Irrigation and Water Engineering

Irrigation and Water Engineering

Estimation of Moisture, Nitrification Rate and Urea Hydrolysis in Soil Using Intelligent Combined-Wavelet Methods

Document Type : Original Article

Authors
Ali Shahnazari 1
sarvin zamanzad ghavidel 2
1 Associate Professor, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. Email
2 Postdoctoral Researcher, Institut national de la recherche scientifique (INRS), Centre Eau Terre Environnement, Quebec City, Canada, E-mail: sarvin.zamanzad-ghavidel@inrs.ca
10.22125/iwe.2023.410046.1739
Abstract
Investigating the effect of agricultural management methods on the amount of nitrate and urea in the soil has special importance. The purpose of this study is to model and investigate the interrelation of hydraulic, reactivity, and solute absorption variables of different soil depths collected in the year of (2020-2021) from the pilot rice farm located in the Sari Agricultural Sciences and Natural Resources University, Mazandaran province, with an area of 0.6 hectares. In this study, the residual moisture of the soil (θr), nitrification rate (kn), and urea hydrolysis rate (kh) variables were modeled based on four, four, and two defined scenarios, respectively, using Wavelet-Artificial Neural Network (WANN), Wavelet- Artificial Neural-Fuzzy Inference System (WANFIS), and Wavelet-Gene Expression Programming (WGEP) models. The results showed that the performance improvement percentage of WGEP models compared to WANFIS and WANFIS model compared to WANN considering the RMSE evaluation index were obtained (16.96, 41.87), (85.72, 1.00), and (20.37, 3.27) for three variables of θr, kn, and kh, respectively. the volumetric residual moisture in the soil, and the urea hydrolysis rate variable is also highly dependent on the residual moisture in the soil. Also, the results showed that the hydraulic variables, reactivity and absorption of soil solutes can be affected by the climatic conditions of the region. Therefore, providing intelligent applicable models to estimate nitrate and urea variables in soil can help managers and farmers in proper management of water and soil resources and optimal use of nitrogen fertilizer with less time and cost.
Keywords
Artificial Intelligence
Humidity
Soil
Solutes
Wavelet
Subjects
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