共 29 条
- [1] Calcium and magnesium content of virgin and cultivated soils [J]. SOIL SCIENCE, 1919, 8 (04) : 323 - 335
- [2] AMES JW, 1913, OHIO AGR EXP STA B, V261
- [3] AMES JW, 1921, OHIO AGR EXP STA B, V351, P251
- [5] Conner S. D., 1921, J AM SOC AGRON, V13, P113
- [6] ENGELS O, 1912, LANDW VERS STAT, V77, P269
- [8] Hoagland DR, 1918, J AGRIC RES, V12, P0369
- [9] HOAGLAND DR, 1920, J AGR RES, V18, P73
- [10] HOLLEMAN AF, 1892, LANDW VERS STAT, V41, P37