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Rice cultivar differences in suppression of barnyardgrass (Echinochloa crus-galli) and economics of reduced propanil rates

Published online by Cambridge University Press:  20 January 2017

David R. Gealy ,
Eric J. Wailes ,
Leopoldo E. Estorninos Jr.  and
Rebecca Salome C. Chavez
Eric J. Wailes
Affiliation:
Department of Agricultural Economics and Agribusiness, University of Arkansas, Agriculture Building 217, Fayetteville, AR 72701
Leopoldo E. Estorninos Jr.
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
Rebecca Salome C. Chavez
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Dale, Bumpers National Rice Research Center, 2890 Hwy 130 East, P.O. Box 1090, Stuttgart, AR 72160
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Abstract

Field studies were conducted to compare the barnyardgrass suppression by four U.S. (‘Starbonnet’, ‘Kaybonnet’, ‘Lemont’, and ‘Cypress’) and three highly competitive, high-yielding Asian cultivars (‘PI 312777′, ‘Guichao’, and ‘Teqing’). The economic consequence of applying less than the recommended propanil rates to these cultivars was also evaluated. Grain yields increased, and barnyardgrass biomass decreased with increasing propanil rates. With or without propanil, the Asian rice cultivars consistently suppressed barnyardgrass more and consequently produced higher grain yields than did U.S. cultivars. The economic benefit derived from propanil application was less for Asian than for U.S. cultivars. Asian cultivars produced higher rough rice yields, resulting in higher net returns (not adjusted for milling) than did the commercial cultivars, but this advantage was usually reduced when adjusting for their lower milling yields. These results suggest that growing weed-suppressive Asian rice cultivars in conjunction with reduced herbicide rates could be an effective and economical weed management strategy for rice in the southern United States. However, first, their plant type and grain quality characteristics must be improved.

Keywords

Propanilbarnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGrice, Oryza sativa L.Allelopathic ricebentazoncompetitiondrill-seeded riceeconomic returngross returnindica riceinterferencenet returntropical japonica rice
Type
Research Article
Information
Weed Science , Volume 51 , Issue 4 , August 2003 , pp. 601 - 609
Copyright
Copyright © Weed Science Society of America 

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