Comparison of weed infestation of some crops cultivated in organic and intensive farming systems at Jesionowo on West Pomerania [Poland]

agriculture biologique agriculture intensive barley cebada cereal crops cultivos de cereales cultivos de invierno cultivos de primavera culture d'hiver culture de printemps disponibilidad de nutrientes estabilidad exploitation agricole explotaciones agrarias farming systems farms infestation intensive farming malezas mauvaise herbe nutrient availability organic agriculture orge papa ph poland pologne polonia pomme de terre potatoes sampling soil soil texture sol spring crops stabilite stability suelo textura del suelo texture du sol trigo weeds wheats winter crops