共 8 条
[1]
DUDLEY JE, 1926, USDAFB 1462
[2]
FREYTAG GF, 1955, DISSERTATION
[5]
Smith FF, 1931, J AGRIC RES, V43, P0267
[6]
TISSOT AN, 1932, 1932 FLOR AGR EXPT S, P690
[7]
WADE B. L., 1937, Yearbook of the United States Department of Agriculture, P251
[8]
WOLFENBARGER D, 1961, DISSERTATION