2) Miwa, E. (1990) Global Nitrogen Flow and Degradation of Soils and Environment , transact onions 14 th International Congress of Soil Science, V, 271-276.
5) Kawashima, H., M. J. Bazin and J. M. Lynch, The World Protein Supply and Nitrogen Fertilizer Demand in the 21 sty Century. Global Environmental Change, submitted.