Improved soil quality and barley yields with fababeans, manure, forages and crop rotation on a Gray Luvisol

abonos nitrogenados abonos verdes biological activity in soil biologie du sol crop yield disponibilidad de nutrientes engrais organique engrais vert farmyard manure fertilidad del suelo fumier green manures hordeum vulgare luvisol luvisoles luvisols nitrogen fertilizers nutrient availability organic fertilizers rendement des cultures rendimiento de cultivos rotation culturale rotational cropping soil biology soil fertility sostenibilidad sustainability