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Variation of some Soil Properties of Vertisols Developed in Different Agro-ecological Regions of India

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Title Variation of some Soil Properties of Vertisols Developed in Different Agro-ecological Regions of India
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Creator Gurav, Priya P., Ray, S.K. and Choudhari, Pushpajeet L.
 
Subject Variation, Soil Properties, Vertisols, Agro-ecological Regions, India
 
Description Not Available
Vertisols have the capacity to swell and shrink, inducing cracks and distinctive soil structure throughout the soil profile. The formation of these specific features is caused by a heavy texture, a dominance of swelling clay and marked changes in moisture content. In India they occur in various agro-ecological regions such as humid tropical (HT), sub-humid moist (SHM), sub-humid dry (SHD), semi-arid moist (SAM), semi-arid dry (SAD) and arid dry (AD) climatic environments and thus indicates an array of soils in a climosequence. In this study benchmark Vertisols, Panjari and Kheri are from sub-humid (moist) region, Teligi and Akola soils are from semi-arid (dry) and Nimone is from arid agro-ecological region. All the Vertisols are characterized by dark colour in surface soil, angular to sub-angular blocky structure, clayey texture, and slight to strong effervescence from upper to lower horizon of the soil profiles. These soils have high bulk density and high water retention capacity. The particle size distribution indicates all the soils are clayey with less amount of sand. In addition, they have deep wide-opened desiccation cracks at the surface which extend deep into the profiles and the depth of cracks increase with increase in aridity. The slickensides are found beginning at a shallower depth in arid climate, whereas they are observed at lower depths in wetter climates. Soils of all climates are dominated by Ca2+ ion in their exchange complex throughout the depth. However, in the sub-humid climate Mg2+ ions tends to dominate in the lower horizon. The semi-arid dry (Akola) soils have high Na+ ions in soil solution. This facilitated the translocation of Na-clay in the soil profile and is responsible for the increase in pH. Chemically the studied soils are slightly alkaline to alkaline in nature and poor in organic matter. The CEC varied from 40.8 to 50.18 cmol (p+) kh-1 in Panjari series profile which is highest followed by Teligi series profile. The calcium carbonate (CaCO3) shows gradual increase with depth in all the soil profiles, though it is preferentially accumulated in the sub-surface horizons of lower rainfall region soils. In climosequence the soils of the sub-humid region are generally Typic Haplusterts, soils of semi-arid region are Typic/Sodic/Calcic Haplusterts and soils of arid region are Sodic/ Calcic/ Aridic Haplusterts. The available potassium content (1 N NH4OAc extractable) of these soils is very high and available nitrogen is low. The potassium content in sub-humid moist (kheri) soil is high in surface horizon followed by semi-arid dry (Akola) soil. The ratio of exchangeable to non-exchangeable K varied from about 1:4 to 1:7. The variation is mainly due to mixing of different parent materials during the process of their formation.
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Date 2020-06-27T01:31:55Z
2020-06-27T01:31:55Z
2015-08-07
 
Type Presentation
 
Identifier Gurav, Priya P., Ray, S.K. and Choudhari, Pushpajeet L. (2015) Variation of some Soil Properties of Vertisols Developed in Different Agro-ecological Regions of India. Paper presented at the Nineteenth Annual Convention and National Conference on “Application of Clay Science in Agriculture, Environment and Industry”, Clay Minerals Society of India, New Delhi, 7-8 August, 2015, Kolkata, pp.36.
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http://krishi.icar.gov.in/jspui/handle/123456789/37493
 
Language English
 
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