Abdolmajid Liaghat

University of Tehran | UT · Department of Irrigation and Reclamation Engineering

Today, despite the idea that people may have about agriculture, it is a complex, time-consuming, and expensive process. Still, the reality is that today's agriculture industry is data-driven, accurate, smarter, and even easier. It has changed more compared to the past. All these cases have been formed with the help of a new concept called the Inter...

One of the common methods to estimate the yield of crops before their harvest is the use of satellite images and remote sensing technology. One of the efficient methods extracted from remote sensing data to monitor crop yield is the use of spectral indices. This study was carried out to estimate maize yield before its harvest using Landsat 8 sat...

The knowledge about soil hydraulic properties (i.e., water retention and hydraulic conductivity characteristics) is of relevance for accurate determination of land surface fluxes. Yet, the laborious and time-consuming process of measuring the soil water retention curve (SWRC) with conventional laboratory methods poses a challenge. In addition, the...

For this purpose, a moisture sensor device was designed and constructed in February and March 2019 to determine the appropriate time to stop irrigation in furrow irrigation. Testing the device in the laboratory and its application in the Farm of the Campus of Agriculture and Natural Resources, University of Tehran (Mohammad Shahr), Iran, from April...

So far, many studies have examined the effects of surface (FF) and drip (DF) fertigation compared to surface (FC) and drip (DC) irrigation along with fertilization at different levels of fertilizer on crop yield indices, nutrient use efficiency (NUE), and irrigation water productivity (WP); however, each of them have been conducted under different...

The soil water retention curve (SWRC) is an essential soil property that relates soil water content and matric potential. It plays a crucial role in soil water dynamics and the understanding of various hydrological phenomena at the land surface, including infiltration, runoff, evaporation, and energy exchange processes. In recent years, proximal se...

Background Changes in vegetation can have a significant effect on drought and dust in the western and southwestern regions of the country. Vegetation acts as an important factor in the balance of water and soil, the amount of transpiration evaporation, water absorption, reducing soil erosion, and stabilizing soil and dust particles. If vegetation...

یکی از روش‌هایی که در افزایش راندمان مصرف آب آبیاری اهمیت ویژه‌ای دارد، استفاده از سیستم‌های هوشمند آبیاری در مزرعه است که به‌طور دقیق رطوبت خاک مزارع و وضعیت آب‌وهوا را تعیین می‌کند. سیستم‌‌های مدیریت آبیاری هوشمند مبتنی بر اینترنت اشیا می‌توانند در دست‌یابی به مصرف بهینه آب و کشاورزی دقیق کمک کنند. صنعـت کشـاورزی در سال‌های اخیـر، بـا استفاده از...

Due to the drought, water and food security in the country is facing serious challenges, and a precise and science-based implementation plan is needed. The use of new technologies, such as modern irrigation systems, is essential as an effective tool for optimal water use. Therefore, this study was conducted to investigate the yield, yield component...

The deterioration of water quality for agricultural use has led to increased soil salinity levels, prompting the need for efficient water management practices. This study investigated the impact of varying levels of soil salinity on infiltration coefficients using undisturbed soil samples from the Qazvin saline area. The double-ring method was empl...

This research aimed to select essential features for modeling the cost of pressurized irrigation systems using the data of 515 drip irrigation projects in four parts, including the cost of pumping station and central control system (TCP), cost of on-farm equipment (TCF), cost of installation and operation on-farm and pumping station (TCI), and tota...

Soil hydraulic properties, including soil water retention, control various terrestrial hydrological processes such as infiltration, runoff, and evapotranspiration. Measuring and monitoring these properties at large scales is challenging. Therefore, over the past decade, remote sensing has been investigated as a promising tool for large-scale mappin...

With the increasing limitation of water resources and high water demand of the agricultural crops, the importance of unconventional water and its ability to be used in agriculture is very important. Recently, the use of municipal wastewater treatment plant effluent as an unconventional source of water and a sustainable source of water for irrigatio...

With the increase in the volume of municipal wastewater and due to the upcoming droughts and lack of water resources, increasing water use efficiency and reuse of municipal wastewater is inevitable. In this study, the use of effluent of Hashtgerd city wastewater treatment in peach tree irrigation was investigated. Soil sampling was performed eight...

