Potatoes (Solanum tu*erosum L. cv. Folva) rate fourth in production rate among the worldSs variou... more Potatoes (Solanum tu*erosum L. cv. Folva) rate fourth in production rate among the worldSs various agricultural products after wheat, rice and corn (FAO, 1995). As a shallow-rooted crop, irrigation is crucial for growing potato plants even in humid areas. A high level of nitrogen (N) is recommended for potato cropping (Darwish et al., 2003) to ensure acceptable yield. Potatoes are mainly grown on sandy soils with a low water holding capacity and thus with a high risk of leaching of nitrogen under excess irrigation or precipitation events. Introducing efficient irrigation practices may reduce these potential losses (Shahnazari et al., 2008; Shahnazari et al., 2007). During the last decade a novel irrigation strategy, partial root-zone drying (PRD), has been developed (Dry and Loveys, 2000). In PRD approach the root zone is irrigated alternatively so that in each irrigation event half of the root zone is not irrigated. In this study potatoes were grown to investigate how PRD and FI ir...
The effects of partial root-zone drying (PRD), as compared to deficit irrigation (DI) and full ir... more The effects of partial root-zone drying (PRD), as compared to deficit irrigation (DI) and full irrigation (FI), on strawberry (cv. Honeoye) berry yield, yield components and irrigation water use efficiency (WUE I ) were investigated in a field lysimeter under an automatic rain-out shelter. The ...
Experiments were conducted in lysimeters with sandy soil under an automatic rain-out shelter to s... more Experiments were conducted in lysimeters with sandy soil under an automatic rain-out shelter to study the effects of subsurface drip irrigation treatments, full irrigation (FI), deficit irrigation (DI) and partial root-zone drying (PRD), on nitrogen (N) dynamics in the soil-plant system ...
Declining water resources and limited clean water reservoirs call for more efficient water use fo... more Declining water resources and limited clean water reservoirs call for more efficient water use for food production in the future. The objective of this research was to compare different irrigation methods based on a parametric evaluation system in an area of 60,000ha in the Dosalegh plain of the Khuzestan province, in the southwest of Iran. After the soil properties were
... potatoes Finn Plauborg 1 , Mathias N. Andersen 1 , Bo V. Iversen 1 , Poul Erik Lærke 1 , Tove... more ... potatoes Finn Plauborg 1 , Mathias N. Andersen 1 , Bo V. Iversen 1 , Poul Erik Lærke 1 , Tove Heidmann 1 , Ali Shahnazari 2 and Fulai Liu 2 1) University of Aarhus, Faculty of Agricultural Sciences, Dept. ... 0 10 20 30 40 50 60 70 Tota l yie ld (t/ha ) -6 -3 0 3 6 9 12 15 ...
W ater pricing is considered as one of the most important management tools of water resources, wh... more W ater pricing is considered as one of the most important management tools of water resources, which can result in optimized allocation in the agricultural sector. In this regard, this study estimated the cost of water and the value of water in the farmlands covered by the selected manmade ponds (MMPs) within the Alborz project area in Mazandaran Province using the engineering economics methods and production function calculation. The required data were collected via a survey conducted in 2013-2014 growing season. Sample size was estimated to be 198 people. After studying various production functions, transcendental production function was chosen as the best functional form. Next, the economic value of water for rice in the basin covered by the selected MMPs was calculated to be 19,065 IRR per m 3 using an estimation of the production function. In addition, the cost of water per m 3 in the selected MMPs was obtained as to be 868 IRR at the interest rate of 22% and 394 IRR at the int...
In the last few years, trend identification has become an important issue in hydrological time-se... more In the last few years, trend identification has become an important issue in hydrological time-series analyses; it is also a difficult task, due to the variety of models and the impact of climate change on the river flow regime. Due to the vital importance of the Anzali Lagoon to the environment of the region, and the threat to its health caused by the volume or amount of inlet sediments, we decided to study the changes in flow and sediment in the rivers flowing into the Anzali Lagoon. For the present study, the long-term monthly, seasonal, and annual sediment and discharge data of seven stations were obtained during the period 1985–2019. According to the available information, the trend of sediment load variation was investigated at different time scales. In this study, the Mann–Kendall statistical test, the double-mass curve, and performance fitting were used to assess the seasonal and annual trends in sediment and river flow. The results showed that at Aghamahale station, the low...
The p resent stu d y was carried ou t to evaluate three interp olation method s inclu d ing weigh... more The p resent stu d y was carried ou t to evaluate three interp olation method s inclu d ing weighted moving average (WMA) with the p ower of 2 and 3, Kriging and Cokriging method s. Data of 23 wells in Mazand aran p rovince were collected in fall and sp ring 2006. Seven p arameters inclu d ing electrical cond u ctivity (EC), pH , total d issolved solid s (TDS), sod ium ad sorp tion ratio (SAR), total hard ness (TH), chlorid e concentration (Cl- ) and su lp hate concentration (SO4 2- ) have been chosen as grou nd water qu ality ind ices in the stu d y area. Variogram analysis and extracting the sp atial d istribu tion map s of grou nd water qu ality p arameters were d one u sing Geostatistics extension p rogram in GIS environment . All interp olation method s have been evalu ated based on mean bias error (MBE) and mean absolu te error (MAE) criteria. The sp herical mod el for semi-variograms had the less valu e of RSS (resid u al su m of squ are) for Cl-, EC, p H, SAR and SO4 2- p ar...
