共 6 条
[1]
BENSON NELS, 1939, JOUR AMER SOC AGRON, V31, P44
[2]
Black C.A, 1965, METHODS SOIL ANAL 3, V2, P1149, DOI DOI 10.2136/SSSABOOKSER5.3.C37
[3]
CHAPMAN H. D., 1949, HILGARDIA, V19, P57
[5]
KOHNKE H, 1940, US DEP AGRIC MISC PU, V372, P1
[6]
PELCZAR MJ, 1972, MICROBIOLOGY