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Pot soil experiments showed that copper (Cu) is highly toxic to rice. Rice grain yields decreased exponentially and significantly with the increase of soil Cu levels. Rice grain yield was reduced about 10% by soil Cu level of 100mgkg −1 , about 50% by soil Cu level of 300–500mgkg −1 and about 90% by soil Cu concentration of 1000mgkg −1 . Root was more sensitive to soil Cu toxicity...
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