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- Title
Silicon-Calcium Synergetic Alleviation of Cadmium Toxicity in the Paddy Soil-Rice System: from Plot Experiment to Field Demonstration.
- Authors
Zhang, Pengbo; Wei, Xiao; Zhang, Yangzhu; Zhan, Qiang; Bocharnikova, Elena; Matichenkov, Vladimir
- Abstract
Cadmium (Cd) contamination threatens the safety of rice and seriously endangers human health. In plot and field experiments, the effect of combined silicon (Si) and calcium (Ca) application on Cd toxicity and accumulation by rice was investigated in low and moderately Cd-contaminated paddy soils. Two types of Si fertilizers, limestone, and novel composite soil amendment (Si + Ca) were soil-applied before rice planting. The Si + Ca treatment increased rice yield by 1.0 to 6.0% in pot test and by 0.9 to 16.6% in field test and reduced the bioavailable soil Cd by 13.5 to 38.7%. The bioconcentration factor (BCF) of Cd depended on the level of soil contamination, being higher under slight contamination. As a result, the Cd concentration in the control rice exceeded the 0.22 mg kg−1 standard even in low polluted paddy soil. The Si + Ca composite provided the reductions in the grain Cd by 42 to 75%, demonstrating better efficiency than Si or Ca alone. The Si and Ca mostly restrained the Cd root-to-stem transport. Comparative analysis of BCF, translocation factor, and grain Cd under different treatments evidences the synergetic reducing effect of Si + Ca on Cd uptake and accumulation by rice. To alleviate Cd contamination in the paddy soil-rice system, Si + Ca combined application could be effective and worth to be recommended.
- Publication
Water, Air & Soil Pollution, 2022, Vol 233, Issue 9, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-022-05761-z