Delineation of spatial variability in soil fertility is of critical importance to identify specific constraints of a particular site and for effective nutrient management. A geo tagged soil survey was conducted in Kanthipara village of Udumbanchola thaluk in Idukki district, Kerala. Kanthipara village lies between the geographic coordinates 77o 6’ 24’’ to 77o11’ 28" East longitudes and 9o54’ 59" to 9o57’ 26" North latitudes. In order to obtain uniform spatial distribution of soil samples, cross-checking of soil sample locations was done in GIS, and adequate soil samples were collected again from village for sufficient representation. Results of soil nutrient data with GPS coordinates of cardamom soil samples were imported to Arc GIS software as shape file format for spatial interpolation of soil nutrients. Spatial interpolation maps were prepared for 12 nutrients like organic carbon (OC), Soil pH, available potassium (K), available calcium (Ca), available magnesium (Mg), available boron (B), available copper (Cu), available iron (Fe), available manganese (Mn), available phosphorous (P), available sulphur (S) and available zinc (Zn). Further, village-wise spatial variability of soil nutrient maps were prepared in the Geotiff format with cell size of 30m. The online fertilizer recommendations (mobile and web) were developed based on interpolated soil fertility data by overlaying different soil fertility parameters and soil depth following the fertilizer recommendation guidelines of ICRI. The status of organic carbon, available phosphorus and available potassium were high to very high in 93.56 %, 87.10% and 84.69 % cardamom soils respectively of Kanthipara village. The study also highlighted the emergence of secondary and micro nutrient deficiencies to the tune of 28.23% for magnesium, 57.25 % for sulphur and 64.52 % for boron in the soil. The 63.1% of soils were detected with the problem of soil acidification which necessitates amelioration measures. The study points to the scope of skipping phosphatic fertilisers and reducing the dose of nitrogen and potassium fertilizers in the range of 25 -30 % in Kanthipara village and at the same time correcting secondary as well as micronutrient deficiencies like sulphur and boron for improving productivity. The cardamom farmers of Kanthipara village will now be able to access the site-specific fertilizer recommendation of their cardamom plantations with the help of ‘CardS App’, the mobile App developed by ICRI. The use of ‘CardS App’ will greatly enable cardamom farmers to have savings on fertilizer applications and correction of soil nutrient constraints to improve productivity as well as farm income.