Dursun Buyuktas

Akdeniz University · Department of Farm Structures and Irrigation

This study aimed to investigate the effects of different irrigation water salinities on the stomatal conductance (gs) and chlorophyll content index (CCI) of tomato plants during different phenological stages, at both pre- and post-irrigation. For this purpose, gs, CCI, and Leaf Area Index (LAI) data were collected from tomato plants grown under fou...

Accurate information regarding crop evapotranspiration (ETc) and its components is essential for proper water management. Salinity has become increasingly serious in many parts of the world, affecting the use of saline water in irrigation for various biochemical processes, hence the importance of understanding the effects of soil and water salinity...

In recent years, subsurface drip irrigation has become increasingly important in view of the increasing drought. As it is a newly developed method, the effects of subsurface drip irrigation (SSDI) and surface drip irrigation (SDI) need to be compared in terms of plant growth and yield parameters as well as water savings. The CWSI is an important in...

In this study, it was aimed to determine the Kc of tomato, eggplant, pepper and cucumber grown in two consecutive seasons in a year in a common type of plastic greenhouse, using the reference (grass) (ETo) and crop evapotranspiration (ETc) values measured directly in lysimeters. The study was carried out at drainage-type lysimeters placed in the gr...

In the Mediterranean region, the expansion of greenhouse horticulture has enabled the year-round supply of fresh vegetables. Compared to open field horticulture, this farming method can generate higher returns for farmers. However, it is often associated with significant environmental pressures. This research aims to pinpoint important opportunitie...

The aim of this study was to determine the effect of deficit irrigation on evapotranspiration, crop water productivity, irrigation water productivity, yield response, yield components and quality characteristics of grain sorghum (Sorghum bicolor L.) grown in Antalya, Turkey. The experiment was carried out in a randomized block design with three rep...

Plant tolerance to salinity stress is vital for irrigation scheduling, decision-making, planning and operation, and water resource management. This study is aimed to investigate the effects of irrigation water salinity on water use, growth, physiology, and yield parameters of drip-irrigated tomatoes in two different growing seasons. In addition to...

The weather reanalysis datasets are very advantageous data types worldwide that fill the gaps of missed measuring data and are alternatives that compensate for the scarcity of observed climate data. The main purpose of this study was to evaluate the effect of horizontal distance, altitude, and climatic regions compared to sea level on NASA POWER re...

Chlorophyll is a significant biochemical component and can be determined in the laboratory (destructive) and using various chlorophyll content measuring devices (non-destructive). In this study, destructive and non-destructive methods were used to determine chlorophyll content and compared in peanut (Arachis hypogaea cv. NC-7) grown under different...

Öz Drenaj, havadar bir bitki kök bölgesi oluşturmak amacıyla fazla suyun çeşitli mühendislik yöntemleriyle toprak yüzeyinden veya kök bölgesinden uzaklaştırılması olarak tanımlanmaktadır. Toprakaltı drenajda hem borulara olan su akışını kolaylaştırmak hem de boru içerisindeki siltasyonu önlemek amacıyla organik ve inorganik zarf malzemeleri yaygın...

Aims: Irrigation water use efficiency is an important issue for both agricultural production and optimization of water resources in arid and semi-arid regions where water resources are limited. Surface drip irrigation (DI) is used in most of these areas. However, subsurface drip irrigation (SDI) has become widespread in recent years. Therefore, the...

Increasing population, pollution of current natural resources, global warming and climate change are increasing pressure on water resources. To maintain the food security of the increasing population, it is essential to increase sustainable agricultural production and to use current limited water resources optimally. In this study, the effect of su...

Drenaj, havadar bir bitki kök bölgesi oluşturmak amacıyla fazla suyun çeşitli mühendislik yöntemleriyle toprak yüzeyinden veya kök bölgesinden uzaklaştırılması olarak tanımlanmaktadır. Toprakaltı drenajda hem borulara olan su akışını kolaylaştırmak hem de boru içerisindeki siltasyonu önlemek amacıyla organik ve organik olmayan zarf malzemeleri kull...

