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Broadleaf Signalgrass (Brachiaria platyphylla) Duration of Interference in Rice (Oryza sativa)

Published online by Cambridge University Press:  12 June 2017

John T. McGregor Jr. ,
Roy J. Smith Jr.  and
Ronald E. Talbert
John T. McGregor Jr.
Affiliation:
U.S. Dep. Agric., Stuttgart, AR 72160
Roy J. Smith Jr.
Affiliation:
U.S. Dep. Agric., Stuttgart, AR 72160
Ronald E. Talbert
Affiliation:
Dep. Agron., Altheimer Lab., Univ. Arkansas, Fayetteville, AR 72703
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Abstract

Interference from broadleaf signalgrass at a density of 180 plants/m2 reduced rough rice yields of ‘Bond’ a maximum of 48% at 95 days after rice emergence and reduced yields of ‘Mars' a maximum of 21% from season-long interference. Interference durations of 40 days or longer reduced the panicles/m2, culms/m2, and plant height of rice. Straw dry weight of Bond and Mars was reduced 41 and 26%, respectively, from season-long interference. Increased durations of weed interference did not affect the number of spikelets/panicle, percent filled spikelets, rough kernel weight, or head rice yield of either cultivar. Broadleaf signalgrass produced less dry weight and fewer panicles/m2 when grown with Mars than with Bond.

Keywords

Broadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash # BRAPPrice, Oryza sativa L.Rice cultivarsyield componentsBRAPP
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 6 , November 1988 , pp. 747 - 750
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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