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Prediction of root zone water and nitrogen balance in an irrigated rice field using a simulation model

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Title Prediction of root zone water and nitrogen balance in an irrigated rice field using a simulation model
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Creator Ch. Jyotiprava Dash
A. Sarangi
D. K. Singh
A. K. Singh
Partha Pratim Adhikary
 
Subject _ Nitrate leaching _ Groundwater _ HYDRUS-1D _ Fertilizer use scenario
 
Description Not Available
In irrigated semi-arid regions, knowledge of
groundwater recharge and nitrate leaching is essential for
sustainable management of water resources. In this study,
the potential recharge and nitrate leaching below the root
zone of rice crop were estimated using a root zone modelling
approach through simulation with HYDRUS-1D
model. The field data collected for a single season were
used for calibrating the model and validated for the next
season. The simulated results, when compared with the
measured soil water and nitrate contents at different soil
depths showed good agreement between the HYDRUS-1D
simulation and field data. The validated results indicated
that 55.5 % of the applied water percolated below the root
zone. Nitrogen balance within 120 cm deep soil profile
indicated that volatilization, denitrification, plant uptake
and leaching losses were 24.0, 18.9, 109.0 and
28.5 kg N ha-1, respectively. The magnitude of nitrate
leaching was 23.7 % of added fertilizer. Different nitrate
leaching scenarios were generated using different fertilizer
application rates exceeding the optimal dose. These scenarios
showed an increasing trend with increase of
fertilizer rates, fitted with a second-order polynomial
equation (R2 = 0.99). The equation can be used for estimation
of nitrate leaching below root zone under different
fertilizer input scenarios of rice grown in similar hydroagro-
climatic regions.
Not Available
 
Date 2020-05-08T10:47:50Z
2020-05-08T10:47:50Z
2014-04-15
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/35474
 
Language English
 
Relation Not Available;
 
Publisher Not Available