共 10 条
[2]
AZEVEDO J, 1974, 44 U CAL DIV AGR SCI
[4]
OLSEN SR, 1954, USDA939 CIRC
[5]
OLSEN SR, 1977, SOILS MANAGEMENT ORG, P197
[6]
Pratt P. F., 1980, AGROCHEMICALS SOILS, P33
[8]
PRATT PF, 1976, HILGARDIA, V44, P99, DOI 10.3733/hilg.v44n05p099