Hello Kavita,
After B.Tech in Civil Engineering you are eligible for both M.Tech in agricultural engineering and M.Tech in environmental engineering. The only way to compare the two is with the job prospects they offer.
The average salary offered for an agricultural engineering with masters is - 1.5LPA to 3 LPA
And the jobs that will be offered - Research scientist, Agronomist, Breeder etc.
For an environmental engineer with masters
Average salary - 4 to 6 LPA
And the jobs - Research Assistant, Assistant Professor, Environmental Specialist, Technical Test Engineer, Bio Research Assistant, Project Assistant/Associate, Health & Safety Administrator, Environmental Engineer, Environmental Officer etc.
Hope this helps and Good luck
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