Iran has an arid to semi‐arid climate where water resources are limited. Irrigation planning plays an essential role in the growth and development of crops. This study aims to enhance the current status of irrigation scheduling and improve farm water management on sugarcane farms in Khuzestan province, Iran. The AquaCrop model and the surface energ...

رشد جمعیت طی دهه‌های گذشته متناسب با رشد سایر بخش‌های تولیدی و رفاهی کشور نبوده است و همین عامل سبب شده که محدودیت‌ها و تنگناهایی در سایر بخش‌ها به‌خصوص منابع آب و تأمین غذا به وجود آید. به‌طوری‌که سرانه آب تجدید پذیر کشور نسبت به سال ۱۳۰۰ شمسی به حدود یک‌هفتم کاهش یافته است. متأسفانه علی‌رغم وجود ظرفیت‌های بالقوه ارزشمند در بخش کشاورزی، عملکرد و ت...

Increasing green space and afforestation in arid and semi-arid regions has always been accompanied by water shortages. Species with lower water requirements have always been an executive policy in these areas. The aim of this study was to estimate the water requirement of Acer negundo and Pinus eldarica Medw as the main species that applied in gree...

With the increase of urban population and the development of various industries, the demand for water and the production of pollutants, especially heavy metals, is increasing and the share of agricultural water is decreasing. One of the ways out of the water crisis is to use polluted and non-conventional water. Given that agriculture is the largest...

The main objective of this study was to optimize the environmental conditions for maximum growth of Dunaliella Salina algae. Results depicted that increase in temperature caused an increase in specific growth rate and a decrease in cell’s population doubling time. The highest specific growth rate and the shortest cell’s doubling time were observed...

Asset allocation to pressurized irrigation systems along with evaluating their efficiency has been considered by water industry experts and officials in recent years. To this purpose, identifying the factors and components affecting the costs of an irrigation system is a very important issue that has received less attention. On the other hand, one...

Considering the environmental consequences and economic damages of dust storms, the study, and analysis of this meteorological phenomenon are of great importance. Many studies have shown the effect of climatic signals on the intensity, duration, and time of occurrence of hydrological phenomena, but the relationship between the ENSO phenomenon and d...

Due to the scarcity of water resources, sensitivity to the water quality of the rivers and factors affecting them is essential. Although drainage enables crop production in saline soils, drainage drains can transport contaminated material to the surface and groundwater. In this study, salinity prediction of Karkheh River after exploitation of irrig...

Since the creation of green space depends on the availability of water and dedicated water for irrigation of urban green space, green belts and afforestation in arid and semi-arid climates. Water availability has great value and should be used optimally with high efficiency. For this reason, in order to save water, planting species that need less w...

Allocation of budget to pressurized irrigation projects is supported by the government to manage, saving water resources and increase agricultural production and is considered as the ideal project of the country. Cost-effectiveness and awareness of the cost of an irrigation system is important and necessary for the government. Therefore, estimating...

The aim of this study was to investigate the possibility of using lead contaminated water in surface irrigation and subirrigation and its effect on silage maize yield. In this regard, lysimeter experiments were conducted in the College of Agriculture and Natural Resources, University of Tehran in 2017 in the form of factorial experiment in a comple...

Proximal and remote sensing techniques in the optical domain are cost-effective alternatives to standard soil property characterization methods. However, the extent of light penetration into the soil sample, also termed soil information depth, is not well understood. In this study a new analytical model that links the particle size distribution and...

The impact of the dust phenomenon in Iran is so great that it has involved more than half of the country's provinces in some way with the problems and limitations of this natural phenomenon, which in addition to environmental impacts, has disrupted the implementation of sustainable national development plans and so far it has had and will have many...

In arid and semi arid regions that are affected by drought, maintaining and developing vegetation and green space is facing by serious challenges of waterless. The purpose of this study is to compare the water requirement of Fraxinus rotundifolia Mill and Morus alba as common species in Robat Karim, located in the southwest of Tehran province. This...

The increase in dust storms occurrence in recent years in southwestern Iran, especially in Khuzestan province, and consequently the decrease in air quality in these areas, has doubled the importance of forecasting and linking this phenomenon with climate variations. The aim of this study was to investigate the efficiency of hybrid Genetic-Annealing...

