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棉 花 学 报 Cotton Science 2008，20(4)：295-299
Effects of Nitrogen Fertilization on Dry Matter Accumulation and Its Distribution, Yield and Fiber Quality of Upland Cotton Abstract：The two-year field trial about nitrogen fertilization was conducted on Kemian 3, a excellent high fiber quality cotton cultivar, to analyze the effect of nitrogen nutrition on cotton dry matter accumulation and its distribution, yield and fiber quality in Nanjing city, in 2005 and 2006. The results showed that the dry matter weight of reproductive organs of peak bolling has significant correlation with lint yield. N accumulation of vegetative organ from peak budding to peak flowering and that of all organs from peak flowering to peak bolling had significant correlation with dry matter weight of reproductive organs of peak bolling. Yield formatted from 21th July to 15th August was increased with increasing N accumulation of all organs of peak flowering and that of leaves of peak bolling, while yield formatted from 16th August to 25th August was increased with increasing N accumulation of stem and branches of peak bolling, and yield formatted after 21th July was increased with increasing N accumulation of reproductive organs of peak bolling. The effect of nitrogen fertilization on cotton fiber quality was to influence the ratio of rot boll and the N metabolism of cotton fiber development. When the N fertilization was over the optimum value, the ratio of rot boll was increased significantly with increasing N fertilization, leading to decrease of fiber length, strength and micro value. While N fertilization was under optimum, the fiber strength and micro value was decreased with increasing N fertilization, and no significant effect on fiber length.
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