In this study, we investigated the effects of deficit drip irrigation practices on evapotranspiration, water-yield relations, and quality characteristics of two sesame varieties (Muganli-57 and Birkan) grown in the lysimeters under the Mediterranean climate conditions. Irrigation treatments were rainfed (non-irrigated) (I0), drip irrigation with 25...

Leaf area index (LAI) values in plants affect photosynthesis and carbohydrate production directly since it is a measure of photosynthetically active area and the area where transpiration occurs. Leaf area index is an important parameter required to determine plant water consumption by using climatic data and it is especially used in the calculation...

Bu çalışmada, Akdeniz iklim koşullarında yetiştirilen kinoanın su-verim ilişkileri, bitki su tüketimi ve bitki katsayılarının (Kc) belirlenmesi amaçlanmıştır. Araştırma drenaj tipi lizimetre sisteminde, kumlu tın bünyeli toprakta, 2017 yılında, Titicaca (Q-52) kinoa (Chenopodium quinoa Willd.) çeşidinde yürütülmüştür. Araştırmada tam sulama (TS), s...

Bu çalışmada, farklı düzeylerdeki sulama uygulamalarının Akdeniz iklim koşullarında yetiştirilen kinoa bitkisinin vejetatif gelişim, verim ve kalite parametreleri üzerine etkilerinin belirlenmesi amaçlanmıştır. Araştırma drenaj tipi lizimetre sisteminde, kumlu tın bünyeli toprakta, 2017 yılında, Titicaca (Q-52) kinoa (Chenopodium quinoa Willd.) çeş...

The objective of the present study was to determine the effects of different irrigation levels applied with surface drip irrigation (SDI) and subsurface drip irrigation (SSDI) method on yield and bioethanol productivity of sorghum (Sorghum bicolor L. cv. Early Sumac) in the West Mediterranean Region of Turkey. Field study was conducted in Batı Akde...

The use of a mathematical model approach, which is a non-destructive method to determine the leaf area, has been used safely in recent years. The most important reason for this is that the application is easy and the application cost is very low. The most important disadvantage of this method is that the derived models need calibration according to...

The aim of the study was to determine the yield and silage characteristics of maize hybrids (Burak, Efe and Şafak) under different irrigation levels designated as no irrigation (I0), irrigated 25% (I1), 50% (I2), 75% of I4 treatment (I3), and fully-irrigated treatment (I4), irrigated when 40% of available water content consumed, in drainage type ly...

ÖZET Ülkemizde teknik ve ekonomik olarak sulanabilecek arazi miktarı 8.5 milyon ha olarak hesaplanmış ve bu alanın 2019 yılı itibariyle 6.6 milyon ha'lık kısmı sulamaya açılmıştır. 2023 yılına kadar ise 1.9 milyon ha'lık alanın sulamaya açılması hedeflenmektedir. 2018 yılı itibariyle mevcut sulama şebekelerinin %37'sinde klasik, %41'inde kanalet ve...

ÖZET Ülkemizde teknik ve ekonomik olarak sulanabilecek arazi miktarı 8.5 milyon ha olarak hesaplanmış ve bu alanın 2019 yılı itibariyle 6.6 milyon ha'lık kısmı sulamaya açılmıştır. 2023 yılına kadar ise 1.9 milyon ha'lık alanın sulamaya açılması hedeflenmektedir. 2018 yılı itibariyle mevcut sulama şebekelerinin %37'sinde klasik, %41'inde kanalet ve...

In this study, the amount of nitrate leached from the soil and its effects on yield and quality of cucumber plant grown under greenhouse conditions were determined as a result of different fertigation strategies which was formed by changing the application time of the mixture of fertilizer solution during the irrigation cycle. For this purpose, fiv...

Core Ideas Lettuce yield was decreased by excessive nitrogen fertilization. Deficit irrigation did not cause a decrease in yield. Temperatures, photoperiod, and sunshine duration decreased the nitrate accumulation. Nitrogen is one of the most important plant nutrients for lettuce (Lactuca sativa L. var. Kitare). However, excess use of N causes env...

