Agriculture, fertilizers, and the environment / M. Lægreid, O.C. Bøckman, and O. Kaarstad. Lægreid, M. (Marit) Bøckman, Oluf Chr. Kaarstad, O. (Ola) Fertilizers. Fertilizers Environmental aspects. S633 .L25 1999 631.8 21 LAA Includes bibliographical references (p. 267-286) and index. New York : Cabi, 1999. 1999. 1999 Text xxiv, 294 p. : http://www.loc.gov/catdir/enhancements/fy0604/99023430-d.html http://www.loc.gov/catdir/enhancements/fy0604/99023430-t.html eng