[Trials with different fertilizing methods for cereals in connection with sowing plough and direct sowing machine - 1995 in Stange in Hedmark]

abonos compuestos aradura compound fertilizers crop yield deep placement direct sowing equipment equipo harrowing hersage hordeum labour localisation en profondeur noruega norway ploughing rastreo rendement des cultures rendimiento de cultivos rolling roulage rulado semis direct siembra directa