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Effects of Shallow Saline Groundwater Table Depth and Evaporative Flux on Soil Salinity Dynamics using Hydrus-1D

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Title Effects of Shallow Saline Groundwater Table Depth and Evaporative Flux on Soil Salinity Dynamics using Hydrus-1D
Not Available
 
Creator Bhaskar Narjary
Satyendra Kumar
Murli Dhar Meena
S. K. Kamra
D. K. Sharma
 
Subject Soil salinity
Shallow saline groundwater
Hydrus 1-D
Evaporative flux
Nain Farm CSSRI
 
Description Not Available
Soil salinization is a major environmental problem and critical concern in arid and semiarid regions. Hydrus-1D
model was used to simulate effects of shallow saline groundwater table depth and evaporative flux on soil salinity
movement in a saline environment. After successful calibration and validation with recorded soil moisture and soil salinity
data, the model was used to evaluate two hypothetical scenarios for managing soil salinity, i.e., with 5 groundwater
table depths (WTD) (WTD as on 2015, 25% and 50% rise; 25% and 50% decline in WTD based on the 2015 reference
depth) and 3 different evaporative flux conditions (25, 50 and 75% reduction in evaporative flux). The model was
calibrated, validated and run for scenarios with 2015 weather and WTD condition for the periods of 288 days. During
calibration periods, root mean square error (RMSE) value of soil moisture content was 0.023 cm3 cm-3 and for soil salinity
was 2.58 dS m-1, while during validation period RMSE of 0.023 cm3 cm-3 and 1.5 dS m-1, respectively, was recorded for
soil moisture and soil salinity. Simulation results indicated that summer season (March to May, 60–150 Julian days) is the
most important time to control soil salinity in this region. Considerable upward salt movement occurred during this period
with 25 and 50% rise in groundwater table depth. Average root zone soil salinity increased by 6 and 12 dS m-1 when WTD
raised by 25 and 50%, respectively, but negligible change in soil salinity was observed when groundwater table declined by
25 and 50%. The effective way to control this upward salt movement was reducing evaporative demands. Simulation study
indicated that reducing evaporative flux of 25, 50 and 75% reduced profile soil salinity by 3.53, 6.95 and 12.38 dS m-1,
respectively, during peak summer period.
Not Available
 
Date 2020-12-28T10:15:45Z
2020-12-28T10:15:45Z
2020-11-05
 
Type Research Paper
 
Identifier Narjary, B., Kumar, S., Meena, M.D., Kamra, S.K., and Sharma, D.K., 2020. Effects of Shallow Saline Groundwater Table Depth and Evaporative Flux on Soil Salinity Dynamics using Hydrus-1D. Agricultural Research. https://doi.org/10.1007/s40003-020-00484-1
https://doi.org/10.1007/s40003-020-00484-1
http://krishi.icar.gov.in/jspui/handle/123456789/44146
 
Language English
 
Relation Not Available;
 
Publisher Springer nature