| Autor: |
Yao JF; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China., Liu YL; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China., Zhang WY; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China., Yan; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China., Li N; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China., Tie BQ; College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China.; Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China. |
| Abstrakt: |
This study investigated the impact of single and combined applications of three foliar inhibitors on the accumulation of cadmium （Cd） and arsenic （As） in rice grains. Two rice varieties, Songyazao 1 （for early rice） and Wuxiang Youyue （for late rice）, were selected for this experiment. We established nine treatments using a pot experiment method, including a control （CK） treated with no foliar inhibitor and three individual foliar inhibitors： cysteine （L-Cys）, potassium sulfide （K 2 S）, and dipotassium hydrogen phosphate （K 2 HPO 4 ）. We then combined the applications of two foliar inhibitors： L-Cys with low/high concentrations of K 2 S, L-Cys with low/high concentrations of K 2 HPO 4 , and K 2 S with a low concentration of K 2 HPO 4 . The results showed that the single and combined applications of foliar inhibitors reduced Cd and As concentrations in rice grains. The Cd content in brown rice treated with L-Cys and K 2 S/K 2 HPO 4 was reduced below the standard limit for food safety of 0.20 mg·kg -1 . Compared to the CK, the content of inorganic arsenic （IAs） in early and late rice decreased by 4.68%-56.75% and 2.84%-16.91%, respectively. Foliar inhibitors applied individually or in combinations facilitated the transport of Cd and As from the stem to the leaf while inhibiting their transport from the leaf to the rice grain. This resulted in the sequestration of Cd and As within the leaf cell wall, ultimately reducing the content of these elements in rice grains. Among the combination treatments, the application of L-Cys and high-concentration K 2 S achieved the best results. The Cd content in early and late rice decreased by 37.64% and 26.37%, respectively, falling below 0.20 mg·kg -1 . The IAs content in early and late rice was reduced to 0.10 mg·kg -1 （below 0.20 mg·kg -1 ） and 0.24 mg·kg -1 , respectively. This study provides a valuable theoretical foundation and empirical data to support the achievement of safe rice production practices. |
