Abstract
The objective of this experiment is to compare the responses in grain yield and yield compoents of F2 populations to that of their parents as well as commercial rice varieties under four different growing conditions. Two F2 populations, Taichung 65 x Tainan 3 and Kwanfu 401×Tainung 38; four parents, Taichung 65, Tainan 3, Kwanfu 401, and Tainung 38; and two commercial varieties, Tainung 61 and Taipei 309 were used as experimental materials. Two spacings, 25cm x 20cm and 25cm x 10cm, and two nitrogen levels, 80 and 120 kg/ha of pure nitrogen were combined into four different growing conditions, and all F2 populations and varieties were planted under the four treatments. The field layout was a split-split plot design with four replications. In general, the respones in grain yield and yield components of the two F2 populations under four different growing conditions revealed the same tendency as their parents and the two commerial varieties. In first crop of 1971, close spacing increased the panicles per unit area, but decreased the grain number per panicle, showed little response in grain yield. The high rate of nitrogen application positively responsed in grain number per panicle, but negatively responsed in 1,000 kernel weight, percentage of fertility, and grain yield. The close spacing with high rate of nitrogen application could only decline the 1,000 kernel weight, percentage of fertility and grain yield. In second crop of 1971, all the materials planted under different spacings and nitrogen applications did not show any clear trend in grain yield and yield components except the close spacing did increase panicles per unit area. The responses in grain yield and yield components of F2 populations, however, showed a little bit narrower range of variation than the rice varieties under the four growing conditions. The data of this experiment also indicated that rice plant has the ability of compensation through its yield components under different growing conditions.
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