The Experts below are selected from a list of 6195 Experts worldwide ranked by ideXlab platform
Qi Feng - One of the best experts on this subject based on the ideXlab platform.
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simulation of soil water and salt transfer under mulched Furrow Irrigation with saline water
Geoderma, 2015Co-Authors: Lijuan Chen, Qi FengAbstract:Abstract A mathematical model for simulating soil water and salt transfer under mulched Furrow Irrigation with saline water was presented. The model performance was evaluated by comparing the simulated values with observed data from the field experiment. The results demonstrated that the model performed reliably in the simulation of water and salt transfer under field conditions. In addition, the model was also used to simulate the process of soil water and salt transfer after saline water Irrigation. The simulation demonstrated that the increment of soil water storage below the bottom of the Furrow was nearly equal to the value below the top of the ridge immediately after the end of the Irrigation (17 h) when the downward movement of Irrigation water was restricted by the clay interlayer in soil. However, during the Irrigation interval (192 h and 384 h after the Irrigation), more water was maintained below the top of the ridge due to a considerable reduction of evaporation under mulched Furrow Irrigation. Soil salt mainly comes from saline water Irrigation and the soil salt below the top of the ridge mainly increased at the redistribution phase (17 h). During the Irrigation interval, soil conductivity in surface soil layer below the top of the ridge was smaller than that below the bottom of the Furrow, which indicated that the distribution of soil salt below the top of the ridge was more uniform than below the Furrow. The model presented here offers an efficient approach to estimate environmental effects of mulched Furrow Irrigation technology associated to saline water utilization.
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soil water and salt distribution under Furrow Irrigation of saline water with plastic mulch on ridge
Journal of Arid Land, 2013Co-Authors: Lijuan Chen, Qi FengAbstract:Furrow Irrigation when combined with plastic mulch on ridge is one of the current uppermost water-saving Irrigation technologies for arid regions. The present paper studies the dynamics of soil water-salt transportation and its spatial distribution characteristics under Irrigation with saline water in a maize field experiment. The mathematical relationships for soil salinity, Irrigation amount and water salinity are also established to evaluate the contribution of the Irrigation amount and the salinity of saline water to soil salt accumulation. The result showed that Irrigation with water of high salinity could effectively increase soil water content, but the increment is limited comparing with the influence from Irrigation amount. The soil water content in Furrows was higher than that in ridges at the same soil layers, with increments of 12.87% and 13.70% for MMF9 (the treatment with the highest water salinity and the largest amount of Irrigation water) and MMF1 (the treatment with the lowest water salinity and the least amount of Irrigation water) on 27 June, respectively. The increment for MMF9 was gradually reduced while that for MMF1 increased along with growth stages, the values for 17 August being 2.40% and 19.92%, respectively. Soil water content in the ridge for MMF9 reduced gradually from the surface layer to deeper layers while the surface soil water content for MMF1 was smaller than the contents below 20 cm at the early growing stage. Soil salinities for the treatments with the same amount of Irrigation water but different water salinity increased with the water salinity. When water salinity was 6.04 dS/m, the less water resulted in more salt accumulation in topsoil and less in deep layers. When water salinity was 2.89 dS/m, however, the less water resulted in less salt accumulation in topsoil and salinity remained basically stable in deep layers. The salt accumulation in the ridge surface was much smaller than that in the Furrow bottom under this technology, which was quite different from traditional Furrow Irrigation. The soil salinities for MMF7, MMF8 and MMF9 in the ridge surface were 0.191, 0.355 and 0.427 dS/m, respectively, whereas those in the Furrow bottom were 0.316, 0.521 and 0.631 dS/m, respectively. The result of correlation analysis indicated that compared with Irrigation amount, the Irrigation water salinity was still the main factor influencing soil salinity in Furrow Irrigation with plastic mulch on ridge.
R Ragab - One of the best experts on this subject based on the ideXlab platform.
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saltmed model as an integrated management tool for water crop soil and n fertilizer water management strategies and productivity field and simulation study
Irrigation and Drainage, 2015Co-Authors: R Ragab, A Battilani, Gordana Matovic, Radmila Stikic, Georgios Psarras, Kostas ChartzoulakisAbstract:This paper is a follow-up from a paper which described the SALTMED model. In this paper the focus is on the model application,using data of tomato and potato from field experiments in Italy, Greece (Crete) and Serbia. Drip full Irrigation, drip deficit Irrigation, drip as partial root drying (PRD), sprinkler and Furrow Irrigation were used in the 3-yr experiment between 2006 and 2008. In drip-irrigated experiments, the drip line was 10–12 cm below the surface. Dry matter, final yield, soil moisture and soil nitrogen were successfully simulated. The study showed that there is a great potential for saving water when using subsurface drip, PRD or drip deficit Irrigation compared with sprinkler and Furrow Irrigation. Depending on the crop and Irrigation system, the amount of fresh water that can be saved could vary between 14 and 44%. PRD and deficit drip Irrigation have proved to be the most efficient water application strategies with the highest water productivity.
