In-situ Stabilization Of Heavy Metal Pollution In Farmland Soils

Remediation of heavy metal contaminated farmlandm as become a top priority.Based on the previous experiment,two kinds of stabilizer materials,stabilizer A and stabilizer B were screened for the characteristics of calcareous soil in the north.The two stabilizers were tested for wheat and maize season trials.This paper studies the effect of repairing two stabilizers and explore its repair mechanisms.In order to provide technical support for contaminated soil in-situ stabilization repair.The results showed as follows:1.Stabilizer A and Stabilizer B could increase wheat yield.The yield of wheat was increased by 8.11% under the high treatment of stabilizer A,and the yield of wheat was increased by 8.55% under the high treatment of stabilizer B.2.Under the field experiment conditions,stabilizer A and stabilizer B could decrease the contents of Pb and Cd in wheat kernel.Under the high amount of stabilizer A,the content of Pb in wheat grain Aikang 58 and Luomai 23 were decreased by 44.93% and 35.88%,respectively;The contents of Cd in wheat grain Aikang 58 and Luomai 23 were reduced by 19.03% and 15.64%,respectively.Under the high amount of stabilizer B,the content of Pb in wheat kernel Aikang 58 and Luomai 23 were reduced by 52.38% and 22.53%,respectively;The Cd content in wheat grain Aikang 58 and Luomai 23 were reduced by 14.50% and 8.17%,respectively.3.Stabilizer A and Stabilizer B could reduce the contents of Pb and Cd in maize kernels.The contents of Pb and Cd in maize were reduced by 35.52% and 51.04% by using high stability A.The Pb and Cd contents in maize grain were reduced by32.59% and 51.04% by using the high B of stabilizer,respectively.4.Under the field experiment conditions,Stabilizer A and Stabilizer B could reduce valid state lead and cadmium in soil during jointing stage,filling stage and ripening stage,and could reduce the Pb and Cd contents in roots and stems and leaves of wheat.In the case of high amount of stabilizer A and stabilizer B,the valid state lead and cadmium in soil,the Pb and Cd contents in root and stem were all the most decreased.5.Stabilizer A and Stabilizer B could reduce valid state lead and cadmium inmaize soil,and could reduce Pb and Cd contents in roots and shoots.The contents of Pb and Cd in maize roots,stems and leaves,and grains were root> stem> grains.