It is estimated that the world population will be 9.6 billion by 2050. In order to meet the food needs of the growing population, it is necessary to increase the yield obtained from existing agricultural land. As the greenhouse provides a more controlled environment, the yield taken from the unit area is higher than the field conditions. For this r...

Evapotranspiration (ET) is one of the most difficult processes in nature. The most accurate and reliable method to determine ET is lysimeter, which is difficult, expensive and time-consuming. On the other hand, ET can be estimated using reference crop evapotranspiration (ETo) and crop coefficient (kc). Determining the amount of evapotranspiration f...

Potato (Solanum tuberosum L.) is one of the most important starch crops grown extensively. In this study, the effects of saline water and proline content on yield and some characteristics of potato were determined. Proline concentrations of 0 mM (control), 10 mM, and 20 mM were applied to potato crop irrigated with water with electrical conductivit...

Due to the climatic changes and the decreasing water resources, it is very important to determine the correct crop water requirement and schedule an appropriate irrigation. FAO methodology based on reference evapotranspiration (ETo) and crop coefficients (kc) is widely used all over the world to determine crop water requirement. For many of the eco...

zet: İnfrared termometre ile ölçülebilen taç sıcaklığı bitki su durumunun bir göstergesi olarak ifade edilmektedir. Taç sıcaklığına dayalı olarak belirlenebilen bitki su stresi indeksi (CWSI) değeri yardımı ile bitki su stresi niceliksel olarak ifade edilmekte ve bu değer sulama programlarının hazırlanması amacıyla kullanılmaktadır. CWSI değeri, Ja...

In order to use current water resources efficiently, plant based irrigation scheduling method among soil, climate and plant based methods is used widely. Infrared thermometers are well developed equipment to measure canopy temperatures for plant based irrigation scheduling. Soybean, which contains 40-45% protein, 18-24% fat and 26% carbohydrate, is...

This research was carried out to determine the effect of drip irrigation strategies on yield and quality characteristics of pomegranate (Punica granatum L. cv. Hicaznar) trees during the growing seasons between 2013 and 2015 years at Batı Akdeniz Agricultural Research Institute in Antalya, Turkey. The amount of irrigation water applied was based on...

Bitki su tüketiminin (ET c) belirlenmesi amacıyla kullanılan lizimetre uygulamaları en doğru ve güvenilir yöntem olmasına karşın deneyimli iş gücü ve uzun zaman gerektirmesi bu yöntemin en önemli dezavantajlarıdır. ET c 'yi belirlemek için dünya çapında en çok kullanılan yöntem kıyas bitki su tüketimi (ET o) ve bitki katsayısına (k c) dayalı FAO me...

Özet Toprak su içeriğinin doğru bir şekilde ölçülmesi sulama ile ilgili çalışmalarda su dengesinin kurulmasında kritik öneme sahiptir. Toprak su içeriğinin belirlenmesinde gravimetrik yöntem en doğru sonucu vermesine karşın zaman alıcı ve iş yükünün fazla olması nedeniyle toprak dielektrik sabitine bağlı farklı nemölçerler geliştirilmiştir. Ancak g...

ABSTRACT Determination of plant water consumption (ET c) is important for water resources management, design of irrigation systems, appropriate irrigation planning and protection of the environment. Determination of ET c by multiplying a comparative plant water consumption (ET o) determined by climatic data in open field conditions with a coefficie...

In this study, it was aimed to determine the temporal and spatial changes of reference crop evapotranspiration (ETo) values in Antalya which has high agricultural potential. For this purpose, climate parameters measured by 20 meteorological stations were selected. 15 out of meteorological stations in the provinces and districts of Antalya were sele...

