共 41 条
[1]
ASHLEY DA, 1973, 70 AM P ASS SO AGR W
[4]
BRADY N. C., 1947, SOIL SCI SOC AMER PROC, V12, P336
[5]
BRADY NC, 1945, J AM SOC AGRON, V37, P429
[6]
BRADY NC, 1948, AGRON J, V40, P155
[7]
BURKHART LELAND, 1941, JOUR AMER SOC AGRON, V33, P743
[8]
BURKHART LELAND, 1941, SOIL SCI SOC AMER PROC, V6, P272
[9]
CHESNIN L, 1972, FERTILIZER HDB, P65
[10]
COLWELL WE, 1945, J AM SOC AGRON, V37, P696