共 7 条
[2]
HAMMOND LUTHER C., 1958, SOIL SCI SOC AMER PROC, V22, P548
[3]
JACOB WC, 1956, SOIL SCI SOC AM P, V10, P257
[4]
PETERSEN RG, 1965, METHODS SOIL ANAL 1, V9, P54
[5]
RIBLE JM, TO BE PUBLISHED
[6]
Rigney J. A., 1946, SOIL SCI SOC AMER PROC, V10, P257
[7]
Snedecor G.W., 1980, STAT METHODS