共 15 条
[1]
[Anonymous], 1947, AGR ENG
[2]
BUELL MJ, 1960, MN B TORREY BOT CLUB, V87, P46
[3]
ELDER JA, 1969, 2 U NEBR CONS SURV D
[4]
EARLY EFFECTS OF FOREST VEGETATION AND TOPOGRAPHIC POSITION ON DARK-COLORED, PRAIRIE-DERIVED SOILS
[J].
SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS,
1970, 34 (01)
:105-+
[5]
JACKSON ML, 1956, SOIL CHEM ANALYSIS A
[7]
LEWIS MW, 1904, ORIGINAL J LEWIS CLA, V2, P130
[8]
LOTSPEICH FB, 1953, SOILS SCI, V76, P476
[9]
PEECH M, 1947, USDA757 CIRC
[10]
POOL RJ, 1917, STUDIES U NEBRASKA, V18