Abstract
The present study was conducted to study the variability in soil properties in relation to landforms, in the present investigation, two transects that is, Aravalli mountain ranges and Malwa plateau, were selected in the Pratapgarh district having eight landforms namely hill, pediments, valley, and plain in the Aravalli Mountain ranges and Malwa plateau, respectively. Total eight pedons were examined in the field and investigated in the laboratory using standard laboratory procedures. The soils on hill top and pediment were shallow, gravely sandy loam to clay loam single grain in texture with medium coarse weak sub angular blocky structure and exhibited dark yellowish brown to dark reddish brown colour. The soils of valley were deep, sandy loam to loam and silty clay loam to clay loam in texture with medium coarse weak sub angular blocky to medium fine moderate sub angular blocky structure and exhibited dark yellowish brown to dark reddish brown colour. The soils of plain were found deep, silty clay in texture with medium moderate to strong angular structure (angular and sub angular) and exhibited dark brown to very dark grayish brown colour. The available water capacity were recorded higher in the plain soils as compared to soils of other landforms as well as in Aravali mountain ranges and Malwa plateau. The pH was relatively higher in the soils of Aravali mountain ranges than Malwa plateau but EC was relatively lower in the soil of Aravali mountain ranges then Malwa plateau. Distribution of organic carbon was low in soils of all pedons but comparatively higher in soils of Malwa plateau. Base saturation was comparatively lower in the soils of lower topographic position. Cation exchange capacity was found positively correlated with clay and increases as clay increased down the slope as well as with depth. Concentration of exchangeable bases was in order of Ca2+>Mg2+>K+>Na+ in all the pedons soils. Key words: Toposequence associated soil, morphological, physical, chemical properties, taxonomy.
Highlights
Pratapgarh is newest constituted district of Rajasthan state, which is a tribal dominant with an area of 411736 ha
The pH was relatively higher in the soils of Aravali mountain ranges than Malwa plateau but Electrical conductivity (EC) was relatively lower in the soil of Aravali mountain ranges Malwa plateau
It is situated on the junction of Aravali mountain ranges and the Malwa Plateau; characteristics of both are prominent in the area
Summary
Pratapgarh is newest constituted district of Rajasthan state, which is a tribal dominant with an area of 411736 ha. North and southern part of the district having black cotton soil in abundance. In the traditional method of soil map compilation, much emphasis is not being given on study of variability in pedogenic factors and quantification of soil properties used for soil classification. As such the information, dealing with variability in genetic related soil properties and their relationship with properties, which have key role in natural resource management, is generally scanty in India and so in context to Rajasthan. Detailed studies on morphological, physical and chemical properties are required to comprehend the extent of soil variability and to optimizing land use in Pratapgarh district. The present investigation is taken up to study the pathways of soil formation in relation to topography
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