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ARNEMAN HF, 1968, 83 MINN AGR EXP STA
[2]
BROADBENT F. E., 1958, SOIL SCI SOC AMER PROC, V22, P303
[3]
CONRAD JP, 1940, AGRON J, V32, P48
[4]
ERNST J. W., 1960, SOIL SCI SOC AMER PROC, V24, P87
[5]
Jackson ML, 1958, SOIL CHEMICAL ANALYS
[8]
MEYER R. D., 1961, AGRON JOUR, V53, P241
[9]
OLSON RA, 1967, SB479 U NEBR AGR EXP
[10]
SCHWARTZBECK R. A., 1961, SOIL SCI SOC AMER PROC, V25, P186