Effectiveness of annual fertilization with pig slurry in a crop rotation containing 100 per cent of grain crops [broad bean, winter wheat, spring barley]

abonos absorption de substances nutritives agricultural chemicals agronomic characters amendement du sol barley cebada cereales cereals composition contenido proteico cropping patterns crops cultivos cultivos de grano dicotiledoneas dicotyledons economic plants engrais engrais organique enmiendas del suelo feed crops feed legumes fertilizers fisiologia fonction physiologique grain crops hortalizas (plantas) hortalizas leguminosas legumes leguminosae leguminosas leguminosas forrajeras liquid manures mode de culture nutrient uptake orge papilionoideae physiological functions physiologie physiology plantas plantas forrajeras plante plante de culture plants productividad productivity produit agrochimique profitability protein content purin rendement rendimiento rentabilidad rosales rotational cropping soil amendments trigo trigo de invierno vegetable crops vegetable legumes vicia vicia faba wheats winter wheat yields