) or linuron (3-(3,4-dichlorophenyl)-l-methoxy-l-methylurea). In order to prevent crop injury and obtain weed control equal to or better than that obtained with preemergence application, the herbicides had to be applied to beds and incorporated with a rolling cultivator within 2 weeks prior to planting. Incorporation with a tandem disk before bedding resulted in crop injury.

Key Words: Propazine • Terbutryn • Norea • Linuron • Pigweed (Amaranthus spp.) • Barnyardgrass (Echinochloa crusgali: (L.) Beauv.)

² Professor of Weed Science and Technician II, Texas A&M University, USDA Southwestern Great Plains Research Center, Bushland, Texas, and Agronomist, Texas Tech University Research Center, Pantex, Texas.

Received for publication September 22, 1972.