关键词: 硒肥, 施用方式, 燕麦, 硒富集效应

Abstract: 【Objective】To investigate the effects of different selenium fertilizer application methods on selenium enrichment and yield in oats,providing insights for innovative selenium enrichment strategies in oats.【Methods】Seed soaking treatments with organic selenium fertilizer at concentrations of 0（CK）,0.05,0.10,and 0.25 mg/L were conducted. A total of 12 selenium treatments were designed,including two types of selenium fertilizers（organic and inorganic） and six application methods（basal application,spraying,seed soaking,seed soaking+basal application,seed soaking+spraying and basal application+spraying）,the effects on selenium content in oat grains,leaves and stems,selenium utilization efficiency in grains,economic traits per plant,and yield were analyzed.【Results】Selenium content in oat grains,leaves and stems increased with higher concentrations of organic selenium fertilizer used in seed soaking. Compared with treatments of 0.10,0.05 mg/L and CK,the 0.25 mg/L treatment increased grains selenium content by 0.262,1.714 and 2.980 mg/kg,leaves selenium content by 0.613,0.927 and 1.164 mg/kg,and stems selenium content by 0.608,0.686 and 0.686 mg/kg,respectively. The average selenium content in oat grains under organic selenium fertilizer treatments was 1.6 times higher than that under inorganic selenium fertilizer treatments;the basal application+spraying treatment with organic selenium fertilizer was significantly higher than other treatments（P<0.05）,with grains,leaves and stems selenium contents increased by 1.61-4.64,0.88-9.58 and 0.14-6.24 mg/kg,respectively,and selenium utilization efficiency in grains increased by 15.78%-44.80%.【Conclusion】 Seed soaking,basal application and spraying all enhance selenium content in oats,with spraying showing better enrichment effects than basal application or seed soaking,organic selenium fertilizer exhibits superior enrichment effects compared to inorganic selenium fertilizer in oats;the combination of different selenium fertilizers and application methods effectively increases oat selenium content,with the organic selenium fertilizer basal application+spraying treatment exhibiting the most effective selenium enrichment in oats.

Key words: Selenium fertilizer, Application method, Oats, Selenium enrichment effect