共 11 条
[1]
[Anonymous], 1960, OFFICIAL METHODS ANA
[4]
FLORENCE W. G. S., 1965, S AFRICAN J AGR SCI, V8, P661
[6]
FOX M, 1971, 2 VICT DEP AGR DIV A
[7]
GLADSTONES J. S., 1970, Field Crop Abstracts, V23, P123
[9]
1968, 1559 PUBL NAT RES CO
[10]
1967, NUTRIENT REQUIREMENT