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Managing waterlogging and soil salinity with a permanent raised bedand furrow system in coastal lowlands of humid tropics

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Title Managing waterlogging and soil salinity with a permanent raised bedand furrow system in coastal lowlands of humid tropics
Not Available
 
Creator A. Velmurugana, T.P. Swarnam, S.K. Ambast, Navneet Kumar
 
Subject Coastal salinity , Waterlogging, Land shaping , Salt dynamics, Andaman Islands
 
Description Not Available
Soil and water salinity, waterlogging, and a lack of good quality irrigation water are the principal con-straints affecting the productivity of the coastal areas in the humid tropical region. The present studywas conducted at four sites in the coastal lowlands of the Andaman Islands to assess the impact of apermanent raised bed and furrow (RBF) system on waterlogging and salinity. The RBF system improvedthe drainage of the raised beds, maintained a favorable soil moisture content, harvested rain water to amaximum depth of 120 cm, and prevented the entry of tidal and runoff water into the furrow. Betweenthe years 2009 and 2014, the soil salinity in the raised beds was reduced by 85% from the initial level of10.9 dS m−1during three distinct phases namely, the lag phase, the leaching phase and the equilibriumphase which were recognized based on their rate of reduction of salinity Similarly significant reduc-tions were observed in seasonal variations and in the vertical salinity gradient. Interannual variationsin salinity closely followed the rainfall pattern, particularly during the dry period. The data showedsignificant reduction in the concentration of soluble ions (e.g., Na+, Ca2++ Mg2+, Cl−and SO42−). In addi-tion, over the years the salinity and sodium toxicity in the furrow water decreased and became suitablefor irrigation and fish culture. In contrast, the coastal lowlands adjoining the RBF system experiencedwaterlogging (5–81 cm) and high levels of salinity (3.0–9.1 dS m−1), which closely corresponded with therainfall patterns. Multiple linear regression models were developed to predict the surface soil salinity ofthe RBF system separately for the monsoon (r2= 0.56) and dry seasons (r2= 0.63). Waterlogging and salin-ity peaks in different seasons require a different management strategy, but the RBF system was effectivein addressing this challenge together. The findings from this study would equally apply to other humidtropical coastal regions, provided that considerations are given to the inherent soil properties and thelocal hydrology.
 
Date 2021-01-23T05:00:08Z
2021-01-23T05:00:08Z
2016-01-01
 
Type Research Paper
 
Identifier A. Velmurugana, T.P. Swarnam, S.K. Ambast, Navneet Kumar , www.elsevier.com/locat e/agwat
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http://krishi.icar.gov.in/jspui/handle/123456789/44981
 
Language English
 
Relation Not Available;
 
Publisher Elsevier B.V