Since 2003, the ICAR-CTCRI has been conducting studies on site-specific nutrient management of tropical tuber crops and as a part of it, soil samples were collected from major growing areas of India and were characterized for different physico-chemical parameters and the nutrients that are deficient in different zones were identified. Based on the results of the intensive research work conducted in these areas for the past 15 years, predominant nutrient deficiencies were identified for major growing areas. Based on the soil status, crop nutrient requirements (minimum and maximum accumulation) and recovery efficiencies calculated from different field trials conducted using the customized plant nutrient formulations developed and tested, the fertilizer micronutrient requirements were worked out following the principle of QUEFTS model and five different micronutrient formulations were developed. Micronutrient deficiencies are one of the reasons that limit tropical tuber crops production and often cause yield loss ranging from 20-80 percent. These deficiencies vary among soil types and the extent of yield losses also vary. Iron deficiency is a very serious problem in neutral to alkaline soils of Tamil Nadu whereas boron is severely deficient in acid soils of Kerala. Soil resource inventorisation, analysis of soil and plant samples, as well as SSNM studies over past 15 years across India, attempted to solve this problem. This innovation was aimed at solving the problem of micronutrient deficiencies in tropical tuber crops by developing nutrient formulations suitable for different situations. Data collected from soil inventorisation, analysis of soil and plant samples and SSNM field experiments and modeling studies were used to develop micronutrient foliar formulations for site-specific nutrient management of tropical tuber crops such as i. Cassava for acid soils (Zinc, Boron) ii. Cassava for neutral to alkaline soils (Iron, manganese, zinc, copper) iii. Elephant foot yam (Zn, B, Fe, Mn, Cu) iv. Yams (Zn, B, Mn, Fe, Cu) v. Sweet potato (Zn, B) Above five micronutrient formulations for different cultivation domains were formulated to reduce the deficiencies based on sound principles of crop nutrition.