7 ‫شمارۀ‬ ، 4 ‫زمستان‬ ، 1399 ‫ص‬ ، 919-907 ‫شبیه‬ ‫سازی‬ ‫تداخل‬ ‫آب‬ ‫شور‬ ‫و‬ ‫شیرين‬ ‫در‬ ‫ناحی‬ ‫ۀ‬ ‫اشباع‬ ‫و‬ ‫غیر‬ ‫اشباع‬ ‫خاك‬ ‫با‬ ‫استفاده‬ ‫از‬ ‫مدل‬ ‫عددی‬ ‫و‬ ‫فیزيکی‬ HYDRUS-2D ‫ربانیها‬ ‫حسین‬ 1 ‫عبدالمجید‬ ، ‫لیاقت‬ 2 * ‫سلطانی‬ ‫مسعود‬ ، 3 1 ‫کارشناسی‬ ‫دانشجوی‬. ‫تهران‬ ‫دانشگاه‬ ‫طبیعی‬ ‫منابع‬ ‫و‬ ‫کشاورزی‬ ‫پردیس‬ ‫آبادانی‬ ‫...

The phenomenon of mixing saline and fresh water in aquifers near the sea coasts and the margin of salt marshland, limits the application of high-quality groundwater resources. On the other hand, by increasing concentration of saline water in aquifer due to evaporation from the soil surface and also decreasing pressure head in freshwater aquifers as...

In this research, water productivity of annual crops in Moghan plain using physical and economic productivity indices were evaluated and the relationship between physical and economic productivity based on field data has were analyzed. The physical productivity of wheat, canola, soybean, rice, corn, forage, corn, melon, alfalfa, tomato, barley, nec...

The poor performance of irrigation districts led to the unreliable distribution of surface water among farmers. Therefore, it is necessary to improve the water distribution in the irrigation district. For this purpose, there are two practical solutions, improve operational method and adjustment of estimation of agricultural water demand, each of wh...

Different regions have different potentials in dust release, and the increase in dust storms indicates the dominance of the desert ecosystem in each region. Prediction of the occurrence of dust storms in critical regions allow desion-makers to efficiently manage and to mitigate its probable damages to landscape. This study aims to predict the frequ...

The objective of this study was to assess the different scenarios for improving the irrigation application efficiency of a two‐row bed furrow irrigation system (wide furrow) using the SIRMOD model in six sugar beet fields of the Moghan plain for the 2015–2016 growing season. The Moghan plain is situated in the Ardebil province of Iran. Therefore, f...

Inverse modeling is a relatively complex procedure that allows quick estimation of soil hydraulic properties, yielding parameters for both soil water retention and unsaturated hydraulic conductivity function from a single experiment. The purpose of this research was to evaluate saline water effect on unsaturated hydraulic properties of clay loamy n...

Modern irrigation systems are one of the most important factors affecting crop production, water consumption and productivity, but the performance of these systems requires careful consideration. For this purpose, a study on the effect of surface and subsurface drip irrigation systems with different levels of deficit irrigation on yield, yield comp...

Rice production in northern region of Iran which is strategically and economically very important, requires irrigation management changing with traditional irrigation method (flood irrigation). Plant models that can simulate crop yield in different irrigation management and different conditions will be very beneficial in terms of time and cost. The...

Since rice is one of the most important strategic plants for the country's economy and the people of the north of Iran regions. On the other hand, the problem of soil salinity in some paddy fields there is in the Caspian Sea region due to being located in areas with the saline water table at a very low depth. Therefore, it is necessary to study the...

In this study, the latest version of the AquaCrop model was used to simulate the salt concentration in paddy fields conditions with a shallow and saline water table. This research was performed as a physical model (lysimeter) in the meteorological research center of the campus of agriculture and natural resources, the University of Tehran in 2017-2...

Soil infiltration process is one of the most basic and important parameters in improving the design and management of irrigation systems that accurate estimation will save water consumption in the agricultural sector. Considering that the infiltration measurement process is time-consuming and costly. In this study, an equation was extracted through...

Many applications involving water flow and solute transport in the vadose zone require unsaturated soil hydraulic properties. Direct methods for measuring hydraulic properties are often costly and time consuming. Inverse modeling approach uses information from easily measured data to estimate soil properties which are usually difficult to obtain. T...

