Effects of exogenous organic selenium and nano-selenium on growth,quality,and Se content in ginger

KUANG Yidi; TANG Chun; ZHANG Qinglin; YANG Hong; ZHOU Jie; QI Chuandong; GUO Fengling; ZHU Jin; WU Jinping

doi:10.16861/j.cnki.zggc.2025.0209

Abstract：Selenium(Se)is an essential trace element for the human body and must be acquired externally through the diet.Thus,developing selenium-enriched functional crops has become a key strategy for selenium supplementation.In this study,Fengtou ginger was used as the test material.A field experiment was conducted involving foliar spraying of organic selenium and nano-selenium at concentrations ranging from 120 to 200 mg·L-1,with spraying clear water as the control(CK).The effects of different selenium sources on ginger growth,quality,and selenium accumulation were analyzed.The results indicated that foliar application of 120 mg·L-1nano-selenium resulted in a rhizome fresh mass of 1180 g per ginger plant,which was significantly 76.12％higher than that of the CK.In contrast,spraying 200 mg·L-1 organic selenium increased ginger yield by 28.36％.For the treatment with 200 mg·L-1 nano-selenium,the soluble sugar content significantly increased 0.16 percent points than that of CK,whereas the soluble protein content decreased by 0.63％.Although the 160 mg·L-1 organic selenium treatment inhibited protein synthesis,the organic selenium content in ginger rhizomes reached 0.225 mg·kg-1,a significant increase of 114.29％compared with CK.Nano-selenium treatments significantly reduced soil pH to the range of 5.09-5.32 and activated soil nitrogen,phosphorus,and potassium(with available potassi-um content decreasing significantly by 47.69％).In contrast,organic selenium exhibited a bidirectional regulatory effect on soil pH.Considering yield,quality,and soil environmental impacts comprehensively,160 mg·L-1 organic selenium was identified as the optimal concentration for selenium enrichment(achieving the peak organic selenium content in ginger).However,200 mg·L-1 nano-selenium was more suitable for functional ginger production,as it not only increased yield by 25.37％but also enhanced selenium fortification and soil nutrient activation.