Effect of Silicon-Calcium Fertilizer on Pb and Cd Absorption by Rice in Heavy Metal Polluted Farmland

JIA Qian; HU Min; ZHANG Yangyang; MENG Yuanduo; LI Xiaokun; CONG Rihuan; REN Tao

doi:10.3969/j.issn.1003-6504.2017.06.005

Abstract：A pot experiment was conducted to study the effects of sihcon-calcium fertilizer application on rice growth,Pb/Cd absorption and accumulation,silicon contents,soil pH and forms of heavy metals in soil under rice rotation cultivation.The results showed that the application of silicon-calcium fertilizer could increase yield of rice,compared with treatment of check,the rice yield increased by 51.9％.Pb contents in stems,leaves and grains of rice and Cd contents in stems and grains of rice was decreased significantly after the addition of sihcon-calcium fertilizer.Compared with treatment of check,Pb contents in stems,leaves and grains of rice was decreased by 50.9％,56.3％ and 24.3％,Cd in stems and grains of rice contents was decreased by 36.1％ and 60.4％;silicon-calcium fertilizer may be hinder the transfer of Pb from root to stem and the transfer of Cd from leaf to grain in rice.Silicon-calcium fertilizer application increase silicon contents in each part of rice.The reason for the reduction of Pb/Cd contents in rice may be silicon deposition.Si contents and heavy metals contents in each part of rice present the obvious negative correlation.After the rice cultivation,Pb and Cd contents in soil decreased,Pb and Cd contents of different forms in soil has no difference between check treatment and silicon-calcium fertilizer treatment.There is no promotion in transformation of different forms of heavy metals in soil after the application of silicon-calcium fertilizer.With planting rice on lead/cadmium pollution soil,we can reduce the content of Pb/Cd in rice so as to reduce the risk of lead/cadmium pollution by applying the silicon-calcium fertilizer.