نظر به کمبود منابع آب و لزوم بررسي و ارتقاي سيستم هاي آبياري، ضروري است تا نسبت به وضع موجود آنها مطالعاتي صورت گيرد تا بتوان با اتخاذ راهکارهاي مناسب، نسبت به بالا بردن راندمان و بهرهوري آبياري اقدام نمود.انتخاب سيستم آبياري مناسب در هر منطقه از کليديترین و مهمترین مراحل موفقيت طرحهاي آبياري است.

Significant water losses occurred within the Agricultural Water Conveyance, Distribution, and Delivery System in Iranian irrigation districts due to inappropriate operation and maintenance activities. Appropriate agricultural water programming and management need to determine these water losses require costly, time-consuming, and sequential measure...

Efficiency is one of the most important assessment indicators in irrigation systems. Classical efficiency (CE) is not an exact index due to the lack of consideration of the return flows. Therefore, the neoclassical concepts of the efficiency are considered to take a part of losses of irrigation water as a return flow into account. Quality of the re...

This research was used from climate information such as average humidity, average wind speed, soil temperature and salinity of different soil depths (5, 10, 20, 30, 50, and 100 centimeters) in 10 years (2008-2017). The purpose of this study was to investigate the relationship between climate parameters and soil salinity fluctuations. For this purpo...

Due to the issue of water scarcity and drought in Iran, agriculture water management is essential. Agriculture water management requires a policy of correct and efficient use of water, and the smart irrigation system is a suitable and optimal way to use water properly. For this purpose, a moisture sensor device was designed and constructed in Febru...

The meteorological data of 12 synoptic stations of Khuzestan province with a 20-year statistical period (1999-2018) were used to perform the present study. First, using CROPWAT software, the effective rainfall was estimated from three methods USDA, FAO and the developed experimental formula. Using AquaCrop software, real transpiration evaporation o...

Background: Drought is one of the main serious problems for agriculture production which its intensity is increasing in many parts of the world, hence, improving water use efficiency is a main goal for sustainable agriculture. Results: Growth indices including relative shoot length growth (SL), relative stem diameter increase (SD) and relative tru...

Sugarcane is a perennial plant which has four distinct stages of growth, namely germination, tillering, vegetative growth, and maturation. Lack of a reliable model and inadequate image processing equipment analysers lead the sugarcane agro-industries toward yield prediction through manual sampling, which is not only associated with sampling problem...

Due to the time and spatial limitations of subsurface drainage pilots, simulation models have been extensively applied for evaluating these systems. Since the accuracy of simulation models depends enormously on the accuracy of model parameters, this study aims to develop an inverse modeling approach for estimating most influential soil hydraulic an...

In this research, the Drainmod-S model, which is specific for regions with shallow and saline water table, was used for water table changes and salt determination of salt concentration in paddy fields. This research was performed as a physical model (lysimeter) in meteorological research center of college of agriculture and natural resources, unive...

http://press.ut.ac.ir/book_3134.html

«مبانی و شاخص‌های بهره‌وری آب در کشاورزی» عنوان تازه‌ترین گزارشی است که به همت کمیسیون آب، محیط زیست و اقتصاد سبز اتاق ایران تهیه شده است. در این مطالعه یکی از مهم‌ترین و مؤثرترین راهکارهای مقابله با بحران آب، افزایش همزمان کارآیی آبیاری به همراه تخصیص بهینه مقدار آب مصرفی و به‌عبارت‌دیگر افزایش بهره‌وری آب در بخش کشاورزی، معرفی شده است. این گزار...

The problem of soil salinity exists for the paddy field areas in Iran especially, in the margin of Caspian Sea areas, due to its proximity to the sea and low altitude with saline and shallow water table. On the other hand, considering that rice is one of the most important strategic plants for economy of Iran and people in this areas, this research...

Introduction: Different regions have various dust production; and the increase of dust storms illustrates the arid ecosystem dominance in each region. Analyzing and identifying of dust storms and its association with climatic parameters is one of the crucial approaches to reduce the caused damage of this phenomenon. Since besides determining the po...

Disruption in the nitrogen (N) cycle balance has a negative impact on the overall trend of sustainable development, and using soil amendments is necessary to reduce these hazards. This study was carried out as a factorial experiment in a completely randomized design. The treatments consisted of three levels of amendments (0, 7.5 g/kg of pistachio r...

