Why don’t you have your own research on it?
Neither is there a standard solution nor do I know anything about your study area, your data or your aims. You can’t expect step-by-step solutions for whole applications.
Please use the search function, there are so many topics in here which discuss how it could be done:
sorry, you can’t just ask for a whole analysis.
Please check the tutorials for pre-processing which show you how to deal with S1 GRDH data.
Then have a look at some studies to get an idea of what different approaches in agriculture exist.
Search in this forum, there are lots of great examples:
Radar remote sensing isn’t something you can master over night and just apply by following a recipe. Read some stuff, develop ideas, discuss problems in here - you are free to make your own mind.
Here are some great documents / tutorials if you are new to SAR remote sensing:
Introduction to SAR remote sensing
A tutorial on synthetic aperture radar
Forest Monitoring with multi-temporal SAR data
Agricultural Applications with SAR Data
Guidelines for SAR interferometry
If you have problems at specific steps of processing - feel free to ask. But you will have to come up with own approaches.