Abstract
Drip irrigation is one of the conservative irrigation techniques since it implies supplying water directly on the soil through the emitter; it can supply water and fertilizer directly into the root zone. An equation to estimate the wetted area in unsaturated soil is taking into calculating the water absorption by roots is simulated numerically using HYDRUS (2D/3D) software. In this paper, HYDRUS comprises analytical types of the estimate of different soil hydraulic properties. Used one soil type, sandy loam, with three types of crops; (corn, tomato, and sweet sorghum), different drip discharge, different initial soil moisture content was assumed, and different time durations. The relative error for the different hydraulic soil models was calculated and was compared with the model of Brooks and Corey, 1964. There was good agreement compared with different models. The Root Mean Square Error (RMSE) was (0.23) cm, while the relative error (- 1%) and (1) for modeling efficiency (EF) for wetted radius, but wetted depth was RMSE (0.99) cm, and the relative error was (4.5%), and EF was (1).
Highlights
Surface drip irrigation system is increasingly used in arid regions with limited water resources to irrigate crops, so the water content of the plant root zone can reach an optimum level
Simulated and measured water contents were in good agreement, with value of 0.94 and 0.99 and a root mean squared error (RMSE) of 0.015
The results show that the physical barrier was more efficient from double drip irrigation to strengthen the distribution of water and solute concentration transport in soils in the root region
Summary
Surface drip irrigation system is increasingly used in arid regions with limited water resources to irrigate crops, so the water content of the plant root zone can reach an optimum level. Simulated and measured water contents were in good agreement, with value of 0.94 and 0.99 and a root mean squared error (RMSE) of 0.015. Data to assess the relationship were obtained by reducing the moisture differences found between the field literature recorded depletions of 28 crops and Richards equation based numerically simulated depletion of soil moisture is combined with the moisture uptake configuration of root water uptake. A., 2018), studied the wetted zone (wetted radius and depth) under surface trickle point source with crops, and developed an equation to estimate the radius and depth of the wetted soil taking to calculate evaporation and extraction water by plants roots with different soil types in Iraq. (Khalil and Abid, 2019), simulated soil wetting pattern around a drip surface irrigation of water application depending primarily on hydraulic soil properties, discharge of drip, time of durations, and root water uptake. To study the effect of different models of root uptake on the wetted area from a surface emitter
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