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(一)群体分蘖由不同的蘖位分蘖组成,每位蘖均有其消长过程,分蘖期每一段都有其特定的蘖位处于始期,盛期或停止期,一般有2—3位蘖在同时活动。旱直播早期分蘖由Ⅱ—Ⅲ位蘖,盛期由ⅣⅤⅥ、高峰前后由ⅦⅧ组成,ⅣⅤⅥ三位蘖的变化与群体分蘖消长曲线一致。旱直播ⅣⅤ、插秧稻为ⅤⅥ,麦茬稻ⅥⅦ位分蘖不仅数量多,有效率高,而且产量性状也好,是群体产量中的主要组成部分。(二)无论何种方式在群体有效分蘖期间出生的分蘖均有部分无效蘖,旱直播早期出生的分蘖有效率比盛期出生的分蘖低,插秧稻则高,后期出生的分蘖也有少量有效蘖。无效分蘖死亡有两个高峰期即颖花分化到雌雄蕊形成期和减数分裂期。(三)分蘖位随施肥期推迟而上移。盆栽麦茬稻不同营养体上穗肥效应表明,大营养体各期穗肥,中小营养体穗首肥分蘖主要由前期Ⅴ、Ⅵ、Ⅶ组成,中小营养体颖花肥与减数分裂肥均有后期出生的地上部高位蘖,其量占25—50%。这些分蘖穗小成熟差,因而中小营养体此二期肥料比穗首肥产量低。(四)高肥水平下插秧方式以8寸×6寸或10寸×3寸每穴4—5苗分蘖结构较好,产量性状也好。
(1) Group tillers consist of tillers with different tillers, and each tiller has its own process of growth and decline. Each tillering stage has its own specific tiller at the beginning, peak or stop, usually 2-3 tillers At the same time activities. Early tillering by direct sowing of tillers from Ⅱ-Ⅲ position, the peak by Ⅳ Ⅴ Ⅵ, before and after the peak by Ⅶ Ⅷ composition, Ⅳ Ⅴ III three tillers consistent with the growth of the population tiller curve. Dry planting Ⅳ Ⅴ, planting rice as Ⅴ Ⅵ, wheat stubble Ⅵ Ⅶ position tillering is not only the number of more efficient, and yield traits Ye Hao, is the main component of the yield. (2) The effective tillering rate of early-born dry-sowed early ducks was lower than that of full-season tillers, transplanting rice was high, and there were a few effective tillers for late tillers . Invalid tillering deaths have two peaks, ie, spikelet differentiation to the formation of stamens and meiosis. (C) tillering position with the delay of fertilization and up. The results showed that the main panicle tillers of panicle and medium and small vegetative panicle mainly consisted of Ⅴ, Ⅵ and Ⅶ, while the small and medium vegetative spikelets and meiosis had late stage The upper part of the birth of the tiller, the amount of 25-50%. These tillers spikelets are poorly mature, so medium and small nutrients of the two fertilizer lower than the first fertilizer yield. (D) high fat level transplanting to 8 inch × 6 inch or 10 inch × 3 inch per hole 4-5 seedling tiller structure is better, the yield traits Ye Hao.