Section 31(7) in The Bihar Civil Service (Executive Branch) and the Bihar Junior Civil Service (Recruitment) Rules, 1951
(7)Principles of crops production. - Crop rotations; crop mixtures ; seed selection ; multiplication and distribution of pure seeds; classification of crops and detailed study of the following crops :-Paddy, Maize, Wheat, Barley, Linseeds, Gram Arhar, Jute, Cotton, Sugarcane, Tobacoo, Jowar, Berseem, Soyabeen, Turmeric, Onions-Chillies, Potatoes, Sweet Potatoes.
