Rohtas KumarRachna2023-05-302023-05-302022-07https://krishikosh.egranth.ac.in/handle/1/5810197466In order to study the effect of different sewage sludge application rate on soil properties, nutrient content and yield of mung bean, an experiment was carried out in the screen house during kharif season 2020-21. The results of the experiment revealed that increasing rate of sewage sludge application decreased the soil pH from 8.47 to 8.02 and increased the electrical conductivity from 0.09 to 0.16 dS m-1 and organic carbon content 0.30 to 0.84 %. The available N, P and K content of the soil increased 185.00 to 247.00, 8.86 to 15.86 and 295.80 to 377.13 kg ha-1, respectively and the DTPA extractable Zn, Cu, Fe and Mn content of the soil also increased from 1.06 to 2.56, 0.27 to 2.63, 3.06 to 6.66 and 3.80 to 6.93 mg kg-1, respectively with increasing rate of sewage sludge from 0 to 20.0 t ha-1. The content of cadmium, lead, nickel, cobalt and chromium in the soil increased with each successive level of sewage sludge application but their content remained below the permissible limit. The grain and straw yield of mung bean increased significantly in all the treatments over control and the magnitude of increase in grain and straw yield was 14.67 to 44.92% and 11.03 to 68.96 %, respectively with increasing sewage sludge application rates from 2.5 to 20 t ha-1. The uptake of nutrients by grain and straw increased with increasing rate of sewage sludge application. The uptake of N, P and K by grain increased from 122.69 to 189.91, 9.74 to 17.34 and 11.22 to 23.12 mg pot-1 and in straw their uptake increased from 32.77 to 69.53, 3.86 to 16.81 and 12.66 to 28.4 mg pot-1, respectively. The uptake of Zn, Cu, Fe and Mn by grain and straw also increased from 21.86 to 30.36 and 16.86 to 25.00; 3.93 to 5.03 and 3.50 to 4.77; 52.33 to 70.86; 74.66 to 93.77 and 3.73 to 7.60 and 23.66 to 46.00 μg pot-1, respectively. The content of Cd, Pb, Ni, Co and Cr slightly increased in all the treatments with increasing rate of sewage sludge application.EnglishThesis