PROMOTION OF PLANT-GROWTH AND NUTRIENT-UP TAKE OF CRUCIFEROUS OIL ANDINTERCROPS BY INOCULATED RHIZOSPHERE MICROORGANISMS

The vegetative growth of rape, oil radish and mustard was repeatedly s timulated by isolates of Pseudomonas fluorescens (PsIA12), P. putida ( A1 A2), Stenotrophomonas maltophilia (PsIB2, PsI2), Agrobacterium rhiz ogenes (A1A4) and Rhizobium trifolii (R39) by improved root developmen t and nutrient uptake (N, P, K, Mg) in pot and field experiments on lo amy sand and sandy loam at different yield levels. The seed yield of r ape could be increased only by 2 isolates (PsIA12, PsIB2). The growth stimulating bacteria produced phytohormones(auxins and partly cytokini ns). No direct relations between plant growth stimulation and the pote ntial microbial metabolic activities nitrogenase,nitrate reductase, P- mobilization, pectinase, cellulase could be found. Effective bacteria are in close association with the plants and can survive in the rhizos phere.