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Three years of pot soil experiments showed that copper (Cu) could be toxic to rice root depending on its concentrations. Root development began to be inhibited at the soil Cu concentration of 100 mg kg-1. About half of root dry weights lost at the soil Cu concentration of 300 - 500 mg kg-1. Root growth nearly stopped at the soil Cu concentration of 800 - 1000 mg kg-1. There were interactions between...
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