水稲の散播直播栽培における苗立密度と1次最終分げつの出現節位との関係に及ぼす初期生育の影響

日本作物学会紀事

佐々木 良治¹  杉本 光穂¹  鳥山 和伸¹  柴田 洋一¹ 

[1] 農業技術研究機構

关键词: Direct seeding;    ç›´æ’­;    Last visible primary tiller;    1次最終分げつ;    Leaf appearance;    出葉;    Nodal position;    節位;    Rice;    水稲;    Seedling density;    苗立密度;    Tiller;    分げつ;   

DOI  :  10.1626/jcs.73.309

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Studies on the correlation of seedling density with the nodal position of the last visible primary tiller on the main stem is necessary for modeling of crop growth and development, because the potential number of cumulative total tillers per plant is determined by the nodal position of the last visible primary tiller. The nodal position of the last visible primary tiller on the main stem was negatively correlated with the seedling density irrespective of year in both Dontokoi and Kinuhikari. The nodal position decreased as the seedling density increase at the rate of 0.15 to 0.17 nodes per 10-plant increase per m2. When the tiller emergence from lower nodes was suppressed by deep-water management during establishment and early growth stage, the decrease of the nodal position of the last visible primary tiller with the increase of seedling density was not influenced, but the nodal position increased by 0.6-1.3 nodes compared with that in the normal water management. This phenomenon is attributed to the relative delay of canopy development and competition for resources.

【 授权许可】

Unknown