共 23 条
[3]
Bremner J.M., 1965, METHODS SOIL ANAL PA, P1149
[4]
BROOKS PD, 1987, AGRONOMY ABSTRACTS
[8]
FOX R H, 1988, Journal of Production Agriculture, V1, P313
[9]
HAUCK R. D., 1971, Nitrogen-15 in soil-plant studies. Vienna, Austria, IAEA., P65
[10]
Hesterman O. B., 1988, ASA Special Publication, American Society of Agronomy, P155