Potential weed infestation of the soil with application of liquid swine manure

capa arable del suelo cerdo couche arable cultivos de invierno cultivos de primavera culture d'hiver culture de printemps engrais organique fertilisation fertilizer application hordeum vulgare infestation liquid manures malezas mauvaise herbe organic fertilizers porcin purin solanum tuberosum spring crops swine top soil triticum aestivum weeds winter crops zea mays