叶面施硒对茶叶总硒含量及品质的影响

Effect of Leaf Surface Application of Selenium on Total Selenium Content and Quality of Tea

摘要: 以亚硒酸钠、麦芽硒为叶面硒肥，每种硒肥均配置浓度50 mg/L、100 mg/L、150 mg/L溶液，分别在喷施叶面肥后第5 d、10 d、15 d、20 d、25 d采摘一芽两叶为样品，研究不同种类、不同浓度硒肥在不同采集时间下的富硒效果及对茶叶品质的影响。结果显示，叶面施硒能显著提高茶叶总硒含量，其中叶面施硒10 d后，处理6的总硒含量达到对照组的20.6倍；且叶面施硒后10~20 d各处理的茶叶总硒含量均达到富硒茶水平，可在此阶段采摘茶叶制作富硒茶。同时此阶段处理3、处理6的茶叶百芽重、氨基酸、茶多酚含量均高于对照组，分别是对照组的1.05~1.28倍、1.33~2.2倍、1.07~1.67倍；1.06~1.28倍、1.17~2.07倍、1.07~1.78倍，茶叶品质更高。

Abstract: Sodium selenite and malt selenium were used as foliar selenium fertilizer, and each selenium fertilizer was prepared with 50 mg/L, 100 mg/L and 150 mg/L solutions. One bud and two leaves were picked as samples on the 5th, 10 d, 15 d, 20 d and 25 d after foliar fertilizer spraying, respectively. The effects of different kinds and concentrations of selenium fertilizer on the quality of tea were studied under different collection times. The results showed that leaf surface application of selenium could significantly increase the total selenium content of tea. After 10 days of leaf surface application of selenium, the total selenium content of treatment 6 reached 20.6 times of that of control group. In addition, the total selenium content of each treatment reached the level of selenium-rich tea 10~20 d after leaf surface application of selenium, and the tea can be picked at this stage to make selenium-rich tea. At the same time, the 100 bud weight, amino acid and tea polyphenol contents in treatment 3 and treatment 6 were higher than those in control group, 1.05~1.28 times, 1.33~2.2 times and 1.07~1.67 times, respectively. 1.06~1.28 times, 1.17~2.07 times, 1.07~1.78 times, higher quality tea.