Dear, agriculture Engineering is always in demand in a country like India where 70% population is dependent on agriculture and related works.So,the scope is very high.Secondly I want to say that only a few colleges are there which offer agriculture Engineering but as time is passing competition is increasing in agriculture Engineering so keep that in mind.After Btech. you can join banks,dairy, manufacturing plants etc.The scope is immense.Rest depends upon your interest and skills.Only join this Branch if you are interested otherwise go for other options available.
You can check this link for more details regarding colleges in Kerala. https://engineering.careers360.com/colleges/list-of-agricultural-engineering-colleges-in-kerala
Hope this helps.