Weed infestation of winter wheat grown in organic and conventional farm in the area of Elk Lakeland [Poland]

agricultura alternativa agricultura tradicional agriculture alternative agriculture traditionnelle alternative agriculture biodiversidad biodiversity biomasa biomass biomasse campo champ crop yield crops cultivos cultivos de invierno culture d'hiver especies exploitation agricole explotaciones agrarias farming systems farms fields grain granos plante de culture poland pologne polonia rendement des cultures rendimiento de cultivos soil texture species textura del suelo texture du sol traditional farming trigo triticum wheats winter crops