The effects of crop husbandry and nitrogen fertilizer on nitrate leaching from a shallow limestone soil growing a five course combinable crop rotation.

abonos nitrogenados aradura azote barley brassica napus calidad del agua cebada cropping systems cultivation cultivo date de traitement fecha de tratamiento guisante labour leaching lessivage du sol lithological soil types nitrate nitrates nitratos nitrogen nitrogen fertilizers orge peas ploughing pois pollution pratique culturale reino unido rotation culturale rotational cropping sistemas de cultivo soil sol suelo treatment date trigo type de sol lithologique united kingdom water quality wheats