Introduction: With due attention to the limitation of water resources in Iran and specific geographical conditions of the country, using modern methods of irrigation with low water usage is inevitable. By applying suitable management in water system, soil and plant, while increasing product, we can establish a sustainable agriculture. Today, subsur...

Water is the most essential resource for the production of agricultural goods and services. However, high levels of water stress and increased frequency and intensity of droughts, which are mainly driven by climate change dynamics, have reduced the stock of freshwater resources in arid and semi-arid regions, such as Iran. Despite the major reductio...

The problem of soil salinity in some parts of the Caspian Sea region is due to its proximity to the sea and its location in areas with low altitude with shallow and saline water level. On the other hand, considering that rice is one of the most important strategic plants for economy of Iran and people in this areas, this research is necessary in or...

Conventional free subsurface drainage practices in the Moghan Plan, in northwest Iran, result in low irrigation efficiency and excessive volumes of drainage water causing extensive environmental problems. Controlled drainage (CD) is promoted to boost crop yields and reduce subsurface drainage flows and leaching of nutrients. This study was conducte...

Irrigation water scarcity is a major limiting factor in irrigation forming. Hence, trying to optimize the product for less water consumption is reasonable. To determine the optimal amount of irrigation water, the use of empirical-mathematical models and water consumption crop are unavoidable. Nitrogen is an important factor in agricultural producti...

In-depth evaluation and analysis of the error properties associated with satellite-based precipitation estimation algorithms can play an important role in the future development and improvements of these products. This study evaluates the Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN) daily dat...

Subsurface drainage is constructed in the paddy fields with the purpose of drying of land at the time of rice harvest, mid-season drainage and lowering water level after the rice harvest (for autumn and winter crops). Most drainage equations have been developed for non-paddy land. However, given the unique special conditions of paddy fields in Guil...

In rice cultivation, mid-season and end-season drainage at harvest time are two important operations of water management which, respectively, increase yield and provide better conditions for harvesting rice. Due to the unique conditions of paddy fields of Guilan province, making decisions about the spacing and depth of drains and proper equation to...

Subsurface drainage is constructed in the paddy fields with the purpose of drying of land at the time of rice harvest, mid-season drainage and lowering water level after the rice harvest (for autumn and winter crops). Most drainage equations have been developed for non-paddy land. However, given the unique special conditions of paddy fields in Guil...

In rice cultivation, mid-season and end-season drainage at harvest time are two important operations of water management which, respectively, increase yield and provide better conditions for harvesting rice. Due to the unique conditions of paddy fields of Guilan province, making decisions about the spacing and depth of drains and proper equation to...

In this study, the trend of agricultural water consumption was investigated for 22 years (1989-2011) in Iran, considering crop and livestock requirements per capita. Crop and livestock products were categorized into nine groups so that, each group has its particular subgroups. The results of this study showed that the trend of water consumption per...

The aim of this study is to present an inverse modelling approach with a genetic algorithm for estimating soil hydraulic and solute transport parameters in two subsurface drainage systems in Iran. In this study, measured data were obtained from Amirkabir and Shoaybiyeh sugarcane fields equipped with subsurface drainage systems. The SWAP model was u...

There are several mathematical models with different solutions for evaluating surface irrigation; one of these models is SIRMOD. In this study, the evaluation indices were analyzed using SIRMOD. In each study field after pertaining field experiments, factors such as inlet discharge, cutoff time, advance and rollback time, infiltration characteristi...

Paddy fields have the ability of multi-cultivation as compared to other crops. Low permeability rate and long term waterlogging of paddy soils cause serious problems for non-rice crops. Therefore, the aim of this study is to evaluate three different drainage methods including: 1-surface drainage, 2-subsurface pipe drainage and 3-trench drainage (fi...

A second crop in paddy fields has economic advantages resulting from the production of crops (canola, beans, garlic, triticale, soybean, etc.), dry rice bed for mechanized harvesting, strengthening the economy of farmers’ families, increase the incentive for farmers to stay in the village, etc. Due to the inability of the existing surface drainage...

Due to water resources shortage, especially in arid and semiarid region, deficit irrigation is one of main managements for achieving maxi