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| Effects of straw returning with different lime dosages on Cd accumulation in rice |
| Received:September 28, 2020 |
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| KeyWord:straw returning;lime;rice;Cd;yield |
| Author Name | Affiliation | | YANG Ding-qing | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | LI Xia | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | ZHOU Ya | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | LUO Li-hui | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | XIE Yong-hong | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | WANG Peng | Analysis and Testing Centre of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China | | LI Xu-yi | Crop Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu 610066, China |
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| Abstract: |
| Straw returning is an important measure to improve soil fertility and increase crop yield, but there is a risk of increasing rice cadmium（Cd）concentration. In order to study the rational utilization of straw resources, a field experiment on straw returning combined with lime was conducted to evaluate the effects of different lime-straw treatments on Cd uptake. Treatments included no-straw returning, straw returning, and straw returning with four lime dosages（600, 1 200, 1 800 kg·hm-2, and 2 400 kg·hm-2）. Compared with the no-straw returning treatment, the straw returning treatment increased rice Cd, soil dissolved organic carbon, and available Cd content by 18.1%, 28.5%~95.7%, and 7.7%~18.9%, respectively. Compared with straw returning treatment, straw returning with lime treatments reduced rice Cd contents by 11.2%~44.9% through increasing soil pH by 0.15~0.85 units, reducing soil DOC and available Cd contents by 6.6%~ 29.3% and 11.4%~38.6%, respectively. Straw returning with lime at 1 800 kg·hm-2 and 2 400 kg·hm-2 treatments significantly reduced rice Cd contents（P<0.05）. With an increase in lime dosage, the rice Cd contents decreased to levels below 0.2 mg·kg-1, as recommended by the National Food Safety Standard-Limits of Contaminants in Food（GB 2762—2017）. Moreover, straw returning with lime treatments increased rice yields by 3.3%~6.2%（P>0.05）. With a careful consideration of environmental impacts and economic benefits, the combination of straw returning with 1 800 kg·hm-2 lime is a high-yielding and ecologically safe intervention for straw resource utilization. |
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