The International Journal of Plant, Animal and Environmental Sciences, 2014
MIKEBASIN is one of major applied decision support system which developed for sustainable simulat... more MIKEBASIN is one of major applied decision support system which developed for sustainable simulation and water allocation management in river basin. The objective of this study is evaluating the application of this model in Alborz integrated land and water management project. In this regard, the project area is divided into 20 water user associations and water supply resources including surface water, Ab-bandans and groundwater. As a matter of water allocation to WUAs, the simulation of resources and demand was done monthly in 28 years with the data of main catchment runoff and sub-catchment, reservoir and demand of WUAs, groundwater and Ab-bandans. In assessing the condition of water resources allocation by MIKEBASIN model in WUAs, demand volume with the aim of minimizing the deficiencies and spatial priorities on the basis of any association was evaluated. Accordingly upstream WUAs received more water. Also the result showed that demand of 460 MCM of WUAs, 277.02 MCM is supplied f...
This study was carried out to understand the effects of conventional irrigation (CI), regulated d... more This study was carried out to understand the effects of conventional irrigation (CI), regulated deficit irrigation (RDI 70 and RDI 50 ) and partial root zone drying (PRD 70 and PRD 50 ) treatments on water productivity and water use efficiency of sunflower in the Ahwaz Plain, Iran. Irrigation water productivity for seed yield (WP(Ir)Y) and water use efficiency for seed yield (WUE(Y)) were not significantly affected by conventional and limited irrigation treatments. In this study, the highest (WP(Ir) Y) was obtained by limited irrigation treatments (RDI 50 , PRD 50 and RDI 70 treatments, with mean 11.62, 11.37 and 11.12 kg mm -1 , respectively.), whereas the lowest (WP(Ir)Y) was obtained from the CI treatment (10.74 kg mm -1 ). The maximum WUE(Y) was related to RDI 50 , PRD 50 and RDI 70 treatments, averaged 13.88, 13.59 and 13.29 kg mm -1 , respectively. The minimum one was also associated with CI treatment. averaged 12.48 kg mm -1 . It is concluded that the CI treatment is the best...
Potatoes (Solanum tu*erosum L. cv. Folva) rate fourth in production rate among the worldSs variou... more Potatoes (Solanum tu*erosum L. cv. Folva) rate fourth in production rate among the worldSs various agricultural products after wheat, rice and corn (FAO, 1995). As a shallow-rooted crop, irrigation is crucial for growing potato plants even in humid areas. A high level of nitrogen (N) is recommended for potato cropping (Darwish et al., 2003) to ensure acceptable yield. Potatoes are mainly grown on sandy soils with a low water holding capacity and thus with a high risk of leaching of nitrogen under excess irrigation or precipitation events. Introducing efficient irrigation practices may reduce these potential losses (Shahnazari et al., 2008; Shahnazari et al., 2007). During the last decade a novel irrigation strategy, partial root-zone drying (PRD), has been developed (Dry and Loveys, 2000). In PRD approach the root zone is irrigated alternatively so that in each irrigation event half of the root zone is not irrigated. In this study potatoes were grown to investigate how PRD and FI ir...
The effects of partial root-zone drying (PRD), as compared to deficit irrigation (DI) and full ir... more The effects of partial root-zone drying (PRD), as compared to deficit irrigation (DI) and full irrigation (FI), on strawberry (cv. Honeoye) berry yield, yield components and irrigation water use efficiency (WUE I ) were investigated in a field lysimeter under an automatic rain-out shelter. The ...
Experiments were conducted in lysimeters with sandy soil under an automatic rain-out shelter to s... more Experiments were conducted in lysimeters with sandy soil under an automatic rain-out shelter to study the effects of subsurface drip irrigation treatments, full irrigation (FI), deficit irrigation (DI) and partial root-zone drying (PRD), on nitrogen (N) dynamics in the soil-plant system ...
Declining water resources and limited clean water reservoirs call for more efficient water use fo... more Declining water resources and limited clean water reservoirs call for more efficient water use for food production in the future. The objective of this research was to compare different irrigation methods based on a parametric evaluation system in an area of 60,000ha in the Dosalegh plain of the Khuzestan province, in the southwest of Iran. After the soil properties were
... potatoes Finn Plauborg 1 , Mathias N. Andersen 1 , Bo V. Iversen 1 , Poul Erik Lærke 1 , Tove... more ... potatoes Finn Plauborg 1 , Mathias N. Andersen 1 , Bo V. Iversen 1 , Poul Erik Lærke 1 , Tove Heidmann 1 , Ali Shahnazari 2 and Fulai Liu 2 1) University of Aarhus, Faculty of Agricultural Sciences, Dept. ... 0 10 20 30 40 50 60 70 Tota l yie ld (t/ha ) -6 -3 0 3 6 9 12 15 ...
