Abstract
Study of soil properties like field capacity (F.C) and permanent wilting point (P.W.P) plays important roles in study of soil moisture retention curve. Pedotransfer functions (PTFs) provide an alternative by estimating soil parameters from more readily available soil data. In this study, a new approach is proposed as a modification to a standard fuzzy modeling method based on the table look-up scheme. 70 soil samples were collected from different horizons of 15 soil profiles located in the Ziaran region, Qazvin province, Iran. Then, fuzzy table look-up scheme was employed to develop pedotransfer functions for predicting F.C and P.W.P using easily measurable characteristics of clay, silt, O.C, S.P, B.D and CaCO3. In order to evaluate the models, root mean square error (RMSE) and R2 were used. The value of RMSE and R2 derived by fuzzy table look-up scheme for F.C and P.W.P were (1.65, 0.87) and (1.03, 0.83), respectively.
Highlights
Developing Pedotransfer Functions for Estimating Field Capacity and Permanent Wilting Point Using Fuzzy Table Look-up Scheme
The optimal models were capable of predicting sequent depth and jump length for a wide range of conditions with a mean square error (MSE) of 10%
Data subdivided into two sets: 20% of the data for testing and the remaining 80% of the data were used for training or calibrating
Summary
Developing Pedotransfer Functions for Estimating Field Capacity and Permanent Wilting Point Using Fuzzy Table Look-up Scheme. Schaap et al (1998) developed some functions for estimation of the different parameters of van Genuchten, van Genuchten- Mualem, and Gardner equations by means of ANNs. Many studies related to modeling various soil parameters using different types of PTFs has been conducted. Schaap et al (1998) developed some functions for estimation of the different parameters of van Genuchten, van Genuchten- Mualem, and Gardner equations by means of ANNs Their results showed that with increasing the number of input data, the accuracy of functions would enhance. The present study was carried out with objective to evaluate of fuzzy table look-up scheme for estimating F.C and P.W.P using some measurable soil parameters in Ziaran region
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