I want to know the permissible limits of heavy metals in rice plants.
Permissible for what??? Growth or consumption by humans?
C.A. (Kees) Kan for plant growth and toxicity. i.e at what concentration it would be toxic for plants.
Check the FAO site or other comparable data bases on the internet.
Look up litterature by Prof. Jan Vymazal in the library.
The permissible limits of heavy metals varies from plants to plants according to the plant species and the environmental conditions , therefor , you can find the permissible limits for rice plant from FAO or from literature review .
with best wishes
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