Yazar "Cetin O." seçeneğine göre listele

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    An assessment of runoff and sediment in some irrigation districts in a semi-arid region of Turkey
    (Parlar Scientific Publications, 2015) Tari A.F.; Cetin O.; Yolcu R.; Bogdanets V.
    This 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 Qinar-Gflksu, 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 28.02.4% 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.
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    CRITICAL THRESHOLD TEMPERATURES AND RAINFALL IN DECLINING GRAIN YIELD OF DURUM WHEAT (Triticum durum Desf.) DURING CROP DEVELOPMENT STAGES
    (National Agricultural Research and Development Institute, 2022) Cetin O.; Yildirim M.; Akinci C.; Yarosh A.
    The effects of maximum temperature, rainfall and growing degree day on grain yield of durum wheat (Triticum durum Desf.) were studied during the period of available years (2005-2017) in the study sites. A polynomial equation was described the relationship between grain yield, maximum temperature and rainfall for four growing stages of winter wheat. The nonlinear relationships were used from time-series variations in temperatures, rainfall and yields. The maximum positive effects of rainfall (R2=0.72*) on grain yield was in the mid-season stage (heading, anthesis and grain filling) of the crop. However, there was a negative effect of temperature more than 30°C on grain yield. The highest negative effects (R2=0.31 through 0.86*) of maximum temperatures were in the crop development stages (vernalization and tillering). The yield might decrease about 2.5% for every 1°C increase in the growth period based on the daily mean temperature of 12.4°C for all the study locations. The critical maximum temperatures on threshold values declining yield and positive effects of rainfall on grain yield varied according to the altitudes and longitudes. © 2022, National Agricultural Research and Development Institute. All rights reserved.
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    Impacts of boron-affected water in boron-mining catchment area on soiland crops
    (2011) Cetin O.; Uygan D.; Yalcin G.
    This study was carried out to evaluate the impacts of boron (B) pollution and seasonal variation in irrigation water and soils in which Seydisuyu catchment area had boron-mining enterprise of Eskisehir, Turkey from 2002 to 2003. Boron concentration in irrigation water and irrigated soils varied from 0.87 to 3.38 mg 1 -1 and from 0.08 to 3.40 mg kg -1, respectively, depending on stage of the irrigation season, source of irrigation water and soil depth in B-affected irrigation water and Bmining catchment area. In addition, the ranges of levels of boron in leaf tissue of wheat, sugar beet, sunflower, and corn were 15-132, 21-33, 23-93, and 13-37 mg kg -1, respectively. The tolerance limit for boron in water could be 3.38 mg I -1 for tolerant crops in this region.
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    Mapping boron pollution using gis for boron-affected soils in Western Turkey
    (2012) Uygan D.; Cetin O.
    This 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.