共 5 条
[1]
ASHTON T, 1948, 14 COMM BUR PLANT BR
[3]
HABER ES, 1938, 243 IOW AGR EXP STA
[4]
HEYNE E. G., 1940, JOUR AMER SOC AGRON, V32, P116
[5]
WRIGHT N, 1960, 142 AR AGR EXP STAT