共 20 条
[1]
BALL WS, 1985, ND B A, V574
[3]
BAUER A, 1980, ND B, V510
[6]
CHOLICK FA, 1988, 1987 SOIL FET RES S
[9]
GEHL DT, 1988, REV RESULTS 1987, P72
[10]
GEHL DT, 1986, REV RESULTS 1985, P63