Section 12(5)(c) in The Assam Agricultural Service Rules, 1980
(c)for promotion to the cadre of Deputy Director, an officer must be at least a B.Sc. (Agriculture) or M.Sc. (Agriculture Bot.) and must have rendered service as Subject Matter Specialist [and/or] [Inserted by Notification No. AGA 107/75/Pt./370, dated the 4th July, 1980, w.e.f. 11-12-1080.] Sub-divisional Agricultural Officer for a minimum period of six year on the first January of the year of promotion;