田莉 王杰 吕双双 潘方珍 陈玲霞 李春生

摘要  通过对甘薯叶面喷施富有机硒植物营养剂，研究不同喷施用量对甘薯果实内硒含量的影响。结果表明试验所选取的3组用量对甘薯富硒都有一定的促进作用，随着喷施用量的提高，甘薯硒含量逐渐提高，其中4 500 ml/（hm2·次）喷施对甘薯富硒的促进作用最大。且在试验过程中发现甘薯植株内硒元素在整个生长过程中从叶片向甘薯果实中转移，同时喷施富有机硒植物营养剂能够明显抑制甘薯对重金属Cd的吸收，随着富有机硒营养剂用量的增加，甘薯内重金属镉的吸收量逐渐降低。对甘薯进行叶面喷施富有机硒营养剂能够促进甘薯对硒元素的吸收，且在试验用量范围内，随着用量提高，甘薯内硒含量也随之提高，同时可在一定程度上抑制重金属Cd的吸收。

关键词  甘薯;硒;吸收;叶面喷施

中图分类号  S  531文献标识码  A

文章编号  0517-6611（2020）04-0150-04

doi：10.3969/j.issn.0517-6611.2020.04.044

开放科学（资源服务）标识码（OSID）：

Study on Development of Selenium-enriched Sweet Potato by Foliar Application

TIAN Li，WANG Jie，L Shuang-shuang et al  （Zhejiang Institute of Geological & Mineral Resources，Key Laboratory of Clay Minerals， Ministry of Land and Resources，Engineering Research Center of Non-metallic Minerals of Zhejiang Province，Hangzhou，Zhejiang 310007）

Abstract  The effects of different spraying dosages on selenium content in sweet potato fruits were studied by spraying the organic selenium plant nutrient on the sweet potato leaf surface.The results showed that the dosage of the three groups selected in the experiment had a certain promoting effect on selenium enrichment in sweet potato.With the increase of spraying dosage， the selenium content in sweet potato increased gradually， and the effect of 4 500 mL/hm2 and sub-spraying on selenium enrichment in sweet potato had the greatest promotion effect.It was also found that selenium could be transferred from the leaves to the sweet potato fruits during the whole growth process of the sweet potato plants.At the same time， spraying the selenium-enriched plant nutrient could inhibit the absorption of heavy metals by sweet potato to some extent.And cadmium was found to be more obvious during the experiment.With the increase of the dosage of organic selenium nutrient， the absorption of heavy metal cadmium in sweet potato gradually decreased.Based on the above test results， foliar application of organic selenium nutrient to sweet potato can promote the absorption of selenium by sweet potato， and within the test dosage range， with the increase of spraying concentration， the selenium content in sweet potato will also increase.At the same time， the absorption of heavy metals can be inhibited to a certain extent.

Key words  Sweet potato;Selenium;Absorption;Foliage spray

甘薯是世界公認的营养食品和保健食品，而且有关专家评价甘薯为“21世纪最理想的食物”。相对于米、面而言，甘薯为生理碱性食物，且甘薯含有大量的淀粉、可溶性糖、多种维生素、胡萝卜素、膳食纤维和多种氨基酸等物质[1]。另外甘薯还含有钙、铁、磷、钾、硒等矿物质，同时还含有黏液蛋白等物质，具有防止结肠和乳腺肿瘤的作用，而且可以延年益寿、强身健体、增强免疫力[2]。我国是农业大国，甘薯的种植面积和产量均居世界首位，但我国又是世界公认的缺硒大国，因此通过对甘薯进行外加硒源施肥，提高甘薯产量及富硒量，可对我国普遍存在的缺硒问题起到很好的缓解作用[3-4]。……