共 14 条
[2]
ANDHARIA RM, 1952, THESIS IOWA STATE CO
[3]
DUMENIL L, 1952, IOWA AGR EXPT STA P, V114
[4]
HANWAY JJ, 1948, THESIS U NEB LIB LIN
[5]
KING FH, 1901, WISCONSIN AGR EXPT S, V85
[6]
KRANTZ BA, 1945, BETTER CROPS PLANT F, V29, P19
[7]
LANDRAU P, 1946, THESIS U NEB LIB LIN
[8]
NELSON LB, 1946, IOWA AGR EXPT STA 1
[9]
PANGANIBAN EH, 1925, J AM SOC AGRON, V17, P1