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棉 花 学 报 Cotton Science 2008，20(4)：312-314
Effects of Potassium on Fiber Maturity of Different Positions in High Quality Cotton Abstract：High quality cotton has shown different boll development and fiber quality.The objective of this study was to investigate the effects of potassium on fiber maturity of different positions in high quality cotton．The study was undertaken on two cultivars of high quality upland cotton, one was a hybrid cultivar(Kemian 3),another was a conventional cultivar(Kemian 4),at Yangzhou University Farm，Yangzhou of Jiangsu Province，China，during 2003 and 2004．The results showed that reasonable potassium fertilizer application increased fiber maturity of the middle and upper parts of the plant effectively ，especially for the fiber maturity in the upper parts, consequently narrowed the difference of fiber maturity between them and improved the fiber maturity of the whole plant.Applying potassium fertilizer at 225 kg·hm-2 was most helpful to enhance fiber maturity. The reasonable potassium fertilizer management with the ratio of basal dressing to fertilizer application during flowering to boll development was 5∶5 for Kemian 3 and 7∶3 for Kemian 4, respectively,and it was more beneficial to increase fiber maturity in the middle and upper parts of the plant, and the difference of fiber maturity between them was minimum.
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