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[5]
Grain yield and kernel weight of two maize genotypes differing in nitrogen use efficiency at various levels of nitrogen and carbohydrate availability during flowering and grain filling[J] . I. A. Paponov,P. Sambo,G. Schulte auf′m. Erley,T. Presterl,H. H. Geiger,C. Engels.Plant and Soil . 2005 (1)