共 17 条
- [1] [Anonymous], 1954, AGR HDB USDA, V60
- [2] BAXTER JF, 1981, AGR ENG YB AM SOC AG, P231
- [3] CROSS OE, 1973, T ASAE, V16, P160
- [4] DAS D K, 1981, Journal of the Indian Society of Soil Science, V29, P543
- [5] ELSON JESSE, 1941, SOIL SCI SOC AMER PROC, V6, P86
- [6] FOGG CE, 1978, IMPROVING SOILS ORGA, P12
- [7] FREEZE BS, 1985, CAN J SOIL SCI
- [8] GILL WR, 1967, AGR HDB USDA, V316, P126
- [10] HOBBS EH, 1977, LRS3 AGR CAN RES STN