U can use gis to determine productivity, climate and soil factors. I dont know what rs means. You need to express what ur project is about so your objective becomes ur determining factor whether u will use gis or rs or a combination of both.

Based upon your previous responses you can use remote sensing and gis. Your study is not very clear on precisely what you wish to be your focal objective. The landsat data available from 1972 can be used for satellite imagery. Your time period of 30 yrs or 35 would be based upon available data and using sentinel data for specific time periods to identify areas of concern. In the final analysis all data collected can design a climate change/agricultural productivity model that can be used for other areas of interest. This is my opinion.

okay Reishma mam Thank you, can I show in my study NDVI year wise or 5 year gap to show in terms of agriculture?

which one would reflect the type of comparison you are looking for?

due to temperature or (climate variation)

Your comparison should go yearly then if u have all datasets perhaps u can also use ndvi against all parameters too. That should be interesting.

Thank you maam