ZET Nüfus artışına paralel olarak artan besin ihtiyacı, tarımsal alanların şehirleşme ve yanlış arazi kullanımı sonucu azalması ve diğer nedenlerle üretim sonrası yaşanan ürün kayıpları sonucunda her yıl daha fazla bitkisel üretim yapılmasını zorunlu kılmaktadır. Birim alandan elde edilecek ürün miktarını arttırmak için en önemli uygulamaların başı...

Numerous studies have been conducted to determining Reference Evapotranspiration (ETo) in open field conditions but there are a few studies under the greenhouses conditions. Some of the existing studies suggested to use the Penman equation to determine ETo under greenhouse conditions. Computational Fluid Dynamics (CFD) method simulates in greenhous...

Canopy temperature measured via infrared thermometers is an important parameter to determine crop water stress. The crop water stress index (CWSI) is the most often used index based on difference of canopy-air temperature and vapor pressure deficit (VPD) to detect crop water stress and to schedule irrigation for field crops. The aim of this study i...

The main objectives of this study are to assess crop water stress index (CWSI) and to determine irrigation schedule of pomegranate using infrared thermometer technique. Treatments with three replications were irrigated every three and six days intervals, as much as 0.50 (S1), 0.75 (S2), 1.00 (S3), and 1.25 (S4) of Class A pan evaporation. Additiona...

Drought is occurring as a result of global warming in our country and as well as over the world and defined as the precipitation deficit in a certain time period which is lower than that of the normal. It affects negatively all of the living being. Many drought indices have been developed to define the severity and characteristics of drought over t...

This study was carried out to determine the effects of deficit irrigation on evapotranspiration and quality of bermudagrass (Cynodon dactylon L.) turfgrass cultivars under Mediterranean conditions. Eight bermudagrass turf cultivars 'Blackjack', 'Mohawk', 'Princess', 'Riviera', 'Sahara', 'Sultan', 'Swi-1044' and 'Swi-1045' were used. Irrigation expe...

This study was carried out to determine the effect of regular deficit drip irrigation strategies on growth, yield, and yield components, as well as water use efficiency (WUE) under Mediterranean conditions. Peanut (Arachis hypogaea cv. NC-7) crops were grown in the seasons of 2013 and 2014. Irrigation water applications were 0 (I0), 25% (I25), 50%...

The aim of this study is to determine the seasonal water use and water requirements of two sesame varieties (Muganlı-57 and Birkan) irrigated by a drip irrigation system and grown in lysimeter as a second crop, to find out the effects of different deficit irrigation applications on the sesame varieties as well as to determine water-yield relations...

Investigation of canopy temperature and crop water stress index (cwsi) of soybean depending on cultivars. Abstract In order to use current water resources efficiently, plant based irrigation scheduling method among soil, climate and plant based methods is used widely. Infrared thermometers are well developed equipments to measure canopy temperature...

THE EFFECTS OF DIFFERENT FERTIGATION STRATEGIES AND DRIPPER DISCARGE RATES ON NITRATE LEACHING IN SANDY SOILS Abstract This study aims to determine and identify the effects of different fertigation strategies on nitrate leaching in soils having sandy soil texture. To this end, the best time to start and end fertigation during irrigation was determi...

In this study, the effects of different salt sources (CaCl2, NaCl and KCl) and concentrations, as measured by electrical conductivity, (0 "control", 1, 3, 5, 7 and 9 dS m-1) on seed germination and seedling growth of Ferro, Obez, RS 841 and Strong Tosa F1 pumpkin varieties used as rootstock were investigated. The results revealed that germination r...

An experiment was conducted for two years with three replicates in maize crop using three water table dept (90, 120, and 150 cm) and four EC levels (1.7, 3.8, 5.9 ve 10 dS m-1) and a control plot having no water table. It was determined that saline and shallow water table contributed to significant portion of crop water use. The percentage of contr...

Water usage is a vital issue for all agricultural crops as well as for ornamental crops. To obtain high quality flowers, it is essential to supply water when it is required. A problem which is common with cut flower growers are determining when to irrigate and the amount of water to apply. The effect of two irrigation intervals (I 1 : 10 mm pan eva...

