1. agriculturist is a person who cultivates land personally [definition given in Maharashtra Tenancy and Agricultural Lands Act, 1948
2. if an agricultural land is to be sold to a person for non-agricultural purpose, then formerly the Collector's permission was required for the sale
3. later on by an amendment which came into effect from 1.1.16, the above restriction of taking prior approval of Collector was removed if the agricultural land is situated in specified territories like within Municipal Corporation or Municipal Council limits, etc
4. however the above restriction applied when an agricultural land was sought to be sold to a person for NA use. The restriction has been removed by an amendment but subject to certain conditions
5. in your case it is not that your wife desires to buy agricultural land for any NA use.
6. so there is no embargo against her from buying an agricultural land provided she buys such land within the ceiling limits given in the Maharashtra Agricultural lands (ceilings on holdings) act, 1961
7 your wife after purchase will then need to apply for a farmer's certificate (Bhoomi Praman Patra)