EFFICACY OF SULFUR AND BACTERIA RHIZOBIUM LEGUMINOSARUM ON SOME SOIL TRAITS AND THE GROWTH OF BROAD BEAN PLANT

The experiment was conducted in the fields of the Agricultural Division - University of Kufa during the season 2022-2021 with the aim of studying the use of a inoculum of Rhizobium leguminosarum bacteria fortified with sulfur for the purpose of producing an efficient bio-fertilizer and then using the bio-fertilizer produced in an agricultural experiment to know its effects on soil and Vicia faba L. The results showed that the treatment of using the 5% sulfur-enhanced bacterial inoculum was superior in reducing soil pH values and increasing the degree of electrical conductivity on the rest of the treatments. As for the harvest stage 6.73, as for the electrical conductivity in the flowering stage, the lowest rate was 3.85 and 3.90 dsm-1 at the flowering and harvest stages, respectively. The treatment of adding sulfur 5% in the vegetative and root dry weight was excelled on the rest of the treatments, reaching 49.30 (gm. plant-1) for the vegetative group and 15.89 (gm. plant-1) for the root system. While the treatment of adding sulfur 5% excelled in the number of Rhizobia bacteria in the soil over the rest of the treatments, the number of Rhizobia bacteria reached 139.67 (106×CFU.gm of dry soil-1). While the concentration of N, P and S in vegetative of the broad bean plant reached 3.45%, 0.63% and 2.41%, respectively.