共 6 条
- [1] Krusekopf H. H., 1942, SOIL SCI SOC AMER PROC, V7, P434
- [2] MARBUT CF, 1936, ATLAS AM AGRICULTU 3, P34
- [3] Ross CS, 1924, AM J SCI, V7, P483
- [4] SHAW B., 1940, Proceedings. Soil Science Society of America, 1939, V4, P78
- [5] SMITH RM, 1946, SOIL SCI, V62, P307, DOI 10.1097/00010694-194610000-00005
- [6] Winters Eric., 1942, SOIL SCI SOC AMER PROC, V7, P437