Yazar "Cetin, Oner" seçeneğine göre listele
Listeleniyor 1 - 12 / 12
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe ADAPTATION STRATEGIES TO CLIMATE CHANGE WITH SUSTAINABLE IRRIGATION(Univ Agronomic Sciences & Veterinary Medicine Bucharest - Usamv, 2023) Cetin, Oner; Doganay, Kivanc Hayri; Bezdan, JovanaGlobal warming and climate change are the biggest problems of the world today. Agricultural irrigation plays a very important role in both increasing production and reducing the potential risk of drought. However, excessive use of water in agriculture (>10 000 m(3) ha(-1)), very low irrigation efficiency (35-50%) and the effect of climate change cause a rapid decrease in water resources.In adaptation to climate change, efficient use of water resources in agricultural production, irrigation water productivity (kg m(-3)), economic productivity of water ($ m(-3)), farmers' net income ($ ha(-1)) and total water use (m(3)ha(-1)) should be considered for each irrigated area. Thus, both the farmers, the irrigation authority and the decision makers can choose to implement possible deficit irrigation strategies and/or the most effective water use strategies according to these parameters. Thus, the main categories might be identified under the sustainable resource management, water management, technological developments, farm management, and farm production practices. Adaptation strategies to climate change can be implemented, but the costs and benefits of these practices need to be well understood.Öğe APPLICATION TECHNIQUES OF FERTIGATION(Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2013) Cetin, Oner; Uzen, Nese; Karaer, MuratAdvances in micro-irrigation techniques have facilitated greater adoption of the application of fertilizers to crops through irrigation water; the technique is termed as fertigation. Fertigation is used extensively in commercial agriculture and horticulture and is starting to be used in general landscape applications as dispenser units become more reliable and easy to use. Some irrigation systems offer the ability to use high-frequency fertigation likes drip irrigation systems. Irrigation and fertigation system design, soil type, crop stage, chemical type, fertigation time and irrigation water quality are important parameters for an appropriate fertigation. Fertilizer application techniques are also an important factor in achieving success. All techniques for incorporating a chemical with the irrigation water create a specific level of chemical concentration during irrigation. The various techniques may be classified into three main groups. These are; (i) gradual decrease of chemical concentration, (ii) constant level of chemical concentration, (iii) intermittent chemical concentration. In this article, the methods and equipments of fertigation and some research results of the fertigation frequencies on crops are presented.Öğe Assesment of water productivity using different drip irrigation systems for cotton(Elsevier, 2019) Cetin, Oner; Kara, AbdurrahmanThe aim of this study is to evaluate water productivity (WP), economic water productivity (EWP) and land economic productivity (LEP) using different amount of irrigation water and different drip irrigation (surface drip irrigation, SDI) and subsurface drip irrigation, SSDI) for cotton. For that, the results of the experiment carried out in cotton growing season of 2016 and 2017 were evaluated. The maximum WPIrrig (0.84 kg m(-3)) occurred in the SSDI system at the lateral pipe depth of 40 cm. However, the net LEP (US$1109.9 ha(-1)) was in which the irrigation application (551.3 mm) had a calculated crop water requirement of 1.00 times using Penman-Monteith method. The maximum EWP (US$0.19 m(-3)) occurred also in the SSDI system with the lateral pipe depth of 40 cm. SSDI under the depth of 40 cm resulted in reducing water use and greater water productivity using an amount of irrigation water based on 1.0xCrop water requirement. Thus, this treatment was found to be more applicable in terms of farmer practices. WPIng, WP, EWP and LEP should be considered jointly for an optimization of water productivity and water saving in terms of farmers and irrigation schemes.