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

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Title Managing waterlogging and soil salinity with a permanent raised bed and furrow system in coastal lowlands of humid tropics
Not Available
 
Creator Velmurugan, A., Swarnam, T.P., Ambast, S.K. and Kumar, Navneet
 
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 constraints
affecting the productivity of the coastal areas in the humid tropical region. The present study
was conducted at four sites in the coastal lowlands of the Andaman Islands to assess the impact of a
permanent raised bed and furrow (RBF) system on waterlogging and salinity. The RBF system improved
the drainage of the raised beds, maintained a favorable soil moisture content, harvested rain water to a
maximum depth of 120 cm, and prevented the entry of tidal and runoff water into the furrow. Between
the years 2009 and 2014, the soil salinity in the raised beds was reduced by 85% from the initial level of
10.9 dS m−1 during three distinct phases namely, the lag phase, the leaching phase and the equilibrium
phase which were recognized based on their rate of reduction of salinity Similarly significant reductions
were observed in seasonal variations and in the vertical salinity gradient. Interannual variations
in salinity closely followed the rainfall pattern, particularly during the dry period. The data showed
significant reduction in the concentration of soluble ions (e.g., Na+, Ca2+ + Mg2+, Cl− and SO4
2−). In addition,
over the years the salinity and sodium toxicity in the furrow water decreased and became suitable
for irrigation and fish culture. In contrast, the coastal lowlands adjoining the RBF system experienced
waterlogging (5–81 cm) and high levels of salinity (3.0–9.1 dS m−1), which closely corresponded with the
rainfall patterns. Multiple linear regression models were developed to predict the surface soil salinity of
the RBF system separately for the monsoon (r2 = 0.56) and dry seasons (r2 = 0.63). Waterlogging and salinity
peaks in different seasons require a different management strategy, but the RBF system was effective
in addressing this challenge together. The findings from this study would equally apply to other humid
tropical coastal regions, provided that considerations are given to the inherent soil properties and the
local hydrology.
Not Available
 
Date 2018-11-27T08:25:09Z
2018-11-27T08:25:09Z
2016-04
 
Type Research Paper
 
Identifier Velmurugan, A., Swarnam, T.P., Ambast, S.K. and Kumar, Navneet 2016. Managing waterlogging and soil salinity with a permanent raised bed and furrow system in coastal lowlands of humid tropics. Agricultural Water Management, 168: 56-67
0378-3774
http://krishi.icar.gov.in/jspui/handle/123456789/13598
 
Language English
 
Relation Not Available;
 
Publisher Elsevier