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Reciprocal Yield Analysis of Red Rice (Oryza sativa) Competition in Cultivated Rice

Published online by Cambridge University Press:  12 June 2017

Dan J. Pantone  and
John B. Baker
Dan J. Pantone
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803
John B. Baker
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

Four years of field experiments were used to assess the competitive ability of red rice, a weedy variety of rice, and ‘Mars’, a cultivar of rice. Red rice was the dominant competitor each of the 4 yr, and an average of one red rice plant reduced Mars grain yield per plant equal to the effect of four Mars plants. Intervarietal competition was more important than intravarietal competition for Mars, whereas the reverse was true for red rice. The product of the coefficients for intravarietal competition did not significantly exceed the product of the coefficients for intervarietal competition, indicating that the two varieties were competing for the same resources. Using the reciprocal yield model coefficients from 1989, grain yield losses of Mars, due to red rice densities of 4, 16, 25, and 300 plants m−2, were predicted to approximate 13, 37, 48, and 92%, respectively, at a fixed cultivar density of 100 plants m−2.

Keywords

Red rice, Oryza sativa L. # ORYSArice, Oryza sativa L. ‘Mars’Weed biologyinterferenceinverse linear modelORYSA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 39 , Issue 1 , March 1991 , pp. 42 - 47
Copyright
Copyright © 1991 by the Weed Science Society of America 

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