The Agriculture Department has directed its field staff to draw samples of vermin-compost and various types of bio-fertilisers to ensure that farmers were supplied products of the prescribed standard. Director of agriculture J.C. Rana said the fertiliser (control) order had been amended to include azotobacter, rhizobium, azospirillium and phosphate solublising bacteria under bio-fertilisers and town compost, vermi-compost and press mud under organic fertilisers.