1株当たり植付苗数が水稲の分げつ生産に及ぼす影響

日本作物学会紀事

北野 正顕¹  稲葉 健五¹ 

[1] 茨城大学教育学部

关键词: Nodal tiller;    節位別分げつ;    Rice plant;    水稲;    Seedling number per hill;    1株植付苗数;    Spikelet number per panicle;    1穂籾数;    Tiller order;    次位別分げつ;    Tiller production;    分げつ生産;   

DOI  :  10.1626/jcs.74.141

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Tiller production of rice plants (cv. Kinuhikari) transplanted at different seedling numbers per hill (1, 3, 5, 7 and 9 seedlings per hill) was examined in 1994, a hot and sunny year. Tillering duration decreased with increasing number of seedlings per hill (density), and that in the 9-seedling hills was two weeks shorter than that in the 1-seedling hills. The higher the seedling density, the earlier was the time of tillering. In 1 to 5-seedling hills, the tiller production rate increased with increasing seedling density, but the rate decreased in the hills with higher seedling densities. Primary tillers emerged at the third (T3) to the ninth node (T9) of the main stem in 1-seedling hills, at T3 to T9 nodes in 3-seedling hills, and at T3 to T7 nodes in 5, 7and 9-seedling hills. Heading duration was 8—9 days in 5, 7and 9-seedling hills and 10—12 days in 1 and 3-seedling hills. The number of spikelets per panicle decreased with increasing seedling density, and the largest panicles on primary tillers were formed on the tillers at T7, T6, T5 and T4 nodes in 1, 3, 5, 7 and 9-seedling hills, respectively. These results suggest that, in hot and sunny years, seedling number per hill affects the tillering time, tiller number, heading time and panicle size on each nodal tiller.

【 授权许可】

Unknown