Abstract
A study on dryland rice microclimate and water status was conducted using a line source sprinkler system at the International Rice Research Institute, Los Baños, Laguna, Philippines, during the 1980 and 1981 dry seasons. The combined effects of soil water shortage and microclimate on the growth and development of rice were monitored during the flowering stage. Vapor pressure deficit and canopy temperature at the dry ends of the gradient plots increased with windspeed and solar radiation. Leaf water potential was closely related to solar radiation flux density and decreased with decrease in irrigation water applied. The maximum differences in vapor pressure deficit, canopy temperature, and leaf water potential between stressed (environment 5) and well-watered (environment 1) locations occurred at peak solar radiation. Soil water shortage and the unfavorable microclimate caused leaf area and dry matter production to decrease with lower water application. Grain yield and spikelet fertility decreased by 82 and 68%, respectively, over the water application gradient during the 1980 dry season trial and by 87 and 75% from environment 1 to environment 5 during the 1981 trial.
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