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Calcereous and subsoil sodicity in ferruginous Alfisols in southern India: an evidence of climate shift

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Title Calcereous and subsoil sodicity in ferruginous Alfisols in southern India: an evidence of climate shift
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Creator Chandran, P., Ray, S.K., Bhattacharyya, T., Tiwari, P., Sarkar, D., Pal, D.K., Mandal, C., Nimkar, A.M., Raja, P., Maurya, U.K., Anantwar, S.G., Karthikeyan, K. and Dongare, V.T.
 
Subject Calcereous, subsoil, sodicity, ferruginous Alfisols, southern India, climate shift
 
Description Not Available
We report alkaline, sodic and smectitic ferruginous Alfisols from semi-arid part of
southern India. Such Alfisols on micro-low (ML) position in a catena are spatially associated
with non-sodic soil at micro-high (MH) positions. The soils of the MH are well drained, sandy
clay loam to sandy clay in texture, acidic to slightly alkaline with less CaCO3 and non-sodic.
However, soils on ML is clayey, alkaline (9.1 – 9.4) and calcareous (10-13%) with high available
water content and high sodicity (ESP 16-41%). The saturated hydraulic conductivity (sHC)
of the ML soils is almost nil in the sub-surface horizons due to high ESP resulting in dispersion
of clay and clogging of soil pores. Mineralogical studies indicate the presence of smectitekaolinite
(Sm-K) interstratified mineral, which was formed during the past humid tropical climate,
where as the formation of the high charge smectite occurred during the prevailing semiarid
climate in both MH and ML soils. Sm-K is dominant in MH soils whereas smectite is
dominant in ML soils. Micro- topography of the study area indicates that the ML positions are
repeatedly flooded with surface water during brief and high-intensity showers, which provided
steady supply of alkalis by hydrolysis of feldspars at MH sites leading to precipitation of calcium
carbonate at high pH, development of subsoil sodicity and persistence of Sm-K and smectite
in ML sites. Due to formation CaCO3 and concomitant development of sub-soil sodicity, the
sHC of the ML soils were impaired. Similar micro-topographical situation in the formation of
sodic and non-sodic soils on ML and MH positions respectively was reported earlier in soils of
the Indo-Gangetic Plains (IGP), but in swell-shrink soils of central India a reverse situation
was observed. The present study, however, indicates the need of a detailed study to explain the
development of sodicity in soils of red and black soil associations in tropical India. Earlier
studies by NBSS&LUP (ICAR) demonstrated that the formation of sodic soils is the result of
climate shift from humid to semi-arid climate during the Holocene period. The study reaffirms
the need of precise understanding of pedogenic processes for pragmatic land resource inventory
even at larger scales for proper management of soil resources
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Date 2020-05-31T13:37:29Z
2020-05-31T13:37:29Z
2013-01-31
 
Type Research Paper
 
Identifier Chandran, P., Ray, S.K., Bhattacharyya, T., Tiwari, P., Sarkar, D., Pal, D.K., Mandal, C., Nimkar, A.M., Raja, P., Maurya, U.K., Anantwar, S.G., Karthikeyan, K. and Dongare, V.T. (2013). Calcereous and subsoil sodicity in ferruginous Alfisols in southern India: an evidence of climate shift. Clay Research, 32: 114-126
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http://krishi.icar.gov.in/jspui/handle/123456789/36676
 
Language English
 
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Publisher Not Available