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Path Analysis of Red Rice (Oryza sativa L.) Competition by Cultivated Rice

Published online by Cambridge University Press:  12 June 2017

D. J. Pantone ,
J. B. Baker  and
P. W. Jordan
D. J. Pantone
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803
J. B. Baker
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803
P. W. Jordan
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803
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Abstract

During 1985 to 1989, a series of field experiments were conducted at the Rice Research Station in Crowley, LA. Path analysis was employed to evaluate the competitive interaction between a weed (red rice) and cultivated rice (Mars). The path analysis quantified direct effects of red rice and Mars rice densities on the yield components (grain weight, percent filled florets, number of florets panicle−1, and panicles plant−1) of red rice and Mars rice. The model illustrated the direct and indirect effects of the yield components on fecundity and grain yield plant−1. The direct effects of Mars and red rice densities on panicles plant−1 and florets panicle−1 were always negative. In contrast, the effects of density on percent filled florets and grain weight varied from positive to negative and were relatively small, implying that they were determined primarily by density-independent factors. Path analysis indicated that the number of panicles plant−1 and florets panicle−1 were the most important yield components determining the responses of fecundity and grain yield to competition.

Keywords

Red rice, Oryza sativa #3 ORYSArice, Oryza sativa L.‘Mars'Correlation coefficient partitioningdirect effectsindirect effectsinterferencemodelingpath coefficientsregression analysisyield componentsweed competitionweed density
Type
Special Topics
Information
Weed Science , Volume 40 , Issue 2 , June 1992 , pp. 313 - 319
Copyright
Copyright © 1992 by the Weed Science Society of America 

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