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《Shandong Agricultural Sciences》 2009-12
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Effects of Density and Plant Pruning on Yield Distribution of Hybrid Bt Cotton

LUO Zhen,LI Wei-jiang,DONG He-zhong,TANG Wei,ZHANG Dong-mei,LU He-quan,LI Zhen-huai(Cotton Research Center,Shandong Academy of Agricultural Sciences/Shandong Key Lab for Cotton Culture and Physiology,Jinan 250100,China)  
The multi-site field experiment was conducted in Linqing,Jiaxiang and Jinxiang county of Shandong Province respectively to study the effects of density and plant pruning on distribution of yield,ratio of sink to source and maturity performance in 2008.A split-plot design with three replications was used for the study.The main plot was plant pruning(removal and retention of VB,while plant density(3.0,4.5,6.0 and 7.5 plants/m2) constituted the subplots.Regardless of plant density or plant pruning,the yield was mainly distributed in the lower and middle fruiting branches(FB,77%~85%) and the inner fruiting nodes(76%~88%),while less distribution was seen in upper FB(15%~23%) and outer fruiting nodes(12%~24%).Both plant density and plant pruning exhibited significant effects on yield distribution,while their interaction effect was not significant.Yield distribution from inner to outer fruiting nodes was mainly affected by plant density,and more yield distribution to inner fruiting nodes was found as plant density increased.Varied yield distribution from upper to lower FB was mainly attributed to plant pruning,while VB-retention resulted in more dispersal in longitudinal distribution.Soil fertility and cultivation patterns affected the contribution rate of VB to yield.The average contribution rate of VB was 19.4% and 18.0% in Jiaxiang and Jinxiang respectively,but it was only 11.2% in Linqing.The contribution rate of VB to yield decreased as plant density increased.The average contribution rate of VB of all sites were 24.9% and 8.9% as plant density were 3.0 and 7.5 plants per square meter,respectively.Plant density affected the maturity performance,while VB-retention did not affect it.Moderate increase in plant density could delay the cotton senescence.
【Fund】: 公益性行业(农业)科研专项(nyhyzx07-005-02);; 山东省重大应用技术研究项目(2009-棉花);; 现代农业产业技术体系建设专项资金资助
【CateGory Index】: S562.01
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