Two sample varieties of Yushin and Jinheung were used for the experiment in low-level wetty paddy field which was arranged with PVC pipe underdrainage of 6 m in distance and 60㎝, 90㎝, and 120㎝ in depth and control, using sprit plot design with three replications.
On the yield of brown rice, Yushin was increased by 24.8% in the 90㎝ plot and Jinheung by 16.7% in the 120㎝ plot, respectively, over the control. The ratio of matured grains of these two varieties was increased significantly by the underdrainage and the number of grains per head of Yushin was also increased in drained plots. Otherwise, the underdrainage enhanced the plant height in the early growth of rice plant and further increased the culm height and panicle legnth. It seemed that these results might enhance the light-receiving efficiency in the latter growth of rice plant and bring about the effect of increased yields by the underdrainage.
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