Micronutrient status of salt affected soils of Siruguppa taluk in TBP irrigation command area

Abstract

A study was conducted to assess available micro-nutrient (Fe, Mn, Cu and Zn) status and their relationship with soil properties of Siruguppa taluk in Bellary district by the aid of GPS and toposheet (1:50000 scale). A total of 78 soil samples (0-15 and 15-30 cm) collected during summer 2017 on a grid basis (5’ x 5’) from 20 grids (39 sampling points) were analysed for micro-nutrient status and mapped by geographic information system (GIS) technique. Majority of samples had DTPA-Zn (53.85 to 97.43%) in low category (< 1 ppm) and Cu (66.67 to 97.43%) in medium category (0.5 to 2.5 ppm) at surface and subsurface soils respectively. The maximum per cent of surface samples had DTPA-Fe (61.54) and Mn (89.74) in medium category while 74.36 and 56.41% of subsurface samples were in low category respectively. In general, DTPA extractable Zn, Fe, Mn and Cu had negative correlation with soil pH and positive correlation with organic carbon.