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Calibration and evaluation of pedotransfer functions to estimate available water capacity of seasonally impounded shrink-swell soils of central India

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Title Calibration and evaluation of pedotransfer functions to estimate available water capacity of seasonally impounded shrink-swell soils of central India
Not Available
 
Creator Nitin Gorakh Patil, Govind Singh Rajput , Rakesh Kumar Nema and Ran Bahadur Singh
 
Subject regressions, soil, water, moisture
 
Description Not Available
Pedotransfer functions (PTF) to estimate available water capacity of seasonally
impounded shrink-swell soils of central India are presented. Performance of the
calibrated PTFs is compared with that of ‘Rosetta’ a widely used general PTF.
Available information on soil properties contained nine point soil water retention
data for 175 samples measured at varied potentials, textural composition, bulk
density and organic carbon content. Nine widely used water retention functions
proposed by different researchers were fitted to the measured data and evaluated
for efficacy to describe water retention characteristics (WRC). Of the nine
functions evaluated, Brooks-Corey, van Genuchten, and Campbell functions were
recommended for describing WRC of these soils. We present point PTFs to
estimate available water capacity (AWC) using two approaches-regression and
artificial neural networks (ANN). Point estimation PTFs were calibrated for
water contents at 733 and 71500 kPa and consequently AWC. Performance
evaluation with root mean square error (RMSE) criteria suggested that ANN
based PTFs were better than regression PTFs. Performance evaluation of
‘Rosetta’ suggested its limited applicability for the study area. Region-specific
PTFs to predict AWC were recommended. Increasing the number of predictor
variables improved performance of neural PTFs and ‘Rosetta’.
Not Available
 
Date 2024-07-01T10:51:01Z
2024-07-01T10:51:01Z
2010-10-16
 
Type Research Paper
 
Identifier Nitin Gorakh Patil, Govind Singh Rajput , Rakesh Kumar Nema and Ran Bahadur Singh
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/83812
 
Language English
 
Relation Not Available;
 
Publisher Not Available