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University of Horticultural Sciences, Bagalkot (2018)

CHARACTERIZATION OF BLACK SOILS UNDER RAMTHAL MICRO IRRIGATION PROJECT FOR SALINITY PARAMETERS

LAKSHMI P. D.,

Titre : CHARACTERIZATION OF BLACK SOILS UNDER RAMTHAL MICRO IRRIGATION PROJECT FOR SALINITY PARAMETERS

Auteur : LAKSHMI P. D.,

Université de soutenance : University of Horticultural Sciences, Bagalkot

Grade : Master of Science (MS) 2018

Résumé
Topography is one of the important soil forming factor having great influence on the movement of water and salts along with it. Considering its importance, an extensive soil survey was carried out to assess the soil salinity parameters and distribution of cations and anions along the gradient in a block of Ramthal Micro Irrigation Project, Hungund, representing typical black soils. Representative profile samples at different elevations were also studied. The samples were grouped into three categories namely, high elevation (L1 : >526 m), mid elevation (L2 : 516-526 m) and low elevation (L3 : <516 m) areas. The soil pH ranged from moderate to high alkalinity and it varied significantly with elevations in the order of high > mid >low elevations. The electrical conductivity ranged from 0.10 to 0.36 dSm-1. The soils at higher elevation (L1) recorded significantly higher EC values compared to mid (L2) and low (L3) elevations. In terms of cations, the soils existing at mid elevation (L2) recorded significantly higher amounts of calcium and magnesium compared to soils of high elevation areas. Contrastingly, potassium contents was found high in low elevation (L3) areas. However, the sodium was found significantly high in higher elevations (L1). The concentration of cations varied in the order of Na+> Ca2+> Mg2+> K+. The total carbonates and bicarbonates was significantly lower in low elevation areas (L3) compared to high and mid elevations (L1 and L2) areas. Contrastingly, the chloride was maximum in high elevation (L1) areas compared to mid and low elevations (L2 and L3). However, the sulphate was found significantly higher in high elevation areas.

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