共 18 条
[1]
BATJER LP, 1935, B NY AGRIC EXP STA, P626
[2]
BOULDING KE, 1948, ECONOMIC ANALYSIS
[3]
THE EVALUATION OF SOILS AND THE DEFINITION OF QUALITY CLASSES FROM STUDIES OF THE PHYSICAL PROPERTIES OF THE SOIL PROFILE IN THE FIELD
[J].
JOURNAL OF SOIL SCIENCE,
1951, 2 (01)
:50-60
[4]
COLLIER D, 1958, FLD CROP ABSTR, V12, P277
[5]
COLLIER D, 1955, FLD CROP ABSTR, V8, P246
[6]
COPE F, 1961, THESIS U LEEDS
[7]
DEAKINS RM, 1952, 6 P INT GRASSL C, V2, P968
[8]
ENGLEDOW FL, 1930, J AGRIC SCI, V20, P337
[9]
HEADY EO, 1955, B IOWA AGRIC EXP STA, P424
[10]
HODGSON DR, 1961, THESIS U LEEDS