Genotypic differences of phosphorus(P) efficiency among 194 Brassica napus L. cultivars were investigated under pot culture in acid soil with a method of two step screening typical cultivars. P efficiency coefficient(the ratio of dry weights or seed
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段海燕 王运华 等. Research on Phosphorus Efficiency of Different Brassica napus L. cultivars[J]. Jorunal of Huazhong Agricultural University,2001,20(3).