Soil sample (0-15 cm depth) was collected from Dhamrai, Savar. The sample was air-dried, ground and sieved through 2 mm sieve. The soil had a pH of 7.54 (1:2.5 w/v H2O, Jackson 1965), Electrical Conductivity 49.9 ds/m (1:5 w/v H2O, Jackson 1965), organic carbon 0.156 % (Walkley and Black 1934), organic matter 0.27 %, available nitrogen 0.016% (Kjeldahl extraction, Jackson 1965), available phosphorus 0.042 % (blue color method using ascorbic acid, Olsen et al. 1954), exchangeable potassium 0.030 % (Pratt, 1965), available sulfur 0,0048% (Turbidimetric method, Bardsley and Lancaster 1965), sand 4.66%, silt 68.33 % and clay 27.01 %, textural class- silt loam (Bouyoucos 1962), moisture content was 12.32 % and field capacity was 32.3 % (Gardner 1986). The concentrations of total iron (2310 mg/kg), manganese (421 mg/kg), zinc (75 mg/kg) and copper (26 mg/kg) were determined using an Atomic Absorption Spectrophotometer (AAS) (VARIAN AA240). A pot experiment was carried out in the net house of the Department of Soil, Water and Environment, University of Dhaka from 20th August 2018 to 20th December 2018. Eight kilograms of air dried soil were placed in 10 kg capacity pot providing a drainage hole at the bottom. Eight treatments with three replications were as follows: Control (- Cu and VC), VC5 ton/ha, Cu0.5 kg/ha, Cu1 kg/ha, Cu1.5 kg/ha, Cu0.5 kg/ha + VC5 ton/ha, Cu1 kg/ha + VC5 ton/ha, and Cu1.5 kg/ha + VC5 ton/ha. Pots were arranged in a completely randomized design (CRD). Urea, TSP and MP fertilizers were applied in quantities of 20 kg/ha, 15 kg/ha and 30 kg/ha, respectively in each pot as basal dose. Copper was used as CuSO4.5H2O. Vermicompost was collected from Charfession, Bhola district. The total N, P and K concentrations of vermicompost were 1.10, 0.29 and 0.82%, respectively. Certified seeds of cowpea, Vigna unguiculata, were collected from “Quality Seed Company”, Siddique Bazar, Dhaka. Three healthy seeds were sown to each pot and water was applied up to field capacity. One healthy seedling was kept in each pot. The pots were watered thrice a week in the morning. Plant height, the number of leaf and leaf area per plant were recorded at 60 and 120 days. Fruit number and length were measured and recorded during the harvest of cowpea at 120 days. The plants were harvested as root, stem, leaf and fruit. The roots were washed with tap water and finally with distilled water to remove any adhering particles on the root surface. Samples were air-dried in room temperature and finally oven-dried at 65° C for 48 hours in the laboratory. The dry weight of the samples was recorded and the samples were ground with a mechanical grinder and stored in plastic containers for further chemical analysis. For nitrogen, 0.5 g of yield (fruit) sample was digested in a Kjeldahl digestion flask (Jackson 1965), for P and K 0.5 g yield (fruit) was digested (Jackson 1965). Phosphorus of the digest was determined by vanadomolybdophosphoric yellow color method at 430 nm using spectrophotometer (model DR 5000). Potassium in the digest was determined by using JENWAY flame photometer (model PFP 7). For sulfur 0.5 g yield (fruit) sample was digested with HNO3-HClO4 acid. After digestion the extract was used to determine the total sulfur content by turbidimetric method (Bardsley and Lancaster 1965). For total Cu, Zn, Fe and Mn 0.5 g yield (fruit) sample was digested with HNO3 and HClO4 acid and the total concentrations of Cu, Zn, Fe and Mn were determined by the Atomic Absorption Spectrophotometer (AAS) (VARIAN AA240). LSD test of the results was performed using IBM SPSS, version 25.