Fertility assessment of soils of Nandipura micro-watershed under Chikkamagalur district, Karnataka

Abstract

An assessment on fertility status was carried out on the soils of Nandipura micro-watershed during the year 2018-2019. Forty-eight grid samples were collected and analysed for its fertility status and were mapped using ArcGIS software. The mapping of fertility status of soils of Nandipura micro-watershed revealed that the soils were low (86.52% of the micro-watershed area) to medium (8.57%) in available nitrogen content, low (44.02%) to medium (51.07%) in available phosphorus, low (15.20%) to medium (79.89%) in available potassium, medium (21.56%) to high (73.52%) in available sulphur, exchangeable calcium and magnesium content were sufficient in entire micro-watershed area. DTPA extractable zinc was deficient in 105 ha and sufficient in 370 ha area whereas, DTPA extractable iron, copper and manganese were sufficient throughout the study area. Available boron was low (34.38%) to medium (60.25%).

Soil Fertility Mapping Using GIS in Sirur Sub-Watershed of Kundagol Taluk of Dharwad District, Karnataka, India

“…Like sulphur status, available boron status is also closely followed by organic carbon status in these soils [43]. A similar result was reported by Gurumurthy et al [44] and Katti et al [40].…”

“…Satyavathi and Suryanarayana Reddy [39] similarly noted that zinc content decreases as soil pH increases. Given that most soils are alkaline, low in OC and rich in CaCO3, zinc may have precipitated as hydroxides and carbonates, leading to reduced solubility and mobility, thereby decreasing its availability [36,40].…”

Assessment of micronutrient status of some soils of Tengakhat block of Dibrugarh district, Assam, India

“…Similar result was found by Riyabati and Sarangthem (2017) [40] ; Khadka et al, (2017) [22] , Vijaya et al (2000) [51] . Higher available manganese may be present in the study site soil due to granite gneiss parent material (Gurumurthy et al, 2019 [17] , Katti et al, 2020) [21] .…”

“…This is supported by the findings of Medhe et al, (2012) [32] . Presence of primary and secondary iron minerals like hematite, olivine, siderite, goethite, magnetite etc., (Das, 2000) [12] and granite gneiss parent material (Katti et al, 2020) [21] might be the reason of high availability of iron.…”