6Jones GD,Lutz JA.Yield of wheat and soybeans and oil and protein content of soybean as affected by fertility treatments and deep placement of limestone.Agronomy Journal,1971,63:931～934
7Ham GE,Nelson WW,Evans SD,et al.Influence of fertilizer placement on yield response of soybeans.Agronomy Journal,1973,65:81～84
8Poole WD,Randal GW,Ham GE.Foliar fertilization of soybean:Ⅰ.Effect of fertilizer sources,rates and frequency of application.Agronomy Journal,1983,75:195～200
9Wesley TL,Lamond RM,Martin VL,et al.Effects of late-season nitrogen fertilizer on irrigated soybean yield and composition.Journal of Produce Agriculture,1998,5:148～152
10Haq MU,Mallarino A.Response of soybean grain oil and protein concentrations to foliar and soil fertilization.Agronomy Journal,2005,97:910～918
