Relations between soil density and cereal yield [spring traffic on ploughed soil, traffic intensities, penetrometer resistances, soil strength, degree of compactness]

agricultural chemicals agronomic characters application methods apport d'engrais apport en couverture avenas avoine barley cebada cereales cereals chemicophysical properties compactage du sol crops cultivos cultivos de grano densidad del suelo economic plants engrais escandinavia esparcido europa europe fertilizantes nitrogenados fertilizers grain crops methode methods nitrogen fertilizers noruega norway oats orge plantas plante plante de culture plants productividad productivity produit agrochimique profitability rendement rendimiento rentabilidad scandinavia scandinavie soil compaction soil density soil mechanics soil physicochemical properties spring wheat trigo trigo de primavera wheats yields