Studies on Competition and Compensation of Crop Plants : IV. Effects of the methods of cultivation on the contribution of tiller of rice plants in relation to the position

[摘要] Rice plants var. Nihonbare were grown at three culture methods. Mature seedlings and young seedling and of rice plants were transplanted at a single plant per hill or the seeds were directly seeded on upland field. The number of tillers on each position of tillers and leaf area of them at several growing times were determined. The results were obtained as follows. 1. The tillers were observed to appear at nodes above the 7th node, the 3rd node, and the 4th node, in mature seedling plot (M-plot), young seedling plot (Y-plot), and direct seeding plot (D-plot), correspondingly. 2. The number of tillers in two lowest tillering nodes were markedly larger than that in higher position of nodes. The contribution of the former to total number of tillers was 64.7% (M-plot), 54.1% (Y-plot), and 60.6% (D-plot) at maximum tiller number stage, and 66.8% (M-plot), 60.4% (Y-plot), and 64.5% (D-plot) at harvesting time. 3. The sum of leaf area of the tillers in the two lowest nodes at the time of maximum leaf area was markedly large as in the case of tillers, and its contribution to total leaf area per hill was 63.8% (M-plot), 55.9% (Y-plot), and 59.4% (D-plot)

[学科分类] 农业科学（综合）