eoi for purchase of different types of micronutrients in bulk on back to back payment basis eoi for purchase of different types of micronutrients in bulk on back to back payment basis , name of micronutrients , zinc sulphate ( heptahyderate ) zn-21% , ferrous sulphate ( fe-19% ) , copper sulphate ( cu-24% ) , manganese sulphate ( mn-30.5% ) , magnessium sulphate ( mg-9.6% ) , boron - 10.5% , boron - 20% , sulphur 90% ( granule ) , micronutrient grade -i ( for soil application ) , micronutrient grade - ii ( for foliar application ) , micronutrient grade - iii ( for foliar application-acid soil )