Yield, weed and plant nutrient contents in a five-year crop rotation with organically grown vegetables

abonos verdes agricultura alternativa agriculture alternative allium ampeloprasum alternative agriculture brassica oleracea italica chemical composition climatic factors composition chimique crop yield daucus carota engrais vert facteur climatique farmyard manure feuille fumier green manures hojas leaves malezas mauvaise herbe noruega norway nutrition des plantes nutritive value plant nutrition rendement des cultures rendimiento de cultivos rotation culturale rotational cropping valeur nutritive valor nutritivo vigna unguiculata sesquipedalis weeding weeds