The Apelsvoll [Norway] cropping system experiment IV. Yield and quality of potatoes, forage crops and entire cropping systems

agriculture biologique alimentos cadmio cadmium calidad contenido de materia seca cropping systems dry matter content feed crops foods leys noruega norway organic agriculture pesticide pesticides plaguicidas plantas forrajeras pradera temporal prairie temporaire produit alimentaire quality rendement rendimiento residues residuos sistemas de cultivo solanum tuberosum yields