共 8 条
- [1] BOUYOUCOS GEORGE J., 1928, JOUR AMER SOC AGRON, V20, P82
- [2] BRIGGS LJ, 1899, USDA BUR SOILS B, V15
- [4] GARDNER FD, 1898, USDA BUR SOILS B, V12
- [5] GARDNER FD, 1897, USDA BUR SOILS B, V6
- [6] GORZ G, 1924, INT MITT BODENK, V14, P35
- [7] GREAVES JE, 1922, J AM SOC AGRON, V14, P207
- [8] KELLEY WP, 1920, CALIF AGR EXP STA B, V318