Öğe AN ASSESSMENT OF RUNOFF AND SEDIMENT IN SOME IRRIGATION DISTRICTS IN A SEMI-ARID REGION OF TURKEY(Parlar Scientific Publications (P S P), 2015) Tari, Ali Fuat; Cetin, Oner; Yolcu, Ramazan; Bogdanets, VyacheslavThis study was carried out to assess runoff and mass sediment (soil losses) from 3 irrigation districts in the southeastern Anatolia Region of Turkey in 2005 and 2006. The total irrigating area was 3582 ha, 10044 ha, and 4758 ha for Cinar-Goksu, Devegecidi, and Kralkizi Districts, respectively. The numbers of samples in the irrigation districts for measurement of runoff and sediment ranged from 2 to 9 depending on the exit of these districts. A volumetric cup was used for discharge of runoff based on time. To estimate sediment in the runoff, water samples were collected using a 1-liter bottle. The total soil loss was estimated using the amount of soil mass lost with runoff per second and per liter. Runoff and mass sediment losses from these irrigation districts ranged from 28.0-42.4% and 98.4-4503.6 tons for one irrigation season, respectively. The reasons for excess runoff and mass sediment might be attributed to excessive flooding of lands and inappropriate irrigation methods. These runoff and soil losses are not acceptable for sustainable irrigation and environmental pollution, and these losses were affected by size of irrigation districts, land slopes, crop pattern, irrigation methods, amount of irrigation water applied, and climatic conditions.Öğe Effects of climatic factors on cotton production in semi-arid regions - A review(Gaurav Soc Agricultural Research Information Centre-Aric, 2010) Cetin, Oner; Basbag, SemaCotton is the world's most important fiber crop and the second most important oil seed crop. Fruiting of cotton plant is determined and influenced by cultivars, climatic conditions, management practices and pests. Climatic factors such as temperature, wind, rainfall and relative humidity significantly affect the boll production of cotton. High temperature, especially more than 30 degrees C, reduces the boll retention and thus final yield. Strong winds may also reduce the yield due to boll shedding. Likewise continuous rain during flowering and boll opening will impair the pollination and may thus reduce fiber quality. However, increasing amount of rainfall in early growing period of cotton can result in higher yield. In addition, the water requirement of cotton depends on climate and length of the total growing period. In this paper, effects of climatic factors on cotton yield in semi-arid regions are evaluated and discussed based. on carried out some currently studies.Öğe Effects of domestic wastewater treated by anaerobic stabilization on soil pollution, plant nutrition, and cotton crop yield(Springer, 2016) Uzen, Nese; Cetin, Oner; Unlu, MustafaThis study has aimed to determine the effects of treated wastewater on cotton yield and soil pollution in Southeastern Anatolia Region of Turkey during 2011 and 2012. The treated wastewater was provided from the reservoir operated as anaerobic stabilization. After treatment, suspended solids (28-60 mg/l), biological oxygen demand (29-30 mg/l), and chemical oxygen demand (71-112 mg/l) decreased significantly compared to those in the wastewater. There was no heavy metal pollution in the water used. There were no significant amounts of coliform bacteria, fecal coliform, and Escherichia coli compared to untreated wastewater. The cottonseed yield (31.8 g/plant) in the tanks where no commercial fertilizers were applied was considerably higher compared to the yield (17.2 g/plant) in the fertilized tanks where a common nitrogenous fertilizer was utilized. There were no significant differences between the values of soil pH. Soil electrical conductivity (EC) after the experiment increased from 0.8-1.0 to 0.9-1.8 dS/m. Heavy metal pollution did not occur in the soil and plants, because there were no heavy metals in the treated wastewater. It can be concluded that treated domestic wastewater could be used to grow in a controlled manner crops, such as cotton, that would not be used directly as human nutrients.Öğe Effects of nitrogen fertigation frequency on yield and nitrogen retention in drip-irrigated cotton(Taylor & Francis Inc, 2016) Uzen, Nese; Cetin, OnerFertigation techniques have been widely used in drip-irrigated cotton. The timing of nitrogen (N) fertilizer injections then becomes a management question producers need guidance on. This study investigated the effect of nitrogen (N) fertigation frequency on drip-irrigated cotton. Experiments were conducted in the Southeastern Anatolia Region of Turkey in 2011 and 2012. A split-plot experimental design was applied. The main plots contained two different lateral spaces: A, one drip-line (lateral) per row; and B, one lateral for every two rows. Sub-plots were designed with different frequencies of fertigation as follows: a, the application of fixed amount of N at each irrigation cycle (5days); b, the application of fixed amount of N every two irrigation cycles (10days); and c, the application of one-fifth of the total N between the