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Oryza sativa plant traits conferring competitive ability against weeds

Published online by Cambridge University Press:  20 January 2017

H. Ni ,
K. Moody ,
R. P. Robles ,
E. C. Paller Jr.  and
J. S. Lales
K. Moody
Affiliation:
International Rice Research Institute, Los Baños, Laguna, Philippines
R. P. Robles
Affiliation:
Department of Agronomy, University of the Philippines, Los Baños, Laguna, Philippines
E. C. Paller Jr.
Affiliation:
Department of Agronomy, University of the Philippines, Los Baños, Laguna, Philippines
J. S. Lales
Affiliation:
Department of Agronomy, University of the Philippines, Los Baños, Laguna, Philippines
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Abstract

This study was conducted in lowland fields at the International Rice Research Institute in the 1994 wet season and the 1995 dry season to determine Oryza sativa plant traits that confer competitive ability against weeds when pregerminated seeds are sown on puddled soil. Initial biomass (IB), crop growth rate (CGR), leaf area index (LAI), and biomass at tillering of O. sativa plants were associated with their competitiveness against weeds, whereas relative growth rate, net assimilation rate, and tillering capacity of O. sativa were not. Biomass at tillering affected weed biomass directly, and IB, CGR, and LAI indirectly affected weed biomass through O. sativa biomass. Biomass at tillering was the best predictor of modern cultivar competitiveness against weeds.

Keywords

Oryza sativa L., riceInterferencephenotypeweed suppression
Type
Research Article
Information
Weed Science , Volume 48 , Issue 2 , April 2000 , pp. 200 - 204
Copyright
Copyright © Weed Science Society of America 

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