共 21 条
[2]
DEMOLON A, 1933, MEZOGAZDASAGI KUTATA, V6, P474
[4]
FORD MC, 1933, J AM SOC AGRON, V25, P134
[5]
FRAPS GS, 1910, TEX AGR EXP STA, V212, P267
[6]
FUDGE J. FRANKLIN, 1928, JOUR AMER SOC AGRON, V20, P280
[7]
GAARDER T, 1930, MEDD VESTLANDETS FOR, V24, P5408
[8]
GERICKE S, 1934, PHOSPHORAURS, V4, P79
[9]
GILE PL, 1933, US DEP AGR TECH B, V371