I will tell you the books names for Agriculture subject which come under Indian Forest Service so that you can have idea.

Here I have some names of the books

Soil Science - D.K Das Or Brady

Agronomy By Yellamananda Reddy

Plant Breeding By B.D. Singh

Genetics By B.D.Singh

Physiology By Pandey & Singha

Indroduction To Horticulture - Kumar

Handbook Of Agriculture By ICAR

Agricultural Extension Education in India Pathology - Singh

Entomology - Vasantha Raj & David Entomology - Nitish Shekhar

The Hindu - Survey Of Indian Agriculture Agriculture Statistics

Special Issue of Agriculture by The Hindu