共 18 条
[1]
DAVIES W., 1941, Journal of the Ministry of Agriculture, V48, P112
[2]
DEVRIES DM, 1949, LANDBOUWKD TIJDSCHR, V61, P347
[3]
FENTON EW, 1933, AGR PROGR S, V10
[4]
FRANKENA HJ, 1937, 4TH INT GRASSL C AB, P339
[5]
GIOBEL G, 1942, HERB ABST, V13, P59
[6]
GREGOR JW, 1947, J MINIST AGR, V54
[7]
HAMILTON RA, 1950, P FERTILIZER SOC, V8
[10]
HOLMES W, 1951, IN PRESS J AGR SCI, V40