Nitrogen fertilization and yield of winter pea-corn mixture as a precrop of the silage maize

abonos nitrogenados application rates biomasa biomass biomasse cantidad de semilla requerida contenido de materia seca crude protein cultivo mixto cultivos de invierno culture d'hiver dose d'application dry matter content feed crops mixed cropping nitrogen fertilizers pisum sativum plantas forrajeras proteina bruta rendement rendimiento rotation culturale rotational cropping sowing rates triticum winter crops yields zea mays