pse-200602-0004 ArticleInAPeriodical 2006 Plant, Soil and Environment 52 2 72-77 SchererH.W. PacynaS. MantheyN. SchulzM. Sulphur supply to peas (Pisum sativum L.) influences symbiotic N₂ fixation In a pot experiment (culture substrate: perlite with a granulometric composition 0-3 mm) with peas (Pisum sativum L.) we studied the influence of sulphur supply on S and N concentrations, yield formation, symbiotic N₂ fixation and available amounts of glucose and sucrose. Under S deficiency conditions S and N concentrations as well as the amounts of glucose and sucrose in shoots and nodules were significantly reduced. We assume that the reduced amounts of available photosynthate with suboptimal S supply could become limiting to energy production and as carbon skeletons for ammonia assimilation, and therefore cause a lower N₂ fixation and a reduced yield formation.