Effect of planting density on the population development and yield of Ⅱ youming 86 as mid - season rice plus ratooning rice | 种植密度对Ⅱ优明86中稻蓄留再生稻群体发育和产量的影响

Chinese. 选用超级杂交稻组合Ⅱ优明86，研究双季稻区中稻蓄留再生稻不同种植密度对其群体发育的产量的影响。结果表明，种植密度为24．43万蔸／hm. 时，产量最高，较好地发挥了主季群体优势，有利协调个体与群体、主季与再生季的矛盾。主季成穗率与种植密度和茎蘖高峰显著负相关，最高茎蘖数、有效穗数随密度的提高而提高，成穗率随移栽密度的递减而提高；齐穗以前LAI与种植密度正相关，齐穗后不相关；低密度种植有利于再生芽的发育；腋芽的发育与茎伤流强度显著相关；单蔸成苗数与主季留桩干重极显著相关。主季植株氮素含量、群体氮素总积累量、各器官氮素分配量、百千克稻谷耗氮量随种植密度随种植密度的下降而提高。[著者文摘]

English. The effect of transplanting density on the population development and yield was studied on Ⅱ Youming 86 as Mid - season and ratooning rice in region of double season rice. The result showed that the highest yield was obtained under the density of 244300 holl/ha. As a dominant population in the main season, it was advantageous to coordinating the conflicts between individuals and population, and between the main season and the ratooning. The effective rate of tiller was negatively correlated with the planting density and the maximum filler number. The maximum number and effective number of tillers increased with the planting density. The LAI and the planting density were positively correlated before full heading and not related after full heading. The lower density was propitious to bud growth. The bud growth and xylem sap amount were positively correlated. The number of ratooning was positively correlated with the dry weight of stalk of rain season subsistence. The nitrogen content of individual plant, total nitrogen amount in the population, nitrogen amount in each organ, and nitrogen consumption of one hundred kilogram grain increased with the density reduction in the main season.