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Cotton Science 2005，17(2)：103-106
Annual Variance of Cotton Fiber Quality and Influence by Climatic-Ecologic Factors Abstract: Based on main characters of CCRI 12 from 1994 to 2003, annual variance and main factors of cotton fiber quality were analyzed. The result showed that the variance of fiber strength was the largest, for its range was 6.5 cN·tex-1，and its mean squares was 80.7% of total mean squares of 2.5% span length, fiber strength and micronaire, and its coefficient of variation is 1.159, much more than that of 2.5% span length(0.219) and micronare(0.319). After variables being changed, the mean squares of the first common factors and the second common factors are 49.5% and 30% of total mean squares, respectively, and their summation is 79.5%. The first common factor was supposed as fiber-length-and-strength factor, for its partial correlation coefficient with fiber length and fiber strength are 0.808 and 0.715, respectively. The second common factor was supposed as micronare factor, for the partial correlation coefficient with micronare is 0.789. The result of path analysis of fiber quality with climatic-ecologic factors showed that the largest direct action of climatic-ecologic factors to 2.5% span length, fiber strength and micronare were mean temperature, mean temperature and rain fall in boll period(from July to October), respectively, their path coefficient are 0.6560, 0.8098 and -0.3156, respectively. Mean temperature in boll period was the major climatic-ecologic factor which affected fiber-length-and-fiberstrength factor, and rainfall in boll period was the major climatic-ecologic factor which affected micronare factor.
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