Effect of water deficit on rice-weed competition under greenhouse conditions
1990
Janiya, J.D. | Moody, K. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Rice (Oryza sativa L.) plant height, dry matter weight, leaf water potential (LWP), and grain yield decreased in the presence of weeds and with prolonged water deficit. The greatest reduction in these growth parameters occurred when rice competed with Echinochloa colona (L.) Link. Rice population density did not affect plant height and dry weight of Amaranthus spinosus L. and plant height of E. colona. However, dry weight of E. colona and the height and dry weight of Rottboellia cochinchinensis (Lour.) W.D. Clayton were reduced at higher rice densities. A water deficit of more than 14 days, when imposed at 15 days after emergence, reduced the height and dry weight of the weeds. Rice LWP decreased with increasing weed density and prolonged water deficit and was always lower than that of the weeds. Rice was more competitive than the weeds at the 1:3 rice-weed density combination when there was sufficient moisture but with water deficit, the weeds were more competitive than the rice plants.
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