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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
 
Creator Nitin Gorakh Patil , Govind Singh Rajput , Rakesh Kumar Nema & 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’.
 
Date 2020-06-30T16:12:49Z
2020-06-30T16:12:49Z
2009-11-05
 
Type Research Paper
 
Identifier Patil N. G., Rajput G.S., Nema, R. K., and Singh, R. B. (2010) Calibration and evaluation of pedotransfer functions to estimate available water capacity of seasonally impounded shrink-swell soils of central India, Archives of Agronomy and Soil Science, 56:5, 525-538, DOI: 10.1080/03650340903161187
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http://krishi.icar.gov.in/jspui/handle/123456789/37802
 
Language English
 
Relation Not Available;
 
Publisher Taylor & Francis