The northeastern state was declared the first organic state of the country by Prime Minister Narendra Modi in 2016 at an event in Gangtok.
"I asked the prime minister to provide us two times the sum of fertiliser subsidy given up by Sikkim. But he did not say anything about it," Chamling said here.
Bihar and other northeastern states have sought the help of Sikkim in adopting organic farming, he said.
The chief minister was recently conferred with the One World Grand Prix Award for his achievements in converting Sikkim into an organic state.