[Report on the marginal soil project in the "Aagaarden" 1988-1993]

abonos amendement calcique azote barbecho crop yield crops cultivos danemark denmark dinamarca engrais enmiendas calizas fallow fallow systems faune et flore sauvages feed grasses fertilizers field experimentation leaching lessivage du sol liming materials nitrogen plante de culture rendement des cultures rendimiento de cultivos sistemas con barbecho soil sol suelo vida silvestre wildlife