Study on using natural zeolite, biochar and compost to reduce lead and cadimium accumulation in vegetables due to the use of contaminated water

Abstract

    Water pollution on irrigation systems has been affecting agricultural products. The article proposes solutions to reduce the accumulation of heavy metals Pb and Cd in leaf vegetables due to the use of polluted irrigation water using some natural materials zeolite clay minerals, biochar and straw manure.
The study contributes to improving the safe quality of agricultural products and protecting public health. The study carried out green house experiments with irrigation water of Pb 0.5ppm and Cd 0.1ppm. Spinach and vegetables were planted 3 seasons with amendments including zeolite, biochar and straw manure. The results showed that the addition of 3% zeolite reduced mobile contents of Pb by 39.9-46.7% and Cd by 57.1-62.5%. Adding 5% biochar and straw manure reduced mobile content of Pb by 19.48-21.47% and Cd by 37.61-39.47% in soil. Adding 2-3% zeolite clay minerals (400-600 kg/ha) reduced Pb accumulation about 60.3-70.5 % and Cd about 60.3-70.5 % in vegetable leaves. Adding straw and biochar 5% (100 kg/ha) can reduce Pb accumulation by 40-45% and Cd accumulation by 45-50% in leaves.