共 20 条
- [1] ALBRECHT WA, 1919, MISSOURI AGR EXP STA, V163, P67
- [2] BROWN PE, 1912, IOWA AGR EXP STA RES, V6
- [3] BROWN PE, 1913, IOWA AGR EXP STA RES, V13
- [4] BROWN PE, 1916, J AGR RES, V5, P855
- [5] Can we predict probable fertility from soil biological data? [J]. SOIL SCIENCE, 1918, 6 (06) : 449 - 462
- [6] FRAPS GS, 1920, TEXAS EXP STA B, V259
- [7] JENSEN CA, 1910, DEPT AGR BUR PLANT I, V173
- [8] JENSEN CA, 1916, J AM SOC AGRON, V8, P10
- [9] KING FH, 1901, WIS AGR EXP STA B, V85
- [10] LEMMERMANN O, 1920, CENTBL BAKT, V50, P33