共 7 条
[2]
CHANG S. C., 1957, SOIL SCI, V84, P133, DOI 10.1097/00010694-195708000-00005
[3]
DUNBAR ANDREW D., 1965, SOIL SCI SOC AMER PROC, V29, P259
[5]
OLSEN S. R., 1963, SOIL SCI SOC AMER PROC, V27, P648
[6]
RICH CI, 1955, 475 VA AGR EXP STA B
[7]
WOODRUFF J. R., 1965, SOIL SCI SOC AMER PROC, V29, P148