Sorghum for energy in Mediterranean environment. Effect of N fertilization with limited water supply [Campania]

abonos nitrogenados bilancio energetico biomasa biomass biomassa biomasse campania campanie colture da combustibili concimi azotati crop yield disponibilidad del agua eau disponible energy balance energy value environmental factors facteur du milieu factores ambientales fattori ambientali fertilisation fertilizer application fuel crops mediterranean zone metodi statistici nitrogen fertilizers rendement des cultures rendimiento de cultivos sorghum almum sorghum bicolor statistical methods valore energetico water availability zona mediterranea