Fertilization of stinging nettle (Urtica dioica L.). Effects on growth, yield and concentrations of N, NO3-N, P, K, Mg and Ca

abonos compuestos abonos verdes azote calcio calcium chemical composition composition chimique compound fertilizers contenido de materia seca crop yield cultivos alimenticios drug plants dry matter content engrais vert farmyard manure fertilisation fertilizer application food crops fosforo fumier green manures harvesting date magnesio magnesium nitrogen noruega norway phosphore phosphorus plantas medicinales plante alimentaire plante medicinale potasio potassium rendement des cultures rendimiento de cultivos urtica dioica