Effect of Early-Stage Shading of Direct Seeded Rice on Growth and Yield Components

Japanese Journal of Crop Science

Hisao NAKANO¹ 

关键词: Diameter of culm;    遅播き;    稈径;    遮光;    水稲;    登熟歩合;    一穂籾数;    分げつ;    Late seeding . Percentage of ripened grains;    Rice plant;    Shading;    Spikelet number per head;    Tiller;   

DOI  :  10.1626/jcs.69.182

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The tillering ability and yield of sod-seeded rice are affected by the shading by manure crops during the intial stage. In this study, the effects of shading during the early stage of growth on the growth and yield components in rice Kibinohana were examined. Seedlings were grown in pots under 0, 50, 80, and 95% shading for 16 or 28 days after emergence in 1995, and for 25 or 34 days in 1996. The heavier the shading, the lower the plant age in leaf number during the first 2 to 3 weeks after the end of the treatment. In the shaded plants. the tillers started to emerge about 2 weeks after the shading. The tillers emerged 2 to 3 weeks after heavy shading were inferior in total number and culm diameter to those after light shading. After 95% shading, the number of tillers emerged 2 to 3 weeks after the shading, the survival rate and the spikelet number were lower than those after light shading. The spikelet number and the percentage of ripened grains were low, in the tillers emerged late. Consequently, the heavier the shading in the early growth stage, the later the tiller emergence and the lower the number of spikelets per head and the percentage of ripened grain pet plant. The heading time was also delayed by heavy shading.

【 授权许可】

Unknown