Fertlizer use and portein production : Proceedings of the 11th Colloquim on International potash Institute held in Ronne-Bornholm/Denmark, 1975 - Colloquim on International potash Institute 1975 : Ronne-Bornholm, Denmark); International potash Institute (Ronne-Bornholm, Denmark : International Potash Institute, 1975)
Includes bibliographical references and index
Keywords: Agricultural ecology; Field crops