first irrigation and first flowering, two-fifths between the first flowering and formation of the first boll, and one-fifth between the formation of the first boll and last irrigation cycle. One-fifth of the total N was applied to the soil at sowing in all treatment regimens. The maximum cotton yield (4120kg ha(-1)) and highest total N content (2.57-2.94%) in the leaves were obtained with one lateral for every two rows and the application of fixed amount of N every two irrigation cycles (10days). One-fifth of the total N might be applied to the soil at sowing, and the remaining N should be applied in equal doses (an average of 7 fertigations) every two irrigation cycles (10days) by fertigation. However, further research fertigation methods for cotton, including the amount of N that needs to be applied and the use of different injection systems, is required.Öğe EVALUATION OF DEVEGECIDI IRRIGATION SCHEME ON THE IRRIGATION MANAGEMENT IN SOUTHEASTERN ANATOLIA REGION OF TURKEY(Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2013) Uzen, Nese; Yolcu, Ramazan; Cetin, OnerSome of the irrigation schemes in Turkey have three main problems in terms of irrigation management and operation. These are (a) inequality on water distribution to the farmers, (b) no obtaining the appropriate benefits from the irrigation projects or irrigation schemes since the inadequacy on irrigation management and (c) insufficient on maintenance of the irrigation schemes. The irrigation schemes in Turkey were operated by the government sector (DSI, State Hydraulic Works) up to 1994. After then, DSI has transferred the irrigation schemes to the Water User Associations (WUA). Devegecidi Irrigation Scheme located in Southeastern Anatolia Region of Turkey receives irrigation water from Devegecidi Dam. Total project area is 10044 ha however 6900 ha of this area is planned to irrigate. On the other hand, although cotton was planned as 13%, the realized rate of cotton area was ranged from 12% through 97% according to the years. The mainly cultivated crops are cotton, cereals and vegetables. The capacity of the main conveyor canal is 9 m(3)/s. The practically irrigated area was ranged from 4250 ha through 5800 ha depending on years. Some farmers do not irrigate the fields because of fallow and the lack of maintenance on irrigation schemes. Some farmers can not get the water because the fields are the far to the irrigation schemes or water can not be reached to the end of the scheme. In addition the over irrigation is another problem. The irrigation methods are border (75 %), furrow (17%) and sprinkler irrigation (8%). Although the water which is flowed to the scheme is measured, it is not measured at the distribution points in the fields. Approximately 31% of the total water are surface runoff. The main problems in the irrigation scheme are inappropriate institutionalization, no measuring water and no applying the penalties to the farmers. All these cause over irrigation and lower irrigation performances. In this article, the main problems on irrigation management and operation are discussed and some critical solutions are also presented.Öğe EVALUATION OF PHYSICAL AND ECONOMICAL WATER USE INDICES IN TWO IRRIGATION SCHEMES IN SOUTHEASTERN ANATOLIA REGION OF TURKEY(Parlar Scientific Publications (P S P), 2016) Uzen, Nese; Cetin, OnerIn this study, some physical and economical water use indices (WUI) were evaluated and discussed in two different irrigation schemes. Data were collected from Devegecidi and P2 Irrigation Schemes in Southeastern Anatolia Region of Turkey for two irrigation seasons, 2013 and 2014. In physical WUIs,total water use efficiency was projected as 54 % for delivering water to the irrigation schemes; those were 20.6-28.8 % and 36.9-43.1 % in Devegecidi and P2, respectively. Water supply and physical water productivity (WP) in weighted mean were 1.90-2.62, 1.26-1.46 and 0.314-0.318 kg m(-3), 0.477-0.495 kg m(-3) in Devegeicidi and P2, respectively. Water charges are based on crop type and per irrigated area in the irrigation schemes as it has been in all the other irrigation schemes in Turkey. In economical WUIs, net return per unit area were $548-570 ha(-1) and $663-790 ha(-1) in Devegecidi and P2 depending on the growing seasons, respectively. Expected irrigation economic WUI or expected net return per the gross applied volumetric water varied from $0.069 m(-3) through $0.088 m(-3). However, realized net production economic WUI or net return per the diverted volumetric water to the irrigation schemes varied from $0.033 m(-3) through $0.059 m(-3). The main problems in the irrigation schemes were lack of measuring irrigation water used in the fields, an appropriate irrigation scheduling and any sanction for the farmers used over irrigation and institutional approaches on WUAs management. The irrigation schemes must be urgently improved in terms of operation and management, and water charges based on volumetric measurement.