00496    a2200145   4500020001500000082001500015100003000030245008800060260003600148300001900184440003600203650004000239650004100279700003000320  a0444828524  a630.7bPER  aIttersum, M. K. Van eed.  aPerspectives for agronomybadopting ecological principles and managing resource use  aAmsterdambElsevierc1997g1997  axi,366p.c27cm  aDevelopments in crop science 25  aEducation, research, related topics  aAgriculture and related technologies  aGeijn, S. C. Van De eed.