湘农杂62不同坐果点纤维品质时空分布的研究

Studies on the Spatio-Temporal Distribution on the Fiber Qualit y of Different Fruiting Position in "Xiangnongza62

探讨了不同坐果点对棉花纤维品质的贡献率。结果表明 ,第二坐果点棉铃对纤维品质的贡献率最大 ,达到 3 8 3 1% ,其次是第一坐果点 ( 3 1 81% ) ,再次是第三坐果点 ( 2 9 88% )。确定了棉株 65个坐果点的品质特点 ,并以综合指标为尺度进行了聚类分析。分析表明 ,这些坐果点可分成差异明显的 6大类 ,其中Ⅱ—Ⅴ类为优质类 ,Ⅰ类、Ⅵ类为较差类。就时间分布而言 ,7月 2 0日以前 (伏前桃 )的纤维品质最差 ,贡献率仅 16 3 8% ;7月 2 0日～ 8月 2 0日 (伏桃 )的纤维品质最好 ,贡献率达 3 5 3 6%。

The research shows that the contribution of bolls on second fruiting position to fiber quality is the biggest, contribution rat e reached 38.31%; as for first fruiting position, 31.81%; and fhird fruiting no de, 29.88%. By clustering analysis, the 65 fruiting positions can be divided int o 6 types. The fruiting position of Ⅱ-Ⅴ type posesses higher fiber quality, bu t Ⅰ type?and Ⅵ type are the worst; the research show s that the fiber quality of pre-summer bolls is the worst with a contribution ra te of 16.38% to fiber quality, that of summer bolls is the best, with 35.36% .