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Surrogate estimation of soil water retention characteristics of seasonally impounded soils

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Title Surrogate estimation of soil water retention characteristics of seasonally impounded soils
 
Creator N.G. Patil and G. S. Rajput
 
Subject Neural networks, Pedotransfer function, Soil water retention characteristics, VG function, Waterlogged soils
 
Description Not Available
Measurement of soil hydraulic properties is an arduous task, especially to meet the large scale data requirements. This has prompted numerous studies on surrogate estimation of hydraulic properties. Objective of this study was to build regional hydraulic database and develop pedotransfer functions (PTF) for estimation of water retention characteristics (WRC) of seasonally impounded shrink-swell soils. Soil samples from 41 soil profiles were analyzed in the laboratory for soil-water retention at nine pre-determined suction pressure points and basic soil properties. These data were used for calibrating neural PTFs to predict Van Genuchten (VG) function parameters for prediction of WRC from basic soil properties data. Routine method of deriving and relating retention function parameters to basic soil properties and Neuro-m method resulted in unacceptable PTFs (RMSE > 0.05 m3 m-3) . In place of parameters derived from SWRC, we used ‘Rosetta’ estimates of VG parameters to relate basic soil properties. Resultant hierarchical parametric PTFs with prediction accuracy of RMSE < 0.05m3 m-3 are presented. Successful calibration of PTFs using modified method indicates that no method is generic.
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Date 2020-08-25T05:30:41Z
2020-08-25T05:30:41Z
2014-06-30
 
Type Research Paper
 
Identifier N.G. Patil and G. S. Rajput (2014) Surrogate estimation of soil water retention characteristics of seasonally impounded soils. Indian Journal of Agricultural Research, 48 (6): 409-420.
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http://krishi.icar.gov.in/jspui/handle/123456789/40184
 
Language English
 
Relation Not Available;
 
Publisher AGRICULTURAL RESEARCH COMMUNICATION CENTRE