共 28 条
[1]
Babcock B. A., 1992, Review of Agricultural Economics, V14, P271, DOI 10.2307/1349506
[5]
Boswell F. C., 1985, Fertilizer technology and use, P229
[10]
Dilz K., 1988, Nitrogen efficiency in agricultural soils. Proceedings Symposium Edinburgh, 16-18 Sept. 1987., P1