[Influence of different catch crops after grain peas on the nitrate content in the soil and growth of the following crop (potatoes, wheat)]

agriculture biologique azote bavaria carence du sol catch cropping cultivo intermedio cultivos de invierno culture d'hiver deficiencias del suelo ecologia ecologie ecology encuestas evaluation experimentation fabrication des engrais ferme pilote fertilidad del suelo fertilisation fertilizer application fertilizer technology fincas experimentales fixation de l'azote gestion du sol grain legumes leaching leguminosas de grano lessivage du sol manejo del suelo nitrate nitrates nitratos nitrogen nitrogen content nitrogen fixation organic agriculture pilot farms pisum sativum rendement rendimiento rotation culturale rotational cropping soil deficiencies soil fertility soil management solanum tuberosum surveys teneur en azote triticum winter crops yields