共 17 条
- [11] MAGNESS R. M., 1954, Agric. Chem., V9, P63
- [12] NIELSSON F, 1960 P FERT IND ROUN, P23
- [13] PHELPS GW, PRIVATE COMMUNICATIO
- [15] SCHMALZ TR, 1959 P FERT IND ROUN, P70
- [16] TYLER WS, 1955, PROFITABLE USE TESTI, P24
- [17] WENDT NE, 1960 P FERT IND ROUN, P86