共 8 条
[1]
Jones FR, 1921, J AGRIC RES, V22, P0017
[2]
Norman A. G., 1946, SOIL SCI SOC AMER PROC, V10, P191
[3]
NORMAN AG, 1944, SOIL SCI SOC AM P, V8, P226
[4]
PINCK LA, 1946, J AM SOC AGRON, V38, P421
[5]
SEARS O. H., 1951, Soybean Digest, V11, P15
[6]
Thornton George D., 1947, SOIL SCI SOC AMER PROC, V11, P249
[7]
WILSON JK, 1917, NY CORNELL AGR EXP B, V386
[8]
1945, METHODS ANAL