Effektivitätserhöhung der Rhizobium-Inokulation bei Erbse durch Kombination von Rhizobium leguminosarum biovar. viceae mit R. leguminosarum biovar. trifolii

Abstract

Summary By combined inoculation of a pea-plant-specific Rhizobium leguminosarum biovar. viceae (IMET 11417) strain together with a strain, isolated from red clover (R. leguminosarum biovar. trifolii, IMET 43726), the shoot dry matter at the time of flowering and the grain yield in field experiments was increased. The combined inoculation stimulated nodulation, nitrogenase activity and leghemoglobin-content in the nodules and increased the root surface of young pea plants. The strain IMET 43726 can not produce nodules on pea plants. It's possible that his ability to produce in water dissolveable cytokinins are responsible for the growth stimulation effects. Causes for growth stimulation are: — increased N2-fixation by prolongation of the N2-fixation periode, — improved root surface for a better mineral nutrition and — a resistance against root pathogens.