Hi Sonia, you can refer my earlier answer on a similar question. Agricultural lands can be a good investment option, but you need to check if you are eligible to buy (in some cases, only people with agricultural background can buy agricultural plots). Some developers sell plots which will later become part of PCMC (and hence will automatically become NA). We bought one such plot so we are aware of the process.
So, to answer your question, please get all correct details of the plot (from someone who knows laws related to the land), check at the local Talathi office if possible and only then make the purchase.