共 129 条
[61]
Laflen J. M., 1985, Soil erosion and conservation, P285
[63]
Larson W. E., 1982, PREDICTING TILLAGE E, P151
[64]
LARSON WE, 1983, PRESENT FUTURE TECHN, P89
[65]
EFFECT OF CULTIVATION ON STRUCTURE AND OTHER PHYSICAL CHARACTERISTICS OF GRASSLAND AND ARABLE SOILS
[J].
JOURNAL OF SOIL SCIENCE,
1972, 23 (04)
:363-&
[67]
LUTH HJ, 1971, T ASAE, V14, P255
[68]
A RELATION BETWEEN PERMEABILITY AND SIZE DISTRIBUTION OF PORES
[J].
JOURNAL OF SOIL SCIENCE,
1958, 9 (01)
:1-8
[69]
MCKIBBEN EG, 1971, AM SOC AGR ENG MONOG, V1, P3