共 52 条
[31]
PATTEN HE, 1908, USDA BUR SOILS B, V52
[32]
PRATOLONGO U, 1910, R I LOMBARDO SCI S2, V43, P542
[33]
RAUTENBERG F, 1862, J LANDW, V7, P49
[34]
ROHLAND P, 1910, CHEM ZENTBL, V2, P491
[35]
ROHLAND P, 1910, LANDW JB, V39, P369
[36]
RUPRECHT RW, 1915, MASS AGR EXP STA B, V165
[37]
SABANIN AN, 1908, EXP STA REC, V22, P520
[38]
SABANIN AN, 1908, POCHVOVYEDYENIE PEDO, P87
[39]
STOKLASA J, 1912, CHEM ZTG, V35, P1425
[40]
TADSKARO T, 1914, J COL AGR TOHOKU IMP, V6, P27