共 24 条
[2]
Ames JW, 1918, SOIL SCI, V5, P311
[3]
BROWN PE, 1914, IOWA AGR EXP STA REX, V18
[4]
CONN HJ, 1917, NY GENEVA AGR EXP ST, V60
[5]
CONN HJ, 1916, NY GENEVA AGR EXP ST, V52
[6]
EMERSON P, 1923, J AM SOC AGRON, V15, P495
[7]
GARVER S, 1922, USDA B, V1087
[9]
HART EB, 1915, J AGR RES, V5, P233
[10]
KING FH, 1908, SOIL, P178