GIS-GPS based soil fertility maps of macronutrients of village Harnas of Bhor Tehsil in Pune District

Abstract

Investigation on GPS based soil fertility maps of Harnas Village of Bhor Tehsil of Pune District was undertaken with 120 geo-referenced (GPS) surface soil samples (0-22.5 cm depth) during the year 2017-2018 at Division of Soil Science and Agricultural Chemistry, College of Agriculture, Pune with the object to assess the soil chemical properties with available macro nutrients. The latitude and longitude of the sampling site were recorded with the handheld GPS instrument. It is observed that 97.5% soil samples belong to slightly acidic to acidic in reaction. However, the EC of soils ranged from 0.10 to 0.20 dSm-1 and soils are categorized as normal for emergence of seed. The organic carbon content of soil ranged from 0.21 to 0.71 per cent and categorized as low to high. The calcium carbonate content was medium to high and it ranged from 0.24 to 12.50 per cent.The available nitrogen, phosphorus and potassium ranged 75.26 to 175.60 kg ha-1 (mean 112.43 kg ha-1), 10.16 to 33.84 kg ha-1 (mean 21.11 kg ha-1) and 117.24 to 285.70 kg ha-1 (mean 212.97 kg ha-1), respectively. The available sulphur in soils ranged from 30.38 to 33.42 mg kg-1 (mean 31.91 mg kg-1). The pH of the soil has negative and non-significant correlation with available K and S. however it has positive with significant correlation with P with ‘r’ value 0.164.*. EC of the soils showed negatively but non-significant correlation with available P and S. But positively non-significant correlation with available N and K.Organic carbon showed negatively non-significant correlation with available K. here as it has positively non-significant correlation with available N, P and S. The CaCO3 was negatively and non-significantly correlated with available N, P and K. while it is positively and non-significantly correlated with available S. respectively. The spatial distribution maps of soil were developed with help of Arc GIS 10.2 software.