Agriculture is the science of arts and occupation of cultivating the soil, producing crops and rearing of animals to provide food, wool and other products. 

In the government organizations, a fresher can expect a salary between Rs 20,000/- to Rs 25,000/- per month depending on the efficiency and capability. In private organizations, MNC's and NGO's, an agriculture engineer is paid well. As for a lecturer in the filed of agricultural can earn an initial amount of Rs 15000/- per month plus other allowance.

If you want to go for agriculture engineering you have to appear for JEE Main exam. 

All the Best!!