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Öğe Assessment of the effect of salinity on the early growth stage of the common sunflower (Sanay cultivar) using spectral discrimination techniques(Academic Journals, 2008) Turhan, H.; Genc, L.; Smith, S. E.; Bostanci, Y. B.; Turkmen, O. S.Salinity is one of the main limiting factors for agricultural production. This is especially true in arid and semi-arid regions of the world like Turkey. The objective of this study was to determine if the effect of salt concentration on the physiological and physiological features of the sunflower (Helianthus annuus L) could be measured using remote sensing techniques. Sunflower seedlings were grown under controlled conditions and irrigated with Hoagland Solution containing three different concentrations of NaCl (salt) (0.0, 0.5, 1.0 and 1.5%). The results showed that plant growth decreased proportionally with increasing levels of NaCl. Chlorophyll concentration and a Normalized Difference Vegetation Index (NDVI) were derived for the plants using a spectroradiometer. There was found to be a significant (r(2) = 0.76) correlation between chlorophyll and NDVI values. Therefore, factors that can be derived through remote sensing such as NDVI and chlorophyll can be used to indirectly demonstrate the impact salinity has on sunflower plants. Therefore, agriculturalists can assess growth rate changes caused by salinity using remote sensing techniques.Öğe Çanakkale koşullarında yetiştirilen keten genotiplerinin tohum verimi ve bazı kalite özelliklerinin incelenmesi(2011) Arslan, O.; Kahrıman, F.; Bayram, Ö. Topçu; Turhan, H.Son yıllarda meydana gelen iklimsel değişimler yeni bitki türlerinin tarımsal üretimde yaygınlaştırılmasını zorunlu hale getirmiştir. Bu konuda ülkemizde sınırlı alanlarda yetiştiriciliği yapılan keten önemli bir alternatif ürün olma niteliğindedir. Bu çalışmada sekiz keten genotipinin, tohum verimi, kalite özellikleri ve yaklaşık enerji değerleri bakımından karşılaştırılması amaçlanmıştır. Denemeler 2007 ve 2008 yılında Çanakkale Onsekiz Mart Üniversitesi, Ziraat Fakültesi, Dardanos Araştırma ve Uygulama Birimi’nde tesadüf blokları deneme desenine göre yürütülmüştür. Araştırmada kullanılan genotiplerin tek bitki verimi (g), protein (%), yağ (%), karbonhidrat (%), kül (%) ve kuru madde (%) oranının yanı sıra yaklaşık enerji değerleri (kcal) belirlenmiştir. Araştırma bulgularına göre, tek bitki verimi bakımından Flanders (1,20 g/bitki), yağ oranı bakımından Midin (% 38,6) ve yaklaşık enerji değeri bakımından Norman (454,9 kcal), karbonhidrat ve kül içeriği bakımından McGregor (% 9,62 ve % 4,23) genotipleri diğer genotiplerden üstün bulunmuştur. İncelenen özelliklerden bazıları arasında istatistikî açıdan önemli ilişkiler tespit edilmiş ve en yüksek korelasyon yağ oranı ile toplam enerji değeri arasında (r=0,89) bulunmuştur..Öğe Effects of ecological and topographic conditions on oil content and fatty acid composition in sunflower(2010) Turhan, H.; Citak, N.; Pehlivanoglu, H.; Mengul, Z.Oil concentration and quality in sunflower (Helianthus annuus L.) are very much affected by environmental conditions such as temperature, precipitation, relative humidity, cloudiness and so on. Sunflower oil quality is determined by its fatty acid composition. Therefore, the objective of this study was to investigate the effect of ecological and topographic conditions on oil content and fatty acid composition in a standard sunflower hybrid. The samples were taken from six zones determined according to their ecological and topographical features. The results showed that oil content and fatty acid composition significantly changed by ecological and topographic conditions. Oil content in seeds varied 39.82-44.30% depending on location. Percentages of major fatty acids such as linoleic, oleic, palmitic and stearic acid were also significantly affected by growth location. As a result, environment or growth condition had a significant effect on sunflower oil content and fatty acid composition. Therefore, growth location is an important factor for meeting market requirements of sunflower oil in terms of quality.