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以短季棉常规株型为对照 ,研究了多茎株型的密度适应性。结果表明 :在 5.2 5万～ 8.2 5万株 /hm2 范围内 ,随密度的增加产量提高 ,最大值是 6.75万株 /hm2 ,霜前籽棉产量 51 4 0 .5kg/hm2 ,比 8.52万株 /hm2 处理增产 1 7.1 % ,增产效果达较显著水平 ;密度与株型之间的互作效应不显著 ;但多茎株型与常规株型相比 ,三个不同密度处理分别增产 2 0 .4%、2 0 .2 %和 1 8.8% ,增产效果均达较显著水平 ,说明多茎株型是短季棉高产栽培的理想株型 ,密度的适应性强 ,适宜的密度范围为 5.2 5万～6.75万株 /hm2 ,在此密度条件下 ,叶枝均衡发育 ,群体干物质积累量高 ,具备形成高产的物质基础。
With short-season cotton conventional plant type as a control, to study the density adaptability of multiple stem plant type. The results showed that in the range of 52 500-8 5200 plants / hm2, the yield increased with the increase of density, the maximum was 6.75 million / hm2, the yield of pre-frost seed cotton was 51 40.5 kg / hm2, more than 85200 / hm2 treatment increased yield by 7.11%, the effect of increasing yield reached a significant level; the interaction effect between density and plant type was not significant; however, compared with conventional plant type, the multi-stem plant yield increased by 20.4 %, 20.2% and 1 8.8%, respectively. All the results showed that the multi-stalk type was the ideal plant type for high-yielding short-season cotton with strong adaptability to density. The suitable density range was 5.25 million ~ 67500 plants / hm2. Under this density condition, the branch development is balanced and the dry matter accumulation of the population is high, which provides the material basis for the high yield.