Characteristics of crop production technologie on farms in the Sudety Mountains

abonos npk agriculture de montagne application rates cantidad de semilla requerida cereal crops cereales cereals chemical control crop yield cultivos de cereales date de semis dose d'application engrais npk explotaciones privadas fecha de siembra fertilisation fertilizer application lutte chimique mountain farming npk fertilizers pesticide pesticides plaguicidas plant production plante racine poland pologne polonia private farms remolacha azucarera rendement des cultures rendimiento de cultivos root crops root vegetables sowing date sowing rates sugar beet