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为了探索杂交稻分蘖调控技术， 对不同栽植密度中不同出生期分蘖的性状进行追踪观察， 明确： （１） 主茎、秧田分蘖和栽后头１０ｄ 分蘖的出生数， 随栽植密度的增加而增加， 成穗率１００ ％ ， 穗大粒重， 构成总穗数的４７ ％ ～８３ ％ 、总产量的６１ ％ ～８９ ％ ； （２） 栽后１１ ～２０ｄ 分蘖出生数也随栽植密度的增加而增加， 成穗率与栽后２０ｄ 的总茎蘖数和最高茎蘖数成负相关（ ｒ＝－ ０９８４１ ＊ ＊ ， － ０９５２５ ＊ ＊ ） ， 构成总穗数的５０ ％ ～１７ ％ 、总产量的３９ ％ ～１１ ％ ； （３） 在栽后２０ｄ， １ｍ２ 总茎蘖数为３００ 、４００ 、５００ 个时， 有效分蘖临界期分别在栽后２０ｄ、１５ｄ 和１０ｄ； （４） 栽后２１ ～３０ｄ 出生的分蘖， 成穗率很低， 穗小粒轻， 只构成总穗数的０ ～３ ％ 、总产量的０ ～１ ％ ；（５） 嫩秧早发， 具有单位面积较大的穗容量和库容量。研究结果表明： 杂交稻培育多蘖嫩壮秧、适量密植、促进早发、抑制移栽后２０ｄ 以后分蘖萌发， 控制总茎蘖数， 是建立高成穗率、兼容穗多、穗大的高产群体的组合技术。
In order to explore the tillering technology of hybrid rice, traits of tillers at different growing densities were traced and observed. The results showed that: (1) The number of tillers of main stems and seedlings at the first ten days after planting increased with the increase of planting density, The percentage of spikelets was 100%, the spikelets were large, accounting for 47% -83% of the total spikes and 61% -89% of the total. (2) The number of tillers at 11 ~ 20d after planting also increased with the increase of planting density, The percentage of spikelets was negatively correlated with the total number of tillers and tillers at 20 days after transplanting (r = - 09841 * *, -09525 *), which accounted for 50% ~ 17% of the total spikes (3) After the tiller number of 1m2 was 300, 400 and 500 at 20 days after transplanting, the effective tillering critical period was 20 days, 15 days and 10 days after transplanting respectively. (4) After transplanting 21 Tillers born at ~ 30d had a low percentage of spikelets and light spikelets, which constituted only 0 of the total spikelets 3%, 0 to 1% of the total; (5) the tender seedlings early onset, having capacity per unit area and larger storage capacity ear. The results showed that the hybrid rice could cultivate more tiller and tender seedlings with the proper amount of close planting to promote the early onset and inhibit the tiller germination and total tiller number 20 days after transplanting, Group combination technology.