Reaction of rape cultivars on different levels of the crop production system

analytical methods brassica napus caracteres de rendimiento composante de rendement contenido proteico crop yield cropping systems crops crude fat cultivos cultivos de invierno culture d'hiver field experimentation graine graisse brute grasa bruta hiver invierno nutrientes nutrients plant production plante de culture poland pologne polonia protein content rendement rendement des cultures rendimiento rendimiento de cultivos seeds semilla sistemas de cultivo statistical methods substance nutritive technique analytique variedades varieties winter winter crops yield components yields