Submitted to: Research Day Abstracts: Regional Universities Research Day
Publication Type: Abstract Only
Publication Acceptance Date: 9/1/2002
Publication Date: 11/15/2002
Citation: BIDLACK, J., MIDDICK, A., GREER, K., SHANTZ, D., PETERSEN, E., JONES, K., SUNG, M., MACKOWN, C.T., RAO, S.C. WEED CONTROL IN A PIGEON PEA - WHEAT ROTATION: FINAL REPORT OF A THREE YEAR STUDY. RESEARCH DAY ABSTRACTS: REGIONAL UNIVERSITIES RESEARCH DAY. 2002. Abstract No. MB5. p. 70. Interpretive Summary: Abstract only
Technical Abstract: Pigeon pea [Cajanus cajan (L.) Millsp.] has potential as a hay, grain, and green manure crop in the southern Great Plains. Rapid growth of pigweed [Amaranthus retroflexus (L.)] adversely affects establishment of slower-growing pigeon pea. A 3-yr study was conducted from June 1998 through June 2001 in El Reno, OK to assess effects of weed control on pigeon pea productivity and possible residual effects on winter wheat. 'Georgia-2' pigeon peas were grown during the summers of 1998-2000, followed by wheat in 1999-2000 and 2000-2001. Ten treatment plots were replicated three times and arranged in a randomized complete block design with herbicide treatments located in the same plots each year. Weed control began just after pigeon pea emergence. Biomass of pigeon peas and weeds were measured for two rates of Authority, Lexone, Cadre, and Poast; plus hand-weeded and weedy-check controls. Herbicide treatments consistently and significantly affected biomass of pigeon pea and the following wheat crop each year. Pigeon peas treated with the high rate of Cadre had the greatest biomass, and weed suppression was just as effective as hand-weeded plots, but growth of wheat was severely damaged and was the least of all treatments. Among other treatments, hand weeding, as well as applications of Authority or Lexone, resulted in higher pigeon pea biomass compared with weedy-check and Poast treatments. Authority and Lexone suppressed pigweed in pigeon peas at or near the same level as hand-weeded plots without significantly harming the following wheat crop.