3Oski M,Morikawa K,Shinano T,et al.Profuctivity of high-yielding crops.Ⅱ.Comparson of N,P,K,Ca and Mg accumulation and distibution among high-yieding crops[J]. Soil Sci ＆Plant Nutr ,1991,37(3):445-454.
4Shinano T,Osaki M,Tadano T.Effect of nitrogen application on reconstruction of mitrogen compounds during the maturation stage in several fiel crops[J].Soil Sci ＆Plant Nutr,1991,37(2):259-370.
