棉 花 学 报 Cotton Science 2006，18(5)：294-298
Effects of Exogenous Hormones on Boll Setting and Fiber Quality of High Quality Cotton Abstract：Effects of exogenous hormones(DPC) on boll forming and fiber quality of high quality cotton were investigated in different chemical control levels in this paper. Three different chemical control levels were implemented：high chemical control (HC，210kg·hm-2)，medium chemical control (MC，105kg·hm-2) and no chemical control(CK，0kg·hm-2).The main results were as follows：1)Three treatments had big difference in boll-setting rate at different flowering stages. The boll-setting rate of HC was reduced by3.8%，7.8%，respectively，than that of MC，CK after 8/11(Month/Day) and before 7/20 the boll-setting rate of CK was 5.1%，6.6% lower，respectively，than that of HC and MC.2) the average seed cotton weight of single boll of MC was 8.28%，8.06% higher than that of HC and CK，respectively，in the whole growth stage. The ratio of boll shell weight/boll weight of HC was 6.67%，9.22% higher than that of MC and CK respectively. 3)Compared with MC and CK，the seed number per boll of HC in whole growth stage was decreased 5.32，3.84， the infertile seed ratio of per boll was increased by 11.14%，9.33%，respectively.4) The lint percentage of HC，MC，CK was 37.20%，38.75%，40.25%，respectively，which showed a downward trend with the increasing chemical control level. The seed index of HC，MC，CK was 13.34g，12.48g，11.49g，respectively，which showed a upward trend with the increasing chemical control level.5)The results of fiber quality indicated that fiber length and uniformity were not influenced by different chemical control levels，though there was a upward trend but not significant difference in fiber strength，and downward trend in micronaire value with increasing chemical control level.
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