Document Type : Research Paper
Department of Irrigation and Reclamation Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.
1- Department of Water Engineering, Faculty of Agricultural Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
A factorial experiment was conducted in a randomized complete block design with three replications in 2020 at Babolsar city. Treatments include irrigation with well water (W1), irrigation with mixing 25% of effluent and 75% of well water (W2), irrigation with the mixing of 50% of effluent and 50% of well water (W3), irrigation with mixing of 75% of effluent and 25% of water well (W4), irrigation with 100% effluent (W5) under magnetic field (I1) and without magnetic field effect (I2) was. At the end of the period, the elements lead, cadmium, zinc and nickel were measured in aerial parts and seeds of maize. The results showed that the effect of irrigation type and water and effluent mixing on concentration of all elements in aerial parts and seeds of maize was significant at the level of one percent probability. By applying a magnetic field, the concentrations of lead, cadmium, zinc and nickel in the aerial parts of plant decreased by 17.84, 15.9, 14.22 and 13.92% compared to non-magnetic treatment, respectively. With increasing the percentage of effluent used in irrigation, the concentration of all elements increased significantly. The maximum concentration of elements in aerial parts and seeds of maize was related to zinc, amounts of 93.19 and 74.32 mg/kg respectively. The lowest concentrations of heavy metal uptake in aerial parts and seeds of maize were cadmium (0.73 mg/kg) and nickel (3.61 mg/kg), respectively which were all obtained from W5 treatment. Therefore, by using magnetic technology, the accumulation of heavy metals in effluents in the soil can be reduced and its absorption by maize can be prevented. Due to the high uptake of elements by the maize plant, when irrigating with effluents of the water treatment plant, it is advisable to select plants that have less potential for the accumulation of heavy metals.