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Effect of Irrigation methods, management and salinity of Irrigation water on tomato yield, soil moisture and salinity distribution
Irrigation Science, 2008Co-Authors: N. M. Malash, T. J. Flowers, R RagabAbstract:The increasing demand for Irrigation water to secure food for growing populations with limited water supply suggests re-thinking the use of non-conventional water resources. The latter includes saline drainage water, brackish groundwater and treated waste water. The effects of using saline drainage water (electrical conductivity of 4.2–4.8 dS m^−1) to irrigate field-grown tomato ( Lycopersicon esculentum Mill cv Floradade) using drip and Furrow Irrigation systems were evaluated, together with the distribution of soil moisture and salt. The saline water was either diluted to different salinity levels using fresh water (blended) or used cyclically with fresh water. The results of two seasons of study (2001 and 2002) showed that increasing salinity resulted in decreased leaf area index, plant dry weight, fruit total yield and individual fruit weight. In all cases, the growth parameters and yield as well as the water use efficiency were greater for drip irrigated tomato plants than Furrow-irrigated plants. However, Furrow Irrigation produced higher individual fruit weight. The electrical conductivity of the soil solution (extracted 48 h after Irrigation) showed greater fluctuations when cyclic water management was used compared to those plots irrigated with blended water. In both drip and Furrow Irrigation, measurements of soil moisture one day after Irrigation, showed that soil moisture was higher at the top 20 cm layer and at the location of the Irrigation water source; soil moisture was at a minimum in the root zone (20–40 cm layer), but showed a gradual increase at 40–60 and 60–90 cm and was stable at 90–120 cm depth. Soil water content decreased gradually as the distance from the Irrigation water source increased. In addition, a few days after Irrigation, the soil moisture content decreased, but the deficit was most pronounced in the surface layer. Soil salinity at the Irrigation source was lower at a depth of 15 cm (surface layer) than that at 30 and 60 cm, and was minimal in deeper layers (i.e. 90 cm). Salinity increased as the distance from the Irrigation source increased particularly in the surface layer. The results indicated that the salinity followed the water front. We concluded that the careful and efficient management of Irrigation with saline water can leave the groundwater salinity levels unaffected and recommended the use of drip Irrigation as the fruit yield per unit of water used was on average one-third higher than when using Furrow Irrigation.
Maryam Navabian - One of the best experts on this subject based on the ideXlab platform.
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optimum design of alternate and conventional Furrow fertigation to minimize nitrate loss
Journal of Irrigation and Drainage Engineering-asce, 2013Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Maryam Navabian, Abdolmajid Liaghat, Masoud Parsinejad, E Playan, Borja LattoreAbstract:AbstractAlternate-Furrow fertigation has shown potential to improve water and fertilizer application efficiency in irrigated areas. A combination of simulation and optimization approaches permits researchers to identify optimum design and management practices in Furrow fertigation, resulting in optimum cost, Irrigation performance, or environmental impact. The objective of this paper is to apply one-dimensional (1D) surface and two-dimensional (2D) subsurface simulation-optimization models to the minimization of nitrate losses in two types of alternate-Furrow fertigation, as follows: (1) variable alternate-Furrow Irrigation, and (2) fixed alternate-Furrow Irrigation. For comparison purposes, optimizations are also reported for conventional Furrow Irrigation. The model uses numerical surface fertigation and soil-water models to simulate water flow and nitrate transport in the soil surface and subsurface, respectively. A genetic algorithm is used to solve the optimization problem. Four decision variables (i...
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simulation of 1d surface and 2d subsurface water flow and nitrate transport in alternate and conventional Furrow fertigation
Irrigation Science, 2013Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Abdolmajid Liaghat, Masoud Parsinejad, E Playan, Maryam NavabianAbstract:Increasing water and fertilizer productivity stands as a relevant challenge for sustainable agriculture. Alternate Furrow Irrigation and surface fertigation have long been identified as water and fertilizer conserving techniques in agricultural lands. The objective of this study was to simulate water flow and fertilizer transport in the soil surface and in the soil profile for variable and fixed alternate Furrow fertigation and for conventional Furrow fertigation. An experimental data set was used to calibrate and validate two simulation models: a 1D surface fertigation model and the 2D subsurface water and solute transfer model HYDRUS-2D. Both models were combined to simulate the fertigation process in Furrow Irrigation. The surface fertigation model could successfully simulate runoff discharge and nitrate concentration for all Irrigation treatments. Six soil hydraulic and solute transport parameters were inversely estimated using the Levenberg–Marquardt optimization technique. The outcome of this process calibrated HYDRUS-2D to the observed field data. HYDRUS-2D was run in validation mode, simulating water content and nitrate concentration in the soil profiles of the wet Furrows, ridges and dry Furrows at the upstream, middle and downstream parts of the experimental field. This model produced adequate agreement between measured and predicted soil water content and nitrate concentration. The combined model stands as a valuable tool to better design and manage fertigation in alternate and conventional Furrow Irrigation.
