TY - BOOK AU - Fresco, Louise O AU - Oenema, O AU - Smaling, E. M. A TI - Nutrient disequilibria in agroecosystems : concepts and case studies SN - 851992684 SN - 99014039 U1 - 577.55 PY - 1999/// CY - Wallingford, UK ; Cambridge, MA PB - CABI Pub KW - Agricultural ecology KW - Plant nutrients N1 - Includes bibliographical references ER -