W ater pricing is considered as one of the most important management tools of water resources, wh... more W ater pricing is considered as one of the most important management tools of water resources, which can result in optimized allocation in the agricultural sector. In this regard, this study estimated the cost of water and the value of water in the farmlands covered by the selected manmade ponds (MMPs) within the Alborz project area in Mazandaran Province using the engineering economics methods and production function calculation. The required data were collected via a survey conducted in 2013-2014 growing season. Sample size was estimated to be 198 people. After studying various production functions, transcendental production function was chosen as the best functional form. Next, the economic value of water for rice in the basin covered by the selected MMPs was calculated to be 19,065 IRR per m 3 using an estimation of the production function. In addition, the cost of water per m 3 in the selected MMPs was obtained as to be 868 IRR at the interest rate of 22% and 394 IRR at the int...
In the last few years, trend identification has become an important issue in hydrological time-se... more In the last few years, trend identification has become an important issue in hydrological time-series analyses; it is also a difficult task, due to the variety of models and the impact of climate change on the river flow regime. Due to the vital importance of the Anzali Lagoon to the environment of the region, and the threat to its health caused by the volume or amount of inlet sediments, we decided to study the changes in flow and sediment in the rivers flowing into the Anzali Lagoon. For the present study, the long-term monthly, seasonal, and annual sediment and discharge data of seven stations were obtained during the period 1985–2019. According to the available information, the trend of sediment load variation was investigated at different time scales. In this study, the Mann–Kendall statistical test, the double-mass curve, and performance fitting were used to assess the seasonal and annual trends in sediment and river flow. The results showed that at Aghamahale station, the low...
The p resent stu d y was carried ou t to evaluate three interp olation method s inclu d ing weigh... more The p resent stu d y was carried ou t to evaluate three interp olation method s inclu d ing weighted moving average (WMA) with the p ower of 2 and 3, Kriging and Cokriging method s. Data of 23 wells in Mazand aran p rovince were collected in fall and sp ring 2006. Seven p arameters inclu d ing electrical cond u ctivity (EC), pH , total d issolved solid s (TDS), sod ium ad sorp tion ratio (SAR), total hard ness (TH), chlorid e concentration (Cl- ) and su lp hate concentration (SO4 2- ) have been chosen as grou nd water qu ality ind ices in the stu d y area. Variogram analysis and extracting the sp atial d istribu tion map s of grou nd water qu ality p arameters were d one u sing Geostatistics extension p rogram in GIS environment . All interp olation method s have been evalu ated based on mean bias error (MBE) and mean absolu te error (MAE) criteria. The sp herical mod el for semi-variograms had the less valu e of RSS (resid u al su m of squ are) for Cl-, EC, p H, SAR and SO4 2- p ar...
The International Journal of Plant, Animal and Environmental Sciences, 2014
MIKEBASIN is one of major applied decision support system which developed for sustainable simulat... more MIKEBASIN is one of major applied decision support system which developed for sustainable simulation and water allocation management in river basin. The objective of this study is evaluating the application of this model in Alborz integrated land and water management project. In this regard, the project area is divided into 20 water user associations and water supply resources including surface water, Ab-bandans and groundwater. As a matter of water allocation to WUAs, the simulation of resources and demand was done monthly in 28 years with the data of main catchment runoff and sub-catchment, reservoir and demand of WUAs, groundwater and Ab-bandans. In assessing the condition of water resources allocation by MIKEBASIN model in WUAs, demand volume with the aim of minimizing the deficiencies and spatial priorities on the basis of any association was evaluated. Accordingly upstream WUAs received more water. Also the result showed that demand of 460 MCM of WUAs, 277.02 MCM is supplied f...
This study was carried out to understand the effects of conventional irrigation (CI), regulated d... more This study was carried out to understand the effects of conventional irrigation (CI), regulated deficit irrigation (RDI 70 and RDI 50 ) and partial root zone drying (PRD 70 and PRD 50 ) treatments on water productivity and water use efficiency of sunflower in the Ahwaz Plain, Iran. Irrigation water productivity for seed yield (WP(Ir)Y) and water use efficiency for seed yield (WUE(Y)) were not significantly affected by conventional and limited irrigation treatments. In this study, the highest (WP(Ir) Y) was obtained by limited irrigation treatments (RDI 50 , PRD 50 and RDI 70 treatments, with mean 11.62, 11.37 and 11.12 kg mm -1 , respectively.), whereas the lowest (WP(Ir)Y) was obtained from the CI treatment (10.74 kg mm -1 ). The maximum WUE(Y) was related to RDI 50 , PRD 50 and RDI 70 treatments, averaged 13.88, 13.59 and 13.29 kg mm -1 , respectively. The minimum one was also associated with CI treatment. averaged 12.48 kg mm -1 . It is concluded that the CI treatment is the best...
Uploads
Papers by Ali Shahnazari