不同硒形态和施硒方式对小麦硒吸收利用的影响及残效  

Effects of different forms and application methods of selenium fertilizers on wheat selenium uptake and utilization and its residual availability

作　　者：黄婷苗[1,2] 于荣 王朝辉[1] 黄冬琳[1] 王森[1] 靳静静[1] HUANG Ting-Miao;YU Rong;WANG Zhao-Hui;HUANG Dong-Lin;WANG Sen;JIN Jing-Jing(College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,Shaanxi,China;College of Agronomy,Shanxi Agricultural University,Taigu 030801,Shanxi,China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]山西农业大学农学院,山西太谷030801

出　　处：《作物学报》2022年第6期1516-1525,共10页Acta Agronomica Sinica

基　　金：国家现代农业产业技术体系建设专项(CARS-03);国家重点研发计划项目(2018YFD0200400);山西农业大学科技创新基金项目(2020BQ72)资助。

摘　　要：为了确定改善小麦硒营养的硒肥调控措施,分析不同施硒方法对小麦硒农艺强化的可行性,在陕西永寿典型缺硒土壤上开展2年定位试验。第1年,以生产硒含量100μg kg^(-1)的小麦籽粒为最低目标,设置不施硒、土施硒酸钠、叶喷硒酸钠、土施亚硒酸钠、叶喷亚硒酸钠5个处理,用量分别为0、15、18、700、45 g Se hm^(-2),研究不同硒价态和施硒方式对小麦产量、硒含量、硒吸收利用的影响,第2年各小区一分为二,一半秸秆移出,一半秸秆还田,不再施硒,研究硒肥残效。结果表明,不同硒价态和施硒方式对小麦籽粒产量、秸秆生物量无影响。第1年,各施硒处理的籽粒硒含量均达到预期目标,介于109~397μg kg^(-1),面粉硒含量介于101~356μg kg^(-1)。第2年,仅土施亚硒酸钠的籽粒、面粉硒含量高于100μg kg^(-1),秸秆还田和不还田间无差异。土施、叶喷硒酸钠和土施、叶喷亚硒酸钠的籽粒硒强化指数分别为4.7、16、0.3、8.0(μg kg^(-1))(g hm^(-2))^(-1)。叶喷硒酸钠的硒肥当季利用率最高,为7.3%;土施亚硒酸钠的硒肥累计利用率仅0.3%,但后效长,第2季小麦收获后,土壤有效硒含量最高,秸秆不还田和还田条件下分别为91μg kg^(-1)和107μg kg^(-1)。综上所述,黄土高原缺硒区,土施、叶喷一定量的硒酸钠或亚硒酸钠,均有利于目标硒营养的小麦生产,土施亚硒酸钠的需用量大,生产中应关注其后效,选择适宜的施硒方式和用量,实现小麦硒强化。A two-year positioning field experiment was conducted to determine the reasonable regulation measures of selenium(Se) fertilizer for improving wheat grain Se nutrition,and to explore the feasibilities of different Se application approaches in Se agronomic biofortification of wheat grown in the typical Se-deficient soils of Yongshou County,Shaanxi Province.To study the effects of different forms and application methods of Se fertilizers on wheat yield,Se concentration and its accumulation and utilization,with the goal of producing wheat grain with Se concentration of 100μg kg^(-1),five Se application rates of 0,15,18,700,and 45 g hm^(-2) were calculated for the treatments of no Se application (control),soil-and foliar-sodium selenate,and soil-and foliar-sodium selenite in the first year,respectively.In the following wheat season,for further investigating the residual Se availability,no Se fertilizer was applied and each plot was divided into straw removal and straw return.These results showed that the wheat grain yield and straw biomass were not influenced by Se forms and application methods.For the first wheat season,grain Se concentration reached the expected target value with a range of 109–397μg kg^(-1),and the flour Se concentration varied from101μg kg^(-1) to 356μg kg^(-1) for all the Se application treatments.In the next year,both grain and white flour Se concentrations were 100μg kg^(-1) higher than under the treatment of soil-sodium selenite,and there was no significant difference of straw removal and straw return.Grain Se biofortification index was 4.7,16,0.3,8.0 (μg kg^(-1))(g hm^(-2))^(-1) for soil-and foliar-sodium selenate,and soil-and foliar-sodium selenite,respectively.The Se use efficiency was the highest for foliar-sodium selenate (7.3%),whereas its cumulative use efficiency was only 0.3%in soil-sodium selenite treatment with the long-term residue effects.At wheat harvest,the highest soil available Se was observed for soil-sodium selenite,with 91μg kg^(-1)and 107μg kg^(-1) for the straw

关 键 词：硒酸钠 亚硒酸钠 土施 叶喷 硒肥利用率 硒残效 

分 类 号：S512.1[农业科学—作物学]