LAUSR

The study was conducted to assess the soil fertility status and to prepare the fertility mapping at Honnvalli micro-watershed of Hassan district during 2019 by using GIS and GPS techniques. The 105 grid soil samples were drawn from an area of 420 ha each at 400 m intervals and analysed for surface soil physicochemical and biological properties. The results revealed that overall Honnavalli micro-watershed found acidic pH area (93%), low organic carbon (55% area) and normal EC (100% area), further the watershed area was low in available N (51% area), P2O5 (77% area) and medium in K2O (48% area). The exchangeable Ca and Mg were sufficient in 95 and 72 per cent of the watershed area, respectively. The 95 per cent of the watershed area has sufficient available Sulphur. The surface soil fertility maps of pH, EC, OC, available nitrogen, phosphorus and potassium, exchangeable calcium and magnesium and available Sulphur were prepared through ArcGIS and thematic maps.