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Applications of an Ecophysiological Model for Irrigated Rice (Oryza sativa)-Echinochloa Competition

Published online by Cambridge University Press:  12 June 2017

John L. Lindquist  and
Martin J. Kropff
John L. Lindquist
Affiliation:
Dep. Agron. Plant Gen., Univ. Minnesota, St. Paul, MN 55108
Martin J. Kropff
Affiliation:
Systems Agron., International Rice Research Institute, P.O. Box 933, 1099, Manila, The Philippines
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Abstract

A simulation model of rice-barnyardgrass competition for light was used for two management applications. First, simulations using 47 weather data sets from four locations in Asia were conducted to evaluate the influence of weather variation on single year economic threshold densities of barnyardgrass. Second, rapid leaf area expansion and leaf area index were evaluated as potential indicators of improved rice competitiveness and tolerance to barnyardgrass. Influence of weather variation on single year economic thresholds was small under the assumption that competition was for light only. Increasing early leaf area expansion rate reduced simulated barnyardgrass seed production and increased single year economic thresholds, suggesting that the use of competitive rice cultivars may reduce the need for chemical weed control. The model predicted that rice leaf area index 70 to 75 d after planting was a good indicator of early leaf area expansion rate.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv., ♯ ECHCGrice, Oryza sativa L. ‘IR72.’Economic thresholdintegrated weed managementweed ecologyIPMweed-crop interferenceECHCG
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 52 - 56
Copyright
Copyright © 1996 by the Weed Science Society of America 

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