hello Sir,
There are no special rates for greenhouse cultivated produce. The only advantage is the quality may be better and thus will fetch u a higher price. You should have analysed the market before cultivation. Now that you already have the produce, please approach SAFAL, or any retail stores for a better price than the mandi.
If you still have not started cultivation, please have a market analysis of the crop, or you can even check for export which may fetch you higher returns.
REgards
Ashwini S