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HEAVY METAL ACCUMULATION AND HEALTH RISK ASSESSMENT IN THE ROADSIDE SOIL-WHEAT SYSTEM ALONG ZHENGZHOU-KAIFENG HIGHWAY, CHINA Transferring model of Se in soil-wheat food chain and its application STUDY ON Se TRANSLOCATION IN SOIL-WHEAT SYSTEM USING 75Se Effect of timing of DCD application on nitrous oxide emission during wheat growing period Vertical distribution characteristics of heavy metals in agricultural soil profiles under rice-wheat system in Heigangkou Yellow River Irrigation Region