叶面喷施有机富硒肥对万源某地区茶叶富硒降镉的影响

Effect of Se-Enriched Foliar Fertilizer on Se-Enrichment and Cd-Reduction in Tea in Region of Wanyuan

评价6种不同浓度的有机富硒肥对轻度镉污染的茶园中茶叶富硒降镉的调控效果。结果表明,不同浓度的有机富硒叶面肥喷施茶树后,茶叶中硒含量(包括对照组茶叶)均达到国家富硒茶标准,其中浓度为0.8 g/L的叶面肥对茶叶的富硒效果最为显著。所有试验组茶叶中均含有一定量的重金属镉,但镉的含量均符合质量标准。叶面肥浓度为0.2 g/L和0.4 g/L时,试验组茶叶中镉含量降低比较明显,降低了0.005~0.01 mg/kg,叶面肥浓度在0.6~1.0 g/L范围时,茶叶中镉含量逐渐增加。试验田以试验研究的有机富硒叶面肥浓度为0.6 g/L,喷施1个周期生产的茶叶富硒量高且镉含量最低。

The effects of six different concentrations of Se-enriched fertilizer on the Se-enriched and Cd- enriched in tea plants in mild Cd-polluted paddy field were evaluated in this study. The results showed that, after spraying tea trees with different concentrations of organic Se-enriched foliar fertilizer, the content of selenium in tea (including control tea) reached the national standard of Se- enriched tea. Among them, the foliar fertilizer with a concentration of 0.8 g/L had the most significant effect on Se-enriched of tea. All the tea samples in the test group contained a certain amount of heavy metal cadmium, but the content of cadmium met the quality standard. When the concentration of foliar fertilizer was 0.2 g/L and 0.4 g/L, the cadmium content in tea of the test group was significantly reduced, which decreased by 0.005 mg/kg - 0.01 mg/kg. Cadmium content in tea increased gradually when foliar fertilizer concentration ranged from 0.6 g/L to 1.0 g/L. In the experimental field, the concentration of Se-enriched fertilizer was 0.6 g/L, and the selenium content of tea produced by spraying one cycle was rich and the content of cadmium was the lowest.