共 21 条
- [1] Allison L. E., 1942, JOUR AMER SOC AGRON, V34, P616
- [2] *ASS OFF AGR CHEM, 1935, OFF TENT METH AN
- [3] BENEDICT SR, 1936, J BIOL CHEM, V61, P63
- [5] BRADFIELD R, 1933, T INT SOC SOIL SCI, VA, P63
- [7] FORD MC, 1933, J AM SOC AGRON, V25, P134
- [8] GAARDNER T, 1930, VESTL FORSTL FORSKSS, V14