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| Effects of different conditioners on reducing cadmium and increasing selenium in rice in selenium-rich and high-cadmium farmland rice |
| Received:December 26, 2022 |
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| KeyWord:selenium-enriched soil;cadmium;rice;absorption and transport;enrichment coefficient;soil conditioner |
| Author Name | Affiliation | E-mail | | CAO Chi | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | BAO Guangling | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | TAO Ronghao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Yao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MA Zhongwen | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WU Chenglong | Selenium-enriched Agricultural Experimental Station of Shitai Agricultural Technology Extension Center, Shitai 245100, China | | | LIAO Xia | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MA Youhua | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yhma@ahau.edu.cn |
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| Abstract: |
| The aim of the present study is to investigate the effects of different remedial measures on reducing cadmium and increasing selenium in rice in a high selenium and cadmium background area. Under field experimental conditions, the effects of different soil conditioners on rice yield, cadmium and selenium uptake and transportation in different parts of rice, soil pH, available cadmium content, and chemical forms of cadmium were analyzed. The yield of all treatments except single application of calcium magnesium phosphate fertilizer increased significantly compared with the control(11.95%-25.98%). The cadmium content of rice grain was decreased and the selenium content was increased by different conditioners compared with the control. The selenium content in rice grain reached the standard of "selenium-enriched rice" under all treatments. The cadmium content in rice grain treated with other conditioners except lime was below the National Food Safety Standard(0.2 mg·kg-1). The bio-organic fertilizer treatment had the best effect on reducing cadmium and increasing selenium in rice. Compared with the control, the pH value of the soil with different conditioners increased by 0.10-0.61 units, the content of available cadmium in the soil decreased, and soil cadmium was transformed into residual cadmium. The weak acid extractable fraction of cadmium in the soil treated with Senmeisi material decreased by 17.59%. The maximum reduction of soil cadmium reducible form was 40.13% under bio-organic fertilizer treatment. The input-output ratios under the treatments of calcium magnesium phosphate fertilizer + potassium sulfate, Senmeisi, and bio-organic fertilizer were significantly higher than the other treatments, being 3.39, 3.31, and 3.18 respectively. In conclusion, when selenium-rich rice is produced in soil with high background of selenium and cadmium, the application of bio-organic fertilizer could effectively reduce the availability of soil cadmium, inhibit the migration and transportation of cadmium in rice, and promote the enrichment of selenium in grains, and have high achievable economic benefits. |
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