Well, though I am not sure about their performance and reliability, I would suggest a few apps that came into my view -
Developed by GreenTech solutions, this app helps you take informed decisions about the yields. It helps you in getting location based weather updates, agro news and contact information for the nearest fertiliser dealers.
This app is available in Hindi, Gujarati and English. There are plans to add some more Indian languages. It offers up to date climate conditions and price updates in addition to the agriculture related news and information.