桂朝二号具有较强的分蘖优势,80％以上的产量靠分蘖构成。但分蘖具有两种表现:早期分蘖成穗率高能形成一定的穗形结构,有利于高产;后期分蘖不仅成穗率低,而且穗形又小,对形成产量作用不大。分蘖过多过少同样会影响产量的高低,分蘖过旺会造成田间郁闭,恶化小气候条件,空壳粒多,病虫害严重;分蘖过少,总穗数少势必减产。为探讨桂朝二号分蘖、成穗与产量的关系,80年我们进行了不同分蘖的单株试验。(一)试验概况:本试验在县良种场第二生产队的油菜田里进行。移栽时所带不同分蘖茎分为0、1、2、3、4、5、6分蘖。田 Gui Chao II has a strong tillering advantage, more than 80% of the yield by tillering. However, tillering has two manifestations: early tillering into high spike rate can form a certain spike structure, which is beneficial to high yield; late tillering not only has low spike rate, but also has a small spike and little effect on yield formation. Tillers too little too will also affect the level of yield, excessive tillering will cause field canopy closure, deteriorating microclimate conditions, the number of empty shell and more pests and diseases serious; less tillers, less the total spike will inevitably cut. In order to discuss the relationship between tillering, ear-forming and yield of Guizhao No.2, we conducted a single-plant experiment with different tillers in the past 80 years. (A) Test Profile: This test was carried out in the rapeseed field of the second production team of the County Seed Farm. Transplanted with different tillers stems are divided into 0,1,2,3,4,5,6 tiller. field