共 19 条
[2]
BURGESS PS, 1922, RI AGR EXP STA BUL, V189
[3]
Clark W. M., 1922, DETERMINATION HYDROG
[4]
CONNOR SD, 1917, J ASS OFF AGR CHEM, V3, P139
[6]
GILLESPIE LJ, 1916, J WASH ACAD SCI, V6, P7
[8]
HILL HH, 1919, VA AGR EXP STA TECH, V19
[9]
Hoagland DR, 1918, J AGRIC RES, V12, P0139
[10]
JOFFE LH, 1920, SOIL SCI, V9, P261