The Effect of Irrigation with Magnetically Treated Effluent on Chemical Properties and Soil Heavy Metals

Increase in population and limitation of food resources, leads to decline accessing to agricultural water and soil resources and faced human beings with the great challenge of food security and regional and international crises. Disorders in the plant due to heavy metal toxicity in plants may eventually reduce plant growth. One of the methods that can be applyed to remediate the soil is using of magnetic water. In this study, the effect of using magnetically treated effluent on the chemical properties and traceability of soil heavy metals was investigated. For this purpose, 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 (I2). The results showed that the effect of irrigation type and water and effluent mixing on electrical conductivity, solutes, and heavy metals in the soil at different depths was significant at 1% probability level. On average, irrigation with magnetic water reduced electrical conductivity by 30.43%, lead by 35.25%, and cadmium by 56.11% in the soil profile. In treatments with higher effluent mixing percentages, the number of solutes increased in different soil depths, which was due to higher amounts of elements, especially heavy metals in the effluent. Therefore, by using magnetic technology to reduce the solutes and heavy metals in the soil, provided the conditions for better cultivation in terms of reducing the toxicity of plants due to less absorbtion of heavy metals.