共 7 条
- [2] Chapman H D, 1961, METHODS ANAL SOIL PL, P150
- [3] GREENHILL W. L., 1960, JOUR BRIT GRASSLAND SOC, V15, P48, DOI 10.1111/j.1365-2494.1960.tb00154.x
- [6] RAYMOND W. F., 1954, Journal of the British Grassland Society, V9, P119, DOI 10.1111/j.1365-2494.1954.tb01326.x
- [7] WILKINSON ROBERT, 1965, MICH AGR EXP STA QUART BULL, V47, P518