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《Journal of Soil and Water Conservation》 2006-02
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Genotypic Variation in Yield,K Uptake and Utilization of Rice at Different K Supply

JIA Yan-bo~1,YANG Xiao-e~1,WANG Wei-mu~2 (1.MOE Key Lab of Environ.Remediation and Ecosystem Health,Zhejiang University,Hangzhou 310029;2.College of Water Conservancy and Hydropower Engineering,Hohai Univ.,Nanjing 210098)  
A field trial was carried out to study the effect of different K supply on the grain yield,K acquisition and utilization of eight rice cultivars.Results showed that there were significantly genotypic variations in rice grain yield,K utilization efficiency and shoot K accumulation at different growth stage under two different K supply.Compared with normal K supply, rice grain yield and shoot K accumulation were decreased,and K utilization efficiency was increased under low K supply.Correlation analysis showed that under low K supply rice grain yield was positively correlated with K utilization efficiency,shoot K accumulation of both growth early stage and growth mid-stage(p0.05),and under normal K supply rice grain yield was positively correlated with K utilization efficiency and shoot K accumulation of growth early stage(p0.05).Therefore,screening and breeding rice genotypes with higher K utilization efficiency and higher ability to accumulate K at growth early stage would probably be one of alternatives to alleviate the K deficiency of paddy soil in south of China.
【Fund】: 国家高技术研究发展计划(863计划)资助项目(2001AA241025-1)
【CateGory Index】: S511
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