Soil Spatial Variability Assessment for site specific Nutrient Management in sugarcane: A case study from Karnataka, India presented by Dr. V. C. Patil(Director,KIAAR)

The presentation is about assessing of soil macronutrients (i.e., nitrogen, phosphorus, and potassium) for site-specific crop management (SSCM) and enhancing agricultural production. Geospatial technology has been utilized to assess the impact of soil properties on sugarcane productivity and optimize the decision making management for site-specific fertilization and precision farming. Kriging technique is used on 643 geo-referenced point soil samples during 2014-15 to interpolate lab analyzed macro nutrient such as pH, Electrical conductivity (EC), and soil available nutrients (N, P2O5, K2O). Spatial variability was quantified through Semi-variogram analysis using Geostatistics. Kriged maps were generated in Geographic Information System (GIS) using best fit exponential model. Sentinel-2 imageries are utilized for correlation between soil physical properties and the vegetation indices such as NDVI, NDWI, GNDVI, NDRE and EVI to develop prescription maps for variable rate application of fertilizers and soil amendments.