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《Soils》 2014-05
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Effects of Potassium Deficiency on Yield Characters in Terminal Raceme of Oilseed Rape and Potassium Fertilizer Application Effect

LIU Xiu-xiu;LU Jian-wei;WANG Yin;ZHANG Yang-yang;WANG Yang;REN Tao;LI Xiao-kun;CONG Ri-huan;College of Resources and Environment,Huazhong Agricultural University,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River),Ministry of Agriculture;  
A field experiment with two potassium fertilizer treatments(–K and +K) was conducted to study the effects of potassium fertilizer application on oilseed rape yield under condition of potassium deficiency with focus on the different effects of potassium fertilizer application on different location of terminal raceme.The results showed that oilseed rape yield increased significantly when potassium fertilizer was applied to potassium deficiency soil,the increment was 1 321 kg/hm2 with the increase rate was 111%,pods per plant and seeds per pod increased significantly by 50.1% and 9.2% in the meantime,respectively.The potassium fertilizer improved seed weight of terminal raceme,pods per terminal raceme and seeds per pod increased by 33.6%,21.6% and 10.3%,respectively.The enhancement of seed weight,pods and seeds per pod were different in different locations of terminal raceme,the effects of potassium fertilizer on the upper of terminal raceme was much better than the middle and lower position.Compared to the no potassium treatment,the seed weight,pods and seeds per pod in the upper of terminal raceme increased by 69.6%,41.7% and 20.1%,respectively,and the potassium content increased by 124.4% correspondingly.All the results proved that potassium fertilizer application improved oilseed rape yield by enhancing pods and seeds per pod,and the effects of potassium fertilizer performed best in the upper of the infructescence if viewed from the yield characters of the infructescence.
【Fund】: 公益性行业(农业)科研专项(201203013);; 国家油菜产业技术体系建设专项(CARS-13);; 中央高校基本科研业务费专项(2013PY113);; 长江学者和创新团队发展计划项目(IRT1247);; 国际植物营养研究所合作项目(Hubei–35)资助
【CateGory Index】: S565.4
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