Combined Application of Biochar and Lime: Effect on Reducing Cadmium and Lead Accumulation in Rice

doi:10.11924/j.issn.1000-6850.casb16120033

Abstract

Abstract: To understand the effect of combined application of biochar (BC) and lime (LM) on the accumulation of heavy metals in rice, we chose 2 kinds of soil (slight acid soil and acid soil) with different acidities as pot experimental soil for rice growth, to test the effects by the application of 6 different combined dosages of BC and LM( 6 treatments including 0.00%BC+0.00%LM, 0.40%BC+0.00%LM, 0.30%BC+0.10%LM, 0.20%BC+ 0.20%LM, 0.10%BC+0.30%LM, and 0.00%BC+0.40%LM) and analyzed accumulation of Cd and Pb in rice, and the available contents and chemical forms of Cd and Pb in soil. The results showed that: soil pH value increased with increasing proportion of lime under the same application mass of improvement agent; best combined dosages for reducing the accumulation of Cd and Pb in rice and soil available Cd and Pb was 0.20% BC+0.20% for the slight acid soil and 0.10%BC+0.30%LM for the acid soil; application of biochar was better for the maintenance of soil nutrients than the application of lime. Comprehensive consideration of the reduction of Cd and Pb accumulation in rice and the effect on soil improvement, combined application of biochar and lime is better than individual application of lime or biochar.

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