棉 花 学 报 Cotton Science 2006，18(4)：209-212
Effects of Potassium on Boll Development of Different Positions and Influence of Endogenous Hormone Mechanism in High Quality Cotton Abstracts：High quality cotton has shown different boll development and fiber quality，the objective of this study was to investigate the effects of potassium on boll development of different positions and the influence of endogenous hormone mechanism in high quality cotton. The study was undertaken on a hybrid (Kemian 3) at Yangzhou University Farm，Yangzhou of Jiangsu Province，China，during 2003 and 2004.The results showed that potassium fertilizer application increased the boll size and boll weight effectively， especially for the bolls in the upper parts of the plant. While applying potassium fertilizer at 225、 375kg·hm-2，the volume of the bolls in the upper part of the plant were 6.75% and 3.95% lower than that of the middle part，respectively. Compared with the middle part，the upper boll weight of the cotton plant was 4.50% lower with potassium fertilization at 225kg·hm-2. whereas 1.89% higher with potassium fertilization at 3755kg·hm-2.That made the overall boll weight increase and got a higher lint yield. Potassium fertilizer application also increased the fiber length and maturity significantly，narrowed the fiber quality difference between the middle and upper plant. Potassium also increased micronaire value. The results also showed that the absorption of potassium at the reproductive organs increased the IAA content in boll husk and the ZR content in the fiber for the whole plant. There are significant positive correlation between the IAA content in boll husk and boll volume，boll weight，respectively （r=0.9647**，r=0.9145**），significant positive correlation between the ZR content in fiber and the fiber length，fiber maturity，respectively (r=0.8712*，r=0.9474**). These results suggested that potassium nourishment had changed the endogenous hormonal system，which induced boll development and bolstering boll weight and fiber quality for the whole plant.
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