Effective Rate of Duty: agricultural grade zinc sulphate used as a micronutrient now attracts nil duty under amended notification. The Government amends Notification No. 4/2006-Central Excise by inserting S.No. 51A to list tariff heading 2833 29 for agricultural grade zinc sulphate ordinarily used as a micronutrient, specifying an effective rate of duty of Nil under Notification No. 36/2007-Central Excise dated 9 October 2007.