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comparison of one and two dimensional models to simulate alternate and conventional Furrow fertigation
Journal of Irrigation and Drainage Engineering-asce, 2012Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Abdolmajid Liaghat, Masoud Parsinejad, Maryam NavabianAbstract:AbstractSimulation models have recently been used in many studies for simulation of water flow and solute transport in soil under different Irrigation systems. The objective of this study was to compare the HYDRUS-1D and HYDRUS-2D simulation models to simulate water and nitrate transfer for three Furrow Irrigation technologies [conventional Furrow Irrigation (CFI), fixed alternate Furrow Irrigation (FFI), and variable alternate Furrow Irrigation (AFI)] under fertigation practice. Filed measured data were used to calibrate and validate the one-dimensional (1D) and two-dimensional (2D) HYDRUS models. An inverse solution technique was applied to optimize soil-hydraulic and solute transport parameters to calibrate the models. The results indicated that the HYDRUS-2D model provided better performance to predict soil water contents, nitrate concentrations, and deep percolation caused by the geometry of the infiltration domain in Furrow Irrigation. Standard errors for HYDRUS-1D ranged from 0.107 to 0.170 for soi...
Lijuan Chen - One of the best experts on this subject based on the ideXlab platform.
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simulation of soil water and salt transfer under mulched Furrow Irrigation with saline water
Geoderma, 2015Co-Authors: Lijuan Chen, Qi FengAbstract:Abstract A mathematical model for simulating soil water and salt transfer under mulched Furrow Irrigation with saline water was presented. The model performance was evaluated by comparing the simulated values with observed data from the field experiment. The results demonstrated that the model performed reliably in the simulation of water and salt transfer under field conditions. In addition, the model was also used to simulate the process of soil water and salt transfer after saline water Irrigation. The simulation demonstrated that the increment of soil water storage below the bottom of the Furrow was nearly equal to the value below the top of the ridge immediately after the end of the Irrigation (17 h) when the downward movement of Irrigation water was restricted by the clay interlayer in soil. However, during the Irrigation interval (192 h and 384 h after the Irrigation), more water was maintained below the top of the ridge due to a considerable reduction of evaporation under mulched Furrow Irrigation. Soil salt mainly comes from saline water Irrigation and the soil salt below the top of the ridge mainly increased at the redistribution phase (17 h). During the Irrigation interval, soil conductivity in surface soil layer below the top of the ridge was smaller than that below the bottom of the Furrow, which indicated that the distribution of soil salt below the top of the ridge was more uniform than below the Furrow. The model presented here offers an efficient approach to estimate environmental effects of mulched Furrow Irrigation technology associated to saline water utilization.
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soil water and salt distribution under Furrow Irrigation of saline water with plastic mulch on ridge
Journal of Arid Land, 2013Co-Authors: Lijuan Chen, Qi FengAbstract:Furrow Irrigation when combined with plastic mulch on ridge is one of the current uppermost water-saving Irrigation technologies for arid regions. The present paper studies the dynamics of soil water-salt transportation and its spatial distribution characteristics under Irrigation with saline water in a maize field experiment. The mathematical relationships for soil salinity, Irrigation amount and water salinity are also established to evaluate the contribution of the Irrigation amount and the salinity of saline water to soil salt accumulation. The result showed that Irrigation with water of high salinity could effectively increase soil water content, but the increment is limited comparing with the influence from Irrigation amount. The soil water content in Furrows was higher than that in ridges at the same soil layers, with increments of 12.87% and 13.70% for MMF9 (the treatment with the highest water salinity and the largest amount of Irrigation water) and MMF1 (the treatment with the lowest water salinity and the least amount of Irrigation water) on 27 June, respectively. The increment for MMF9 was gradually reduced while that for MMF1 increased along with growth stages, the values for 17 August being 2.40% and 19.92%, respectively. Soil water content in the ridge for MMF9 reduced gradually from the surface layer to deeper layers while the surface soil water content for MMF1 was smaller than the contents below 20 cm at the early growing stage. Soil salinities for the treatments with the same amount of Irrigation water but different water salinity increased with the water salinity. When water salinity was 6.04 dS/m, the less water resulted in more salt accumulation in topsoil and less in deep layers. When water salinity was 2.89 dS/m, however, the less water resulted in less salt accumulation in topsoil and salinity remained basically stable in deep layers. The salt accumulation in the ridge surface was much smaller than that in the Furrow bottom under this technology, which was quite different from traditional Furrow Irrigation. The soil salinities for MMF7, MMF8 and MMF9 in the ridge surface were 0.191, 0.355 and 0.427 dS/m, respectively, whereas those in the Furrow bottom were 0.316, 0.521 and 0.631 dS/m, respectively. The result of correlation analysis indicated that compared with Irrigation amount, the Irrigation water salinity was still the main factor influencing soil salinity in Furrow Irrigation with plastic mulch on ridge.
