共 9 条
[1]
BRIGGS LJ, 1912, USDA B PLANT IND B, V230
[6]
SMITH RM, 1948, SOIL SCI SOC AM P, V12, P17
[8]
VEIHMEYER FJ, 1938, AGR ENG NOV, P487
[9]
WOODRUFF CM, 1941, SOIL SCI SOC AM P, V5, P36