Response of sugar beet to inoculation with n2-unfixing and n2-fixing bacteria of Pseudomonas genus in leached chernozem

Significant increase of sugar beet yield and N-uptake in plants inoculated with selected pure cultures of N2-unfixing bacterium P. fluorescens 20 and N2-fixing bacterium P. putida 23 and mixed bacterial culture have been found in pot experiment and in 2-year pot experiment in a field conditions in leached chernozem. Inoculation with N2-fixing bacterium P. putida 23 led to maximum effect as a result of improving of nitrogen nutrition of plants. Increases of effect of inoculation with pure cultures of bacteria in the second year have been found. The soil and experimental conditions influence significantly the efficiency of inoculation.