共 11 条
[1]
DUNCAN W. G., 1957, AGRON JOUR, V49, P57
[2]
DUNCAN W. G., 1959, AGRON JOUR, V51, P103
[3]
Esau K., 1960, ANATOMY SEED PLANTS, DOI DOI 10.1097/00010694-196008000-00031
[6]
KIESSELBACH TA, 1949, 161 U NEBR COLL AGR
[8]
MEDERSKI H. J., 1961, SOIL SCI, V92, P143, DOI 10.1097/00010694-196108000-00013
[9]
MILLER M. H., 1959, CANADIAN JOUR SOIL SCI, V39, P205
[10]
PIPER CS, 1947, SOIL PLANT ANALYSIS