<p>The management of sewage sludge (also known as biosolid) is a significant environmental challenge, with global production estimated at over 45&#xa0;million tons annually, raising concerns about sustainable disposal and utilization. In this study, an attempt was made to assess the effect of sewage sludge amendment (0, 10, 20, 30, and 40&#xa0;g kg^− 1 of soil) on turnip (<i>Brassica rapa</i> var. <i>rapa</i> L.) cultivation using pot-scale experiments. Greenhouse experiments were conducted in triplicate with a completely randomized block design. The results demonstrated that sewage sludge amendment significantly enhanced the soil properties and morphological and yield parameters of cultivated turnip. Specifically, a 10–20&#xa0;g kg^− 1 treatment of sewage sludge resulted in the greatest plant height (21.20&#xa0;cm), number of leaves (5.85 leaf/plant), leaf area (196.25 cm²/plant), chlorophyll content (37.54 SPAD readings), turnip shoot biomass (0.93&#xa0;g DM/plant), root biomass (0.25&#xa0;g DM/plant), total biomass (1.18&#xa0;g DM/plant), and absolute relative growth rate (0.02&#xa0;g DM/day), respectively. The contents of eight heavy metals (Cd, Co, Cu, Fe, Mn, Ni, Pb, and Zn) in the root and shoot parts of the turnip plant were also found to be significantly (<i>p</i> &lt; 0.05) elevated in proportion to the increasing dose of sewage sludge. The concentration of selected HMs in shoot and root parts of cultivated turnip was below the safe limit of FAO/WHO standards except for Cd, Cu, Pb, and Zn which need further investigation and mitigation measures to avoid their high uptake. However, the phytotoxic ranges of all HMs were found to be within acceptable levels. Overall, this study suggests that sewage sludge fertilization could be employed to cultivate turnip up to a 20&#xa0;g kg^− 1 dose, thereby contributing to its sustainable management.</p>