共 21 条
- [4] ANDREWS E. D., 1964, NEW ZEALAND J AGRIC RES, V7, P17
- [5] BUTLER G. W., 1961, NEW ZEALAND JOUR AGRIC RES, V4, P484
- [6] BYERS HG, 1938, 601 US DEP AGR TECH
- [7] GANJE TJ, 1958, S DAK ACAD SCI P, V37, P85
- [8] KILMER VICTOR J., 1960, SOIL SCI SOC AMER PROC, V24, P420
- [9] LAKIN HW, 1961, 200 US DEPT AGR AGR, P27
- [10] LAKIN HW, 1961, 200 US DEP AGR AGR H, P3