Hello Monika,

Your question is not completely clear qith me but with somewhat understanding, I think you are asking about what to do next after b tech in agricultural engineering. 

So here it is all. 

You can either pursue masters in Environmental engineering or some related branch. Later pursue some doctorate degree for the same for research and further study purpose.

Or you can go for the job. The job opportunities with them are as follows. 

• Researchers 
• Extension Specialists
• Waste Specialists
• Land Development Engr.
• Structure Designers
• Machinery Designers
• Electrification and Power Systems Designer
• Precision Agriculture Applications Engineer
• Environmental Controls Engineer

And many more are still available as scope. 

I think this might help you with your query.