PINKI SETH* AND T. CHIKKARAMAPPA
Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Bengaluru-560 065
(Karnataka), India
*(e-mail : Pinkyseth0@gmail.com)
(Received : October 3, 2017; Accepted : December 15, 2017)
ABSTRACT
Soil nutrients are essential for crop growth. Spatial variability of nutrients can occur in various scales, between regions, between fields or within the field. RS and GIS techniques enable farm management based on small-scale spatial variability of soil and crop parameters in the field. The present study was carried out in Kumachahalli micro-watershed (Harve sub-watershed, Chamarajanagar taluk, Chamarajanagar district, Karnataka). The soil reaction in the study area was neutral to moderately alkaline (6.45 to 8.50). In valley lands, the soil reaction was neutral to slightly alkaline. The electrical conductivity f all the pedons was negligible (0.05 to 0.16 dS/m), which indicated non-saline nature of soils. The organic carbon content was medium in range (4.4 to 10.5 g/kg). The available nitrogen, phosphorus and potassium were low, low to medium and medium to high, respectively. Available sulphur content was medium to high in major part of the micro-watershed. Entire study area was sufficient in exchangeable calcium and magnesium. Micronutrients viz., copper, manganese, zinc and iron were sufficient, whereas boron was medium in major portion of the micro-watershed area.
Key words : Micro-watershed, RS and GIS techniques, valley lands