共 36 条
[1]
ALLMARAS R R, 1975, Soil Science Society of America Proceedings, V39, P771
[2]
[Anonymous], 1971, METHODS EXAMINATION
[3]
Artschwager E, 1926, J AGRIC RES, V33, P0143
[5]
BISCOE P, 1982, BRIT SUGAR BEET REV, V50, P41
[6]
BISCOE P, 1980, BRIT SUGAR BEET REV, V48, P47