共 10 条
[1]
BARRETT JP, 1966, 108 U NEW HAMPSH AGR
[3]
FROTHINGHAM EH, 1914, 13 US DEP AGR B
[4]
HUSCH B, 1956, 95 U NEW HAMPSH AGR
[5]
LEAK WB, 1970, NE176 USDA FOR SERV
[6]
MADER DONALD L., 1961, SOIL SCI SOC AMER PROC, V25, P62
[7]
POST BW, 1970, 664 U VERM AGR EXP S
[8]
STRATTON KG, 1968, 32 U MAIN MAIN AGR E
[9]
WILDE SA, 1964, SOIL PLANT ANALYSIS
[10]
YOUNG HAROLD E., 1954, SOIL SCI SOC AMER PROC, V18, P85