Hamed Ebrahimian - One of the best experts on this subject based on the ideXlab platform.
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optimum design of alternate and conventional Furrow fertigation to minimize nitrate loss
Journal of Irrigation and Drainage Engineering-asce, 2013Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Maryam Navabian, Abdolmajid Liaghat, Masoud Parsinejad, E Playan, Borja LattoreAbstract:AbstractAlternate-Furrow fertigation has shown potential to improve water and fertilizer application efficiency in irrigated areas. A combination of simulation and optimization approaches permits researchers to identify optimum design and management practices in Furrow fertigation, resulting in optimum cost, Irrigation performance, or environmental impact. The objective of this paper is to apply one-dimensional (1D) surface and two-dimensional (2D) subsurface simulation-optimization models to the minimization of nitrate losses in two types of alternate-Furrow fertigation, as follows: (1) variable alternate-Furrow Irrigation, and (2) fixed alternate-Furrow Irrigation. For comparison purposes, optimizations are also reported for conventional Furrow Irrigation. The model uses numerical surface fertigation and soil-water models to simulate water flow and nitrate transport in the soil surface and subsurface, respectively. A genetic algorithm is used to solve the optimization problem. Four decision variables (i...
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simulation of 1d surface and 2d subsurface water flow and nitrate transport in alternate and conventional Furrow fertigation
Irrigation Science, 2013Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Abdolmajid Liaghat, Masoud Parsinejad, E Playan, Maryam NavabianAbstract:Increasing water and fertilizer productivity stands as a relevant challenge for sustainable agriculture. Alternate Furrow Irrigation and surface fertigation have long been identified as water and fertilizer conserving techniques in agricultural lands. The objective of this study was to simulate water flow and fertilizer transport in the soil surface and in the soil profile for variable and fixed alternate Furrow fertigation and for conventional Furrow fertigation. An experimental data set was used to calibrate and validate two simulation models: a 1D surface fertigation model and the 2D subsurface water and solute transfer model HYDRUS-2D. Both models were combined to simulate the fertigation process in Furrow Irrigation. The surface fertigation model could successfully simulate runoff discharge and nitrate concentration for all Irrigation treatments. Six soil hydraulic and solute transport parameters were inversely estimated using the Levenberg–Marquardt optimization technique. The outcome of this process calibrated HYDRUS-2D to the observed field data. HYDRUS-2D was run in validation mode, simulating water content and nitrate concentration in the soil profiles of the wet Furrows, ridges and dry Furrows at the upstream, middle and downstream parts of the experimental field. This model produced adequate agreement between measured and predicted soil water content and nitrate concentration. The combined model stands as a valuable tool to better design and manage fertigation in alternate and conventional Furrow Irrigation.
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comparison of one and two dimensional models to simulate alternate and conventional Furrow fertigation
Journal of Irrigation and Drainage Engineering-asce, 2012Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Abdolmajid Liaghat, Masoud Parsinejad, Maryam NavabianAbstract:AbstractSimulation models have recently been used in many studies for simulation of water flow and solute transport in soil under different Irrigation systems. The objective of this study was to compare the HYDRUS-1D and HYDRUS-2D simulation models to simulate water and nitrate transfer for three Furrow Irrigation technologies [conventional Furrow Irrigation (CFI), fixed alternate Furrow Irrigation (FFI), and variable alternate Furrow Irrigation (AFI)] under fertigation practice. Filed measured data were used to calibrate and validate the one-dimensional (1D) and two-dimensional (2D) HYDRUS models. An inverse solution technique was applied to optimize soil-hydraulic and solute transport parameters to calibrate the models. The results indicated that the HYDRUS-2D model provided better performance to predict soil water contents, nitrate concentrations, and deep percolation caused by the geometry of the infiltration domain in Furrow Irrigation. Standard errors for HYDRUS-1D ranged from 0.107 to 0.170 for soi...