Öğe MAPPING BORON POLLUTION USING GIS FOR BORON-AFFECTED SOILS IN WESTERN TURKEY(Carpathian Assoc Environment and Earth Sciences, 2012) Uygan, Demet; Cetin, OnerThis study was aimed to assess status of boron pollution, identification of agricultural soils at risk in Seydisuyu Watershed of Western Turkey, which has rich B deposits. The maps of borom pollution for the soils were produced using GIS. Boron concentrations in the irrigated soils varied widely, from 0.08 to 3.40 mg kg(-1) depending on the sampled fields and soil depths. The highest boron concentration was found in the top layer of soil (0-30 cm) for all sampled fields. This revealed that the top layer of soil was most affected by accumulation of boron. However, there is no excessive boron pollution especially in terms of crops. Thus, decision makers, irrigators and farmers could be used these boron pollution maps for appropriate irrigation and soil management.Öğe SUSTAINABLE STRATEGIES ON IRRIGATION MANAGEMENT FOR IRRIGATED MAIN FIELD CROPS (WINTER WHEAT, COTTON, CORN) IN GAP REGION OF TURKEY(Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2018) Cetin, Oner; Uzen, NeseTo get an appropriate yield and production for winter wheat, it must be irrigated. Cotton and corn must be almost irrigated in the regions grown. Amount of irrigation water of 4000-4500 m(3) ha(-1) need for optimum wheat production. More than 50% of the country's cotton production is in Southeastern Anatolia Region of Turkey and cotton need amount of irrigation water approximately 10000 m(3) ha(-1) for an appropriate production using surface irrigation methods. However, the amount of irrigation water of 5 000-6 000 m(3) ha(-1) is enough if modern irrigation technologies such as drip irrigation are used. Similarly, amount of irrigation water more than 10000 m(3) ha(-1) has been used for corn production under the surface irrigation conditions and it is possible to save nearly 40-50% of water using drip irrigation method in the same region. One of the most important ways of ensuring sustainability of irrigated agriculture is to use micro irrigation, and it may help in saving significant amount of water and increase the quality and quantity of produce. Thus, it is possible to achieve both higher water productivity and higher yield by means of drip irrigation.Öğe Tomato irrigation scheduling improved by using percent canopy cover and crop developmental stage(Csiro Publishing, 2008) Cetin, Oner; Uygan, Demet; Boyaci, HasanThe aim of this study was to evaluate whether it is possible to conserve water and improve yield using canopy cover in order to adjust the amount of water needed for drip-irrigated tomatoes. The experiments were carried out using field-grown tomatoes (Lycopercion esculentum cv. Dual Large, F1) in Central Anatolia, Turkey from 2003 to 2005. The experimental design used split-plots in randomised blocks with 3 replications. The main plots in this study were: I-1, constant Class A pan evaporation (Ep) (i.e. K = 1.0) throughout the irrigation season; I-2, varying Ep proportion according to crop development stage (i.e. planting time to. owering stage 0.50; flowering stage to first harvesting 1.0; and first harvest to last harvest 0.75. In subplots, wetted area percentages or canopy cover were used. In K-1, the wetted area percentage measured 90% of the experimental site. In K-2, the wetted area percentage varied depending on the canopy cover. In K-3, the percentage of wetted area was set to a value of 65% throughout the irrigation season. The maximum yield of 134.8 t/ha was obtained with the I2K2 treatment, with a seasonal irrigation requirement of 515 mm. A tomato yield of 122.8 t/ha was obtained under conditions of 552 mm seasonal irrigation water applied using the I1K2 treatment. Although 37mm less water was used in the I2K2 treatment, the yield obtained from that treatment was higher by 12.0 t/ha than the I1K2 treatment. In addition, the yield with all other treatments was lower than the I2K2 treatment. Similarly, the maximum irrigation water-use efficiency (IWUE) of 26.2 kg/m(3) was obtained with the I2K2 treatment. Thus, use of different coefficients of Ep varying with crop growth stages and percentage of canopy cover to estimate irrigation water requirement (i.e. irrigation scheduling) maximised the yield of tomatoes and improved the IWUE.
