Plant nitrogen and phosphorus utilization under invasive
May 16 2018 After strictly washing leaf samples were oven dried at 60 C until a constant weight was achieved and then ground to fine powder using a ball mill MM200 Retsch Haan Germany in preparation for analysis of N and P concentrations and δ 15 N. Fresh soil samples were passed through a 2 mm mesh sieve to remove impurities and coarse fragments
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