陕西关中富硒土壤研究及开发利用——以三原—阎良地区为例
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Research, development and utilization of selenium-rich soil of Shaanxi:A case study of Sanyuan-Yanliang area
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图4 玉米、小麦硒含量与其根系土硒含量关系
Fig.4 The relation of selenium contents in corn and wheat grains with its contents in soils