共 186 条
[2]
AGBOOLA AA, 1971, J AGR SCI, P219
[4]
AHMED S, 1979, AUG P FIN INPUTS REV, P251
[6]
ALLISON FE, 1973, DEV SOIL SCI, V3, P639
[9]
Andrews DJ, 1976, ASA SPEC PUBL, P1, DOI DOI 10.2134/ASASPECPUB27.C1
[10]
[Anonymous], FARMING SYSTEMS TROP