[Influence of various trap crops as well as of calcium and calcium cyanamide on the soil contamination with Spongospora subterranea, the exciter of the powdery scab of potatoes]

agentes nocivos agricultural chemicals agricultural lime amendement du sol calcium carbonate calcium cyanamide carbonate carbonate de calcium carbonates carbonato de calcio carbonatos champignon chaux agricole cianamidas crops cultivos cyanamide cyanamide calcique cyanamides diseases economic plants enfermedades fungosas engrais enmiendas del suelo facteur nuisible fertilizantes nitrogenados fertilizers fungi hortalizas (plantas) injurious factors inorganic compounds mycose mycoses nitrogen fertilizers organic compounds papa plantas plantas feculentas plante plante de culture plante racine plants pomme de terre potatoes produit agrochimique rona root crops root vegetables sales salts scabs sel soil amendments spongospora starch crops symptome symptoms tavelure vegetable crops