[Production of cereals and grain legumes]

abonos nitrogenados agricultural policies barbecho cantidad de semilla requerida cereal crops comunidades europeas conduite de la culture contingent de production crop management cultivos de cereales european communities fallow grain legumes guisante importaciones importation imports leguminosas de grano manejo del cultivo nitrogen fertilizers peas plant protein pois politique agricole production costs production quota profitability proteine vegetale rentabilidad sowing rates