棉花稀植大棵群体不同果枝产量与品质分布特征的研究

以湘农杂棉68为试验材料,研究其在稀植大棵栽培下棉花不同果枝产量与品质的空间分布特征.结果表明：不同果枝棉铃的产量和纤维品质性状存在差异.第6～17果枝是构成棉花产量的重要组成部分,其成铃数多、单铃重高、衣分波动较大；中下段第7～10果枝和顶端第20、22果枝的纤维品质具有优势,其纤维长度、比强度较好.棉铃产量和品质综合性状空间分布的聚类分析表明,果枝可分成差异明显的四大类,按优劣性状表现为中上部＞中下部＞顶部＞基部.

Studies on Distribution Characteristics of Yield and Fiber Quality of Different Fruiting Branch under Low Density Planting in Cotton

Distribution characteristics of yield and fiber quality of different cotton fruiting branch under low density plant- ing was studied with Xiangnongzamian 68 as material. The results indicated that obvious differences in yield and fiber quality existed among different fruiting branch. The 6th to 17th fruiting branches were the important part in cotton yield, and they had more boll number, higher boll weight and bigger fluctuation of lint percentage. The 7th to 10th fruiting bran- ches and the 20th to 22nd fruiting branches showed dominance in fiber quality, i.e. better fiber length and fiber strength. Clustering analysis on spatial distribution of cotton yield and fiber quality showed that fruiting branches could be ＇divided into four distinct types, and the sequencing was middle and upper part 〉 middle and lower part 〉 top part 〉 basal part.