Öğe EFFECTS OF ECOLOGICAL AND TOPOGRAPHIC CONDITIONS ON OIL CONTENT AND FATTY ACID COMPOSITION IN SUNFLOWER(Scientific Issues Natl Centre Agrarian Sciences, 2010) Turhan, H.; Citak, N.; Pehlivanoglu, H.; Mengul, Z.TURHAN, H., N. CITAK, H. PEHLIVANOGLU and Z. MENGUL, 2010. Effects of ecological and topographic conditions on oil content and fatty acid composition in sunflower. Bulg. J. Agric. Sci., 16: 553-558 Oil concentration and quality in sunflower (Helianthus annuus L.) are very much affected by environmental conditions such as temperature, precipitation, relative humidity, cloudiness and so on. Sunflower oil quality is determined by its fatty acid composition. Therefore, the objective of this study was to investigate the effect of ecological and topographic conditions on oil content and fatty acid composition in a standard sunflower hybrid. The samples were taken from six zones determined according to their ecological and topographical features. The results showed that oil content and fatty acid composition significantly changed by ecological and topographic conditions. Oil content in seeds varied 39.82-44.30% depending on location. Percentages of major fatty acids such as linoleic, oleic, palmitic and stearic acid were also significantly affected by growth location. As a result, environment or growth condition had a significant effect on sunflower oil content and fatty acid composition. Therefore, growth location is an important factor for meeting market requirements of sunflower oil in terms of quality.Öğe In Vitro and in Vivo Water Stress in Sunflower (Helianthus Annuus L.)(2004) Turhan, H.; Baser, I.In this research, we investigated the response of sunflower cultivars to drought stress under both in vitro and in vivo conditions. Murashige and Skoog basal medium supplemented with a range of polyethylene glycol (PEG- 1000) concentrations was used for in vitro drought screening. Results from both in vitro and in vitro experiments showed that plant growth decreased with increasing PEG concentrations. In addition, there were differences between the cultivars in terms of their response to drought. © 2004, by Walter de Gruyter Berlin/Boston. All rights reserved.Öğe Investigation Of Seed Yield And Some Quality Characteristics in Linseed Genotypes Grown in Canakkale Conditions(Univ Namik Kemal, 2011) Arslan, O.; Kahriman, F.; Bayram, O. Topcu; Turhan, H.Recently, global climate changes force to introduce new crop species into agricultural production. For this purpose, linseed, which is gown in a limited area in Turkey, could be an alternative crop. In this study, the aim was to compare eight linseed genotypes for seed yield, quality characteristics and energy values. Experiments were conducted in Canakkale Onsekiz Mart University, Dardanos Experimental Unit during 2007 and 2008 according to randomized block experimental design. In the study, plant yield (g/plant), protein (%), oil (%), carbohydrate (%), ash (%), dry matter (%) and energy value (kcal) were determined. The results showed that Flanders (1.20 g/plant) for plant yield, Midin (38.6%) for oil ratio, Norman (454.9 kcal) for energy value and McGregor (9.62% and 4.23%, respectively) for carbohydrate and ash ratio had advantages compared to the rest of genotypes. Significant relationships among some investigated characters were also detected. The highest correlation coefficient (r=0.89) was found between oil ratio and total energy value.Öğe Öğe Using Chlorophyll Meter to Predict Sunflower Nitrogen Content after Olive Solid Waste Applications(Int Soc Horticultural Science, 2009) Kavdir, Y.; Ilay, R.; Turhan, H.; Genc, L.; Kavdir, I.; Sumer, A.Chlorophyll index is an instantaneous measurement of leaf greenness without the destruction of the plant and a new tool to determine plant nitrogen content and associated yield. A pot experiment was conducted under controlled conditions. Olive solid wastes were mixed with soil at the rates of 0, 3, 5 and 7% with and without additional nitrogen and phosphorous sources. Sunflower was grown in pots for two months. Plant length, leaf number, stem thickness, and chlorophyll meter readings were performed weekly. Plant nitrogen contents and plant weights were determined at harvest. Chlorophyll index and plant nitrogen contents were significantly related (r(2) = 0.86) at the V12 stage. The correlations between chlorophyll meter reading and plant biomass was 0.87 while plant N and plant biomass was 0.96. On the other hand, chlorophyll meter estimation of plant N contents in early stages (V2 and V4) of sunflower growth was not statistically significant. Additions of olive solid waste in the soil reduced chlorophyll meter readings and sunflower biomass.Öğe Vegetation indices as indicators of damage by the sunn pest (Hemiptera: Scutelleridae) to field grown wheat(Academic Journals, 2008) Genc, H.; Genc, L.; Turhan, H.; Smith, S. E.; Nation, J. L.The sunn pest, Eurