চুপাৰ ন’ভাচুপাৰি
চুপাৰফচফেট (Assamese)
Contributed by: Mousumi Konwar on 2023-11-20
চুপাৰফচফেট (Assamese)
Contributed by: Mousumi Konwar on 2023-11-20
1. Superphosphate is a chemical fertiliser first synthesised in the 1840s by reacting bones with sulfuric acid. The process was subsequently improved by reacting phosphate coprolites with sulfuric acid. Subsequently... from wikipedia.org