This study was carried out in soilless culture to determine the effects of saline irrigation levels on flowering and flower quality of Freesia hybrids planted in a plastic greenhouse located in Bati Akdeniz Agricultural Research Institute between October 2005 and April 2006 under Mediterranean conditions. In the study, three freesia varieties, Ober...

Drainage is necessary for agricultural production in many humid regions of the world, where it is used to improve crop yields and trafficability by removing excess water from the surface and root zone. In arid regions, drainage is often needed to prevent waterlogging and to control salinity in irrigated fields. Water table depths, crops grown in th...

The interest in cut flower cultivation is increasing gradually because of internal market demand, climate advantages of our country and increase on the production of cut flower for export in recent years. 52% of the total cut flower production in Turkey consists of carnation. This study aims to determine the effects of different irrigation levels o...

Soil salinity is one of the limiting factors of agricultural productivity. It is essential to determine the soil salinity in a reliable and yet relatively easy method. This experimental study was carried out to assess the possibilities of measuring electrical conductivity as well as ion concentrations in the extracts of different soil to water rati...

This study was conducted to assess crop water stress index (CWSI) of bermudagrass used widely on the recreational sites of the Mediterranean Region and to study the possibilities of utilization of infrared thermometry to schedule irrigation of bermudagrass. Four different irrigation treatments were examined: 100% (I1), 75% (I2), 50% (I3), and 25% (...

The aim of this study was to determine variations in physical and chemical water quality parameters of the Turkish part of Orontes River, whose basin is shared by Lebanon, Syria and Turkey, between 1984 and 2002. Due to very low amount of surface water in the region, groundwater is densely used for irrigation. In this case, it causes an increase in...

The aim of this study was to determine variations in physical and chemical water quality parameters of the Turkish part of Orontes River, whose basin is shared by Lebanon, Syria and Turkey, between 1984 and 2002. Due to very low amount of surface water in the region, groundwater is densely used for irrigation. In this case, it causes an increase in...

This study was carried out to determine the effects of irrigation on flowering, flower quality and water use efficiency (WUE) of gladiolus (Gladiolus grandiflorus L.) planted in glasshouse in the winter and irrigated by a drip irrigation system under Mediterranean conditions. Two gladiolus varieties, Peter Pears and Eurovision, were used. Three irr...

An enhanced subsurface irrigation hydrology model, developed by Buyuktas & Wallender (Journal of Irrigation and Drainage Engineering, ASCE 128(3): 71–81), is calibrated and validated using 2 years of data collected in a field in Broadview Water District in California, USA. The first year data is used to calibrate the model, while the second year da...

The method of volume averaging is applied to ordered and disordered spatially periodic porous media in two dimensions in order to compute the components of the dispersion tensor for low Peclet numbers ranging from 0.1 to 100. The effect of different parameters on the dispersion tensor is studied. The longitudinal dispersion coefficient decreases wi...

The purpose of this research was to examine the effects of different irrigation levels on evapotranspiration (ET) and quality characteristics of golf-course turfgrasses grown under Mediterranean climatic conditions and to determine the most economical irrigation level which would provide an acceptable turfgrass quality level. Four different irrigat...

In this study, it was aimed at calibrating some amprical equations of grass reference evapotranspiration under field and small lysimeter conditions in Antalya region. In the study, Penman-Monteith and FAO versions of Blaney-Criddle, Radiation, Class A Pan and Penman equations were used in order to compute grass reference evapotranspiration utilizin...

This paper provides a theoretical basis for new features added to the SWMS_3D model of Simunek et al., including spatially varied land use. dynamic root distributions and water uptake, and various fluxes at the soil-atmosphere interface due to different irrigation practices, Spatially varied land use is incorporated into the model by separating ETp...

When numerical models are used for estimating the water flow and solute transport at field scale, modelers are confronted with the issue of spatial variability of soil hydraulic properties. In this paper, the concept of effective soil hydraulic parameters is used to study water and solute transport to tile drains using a three-dimensional determini...