Comparative studies on productivity in spring cereals, 2: Differences of canopy structure and its relationships with some morphological characteristics [wheats; barley; oats]

agronomic characters anatomia anatomie anatomy avenas avoine barley canopy cebada cereales cereals couvert crops cubierta vegetal cultivos cultivos de grano economic plants grain crops oats orge plant anatomy plantas plante plante de culture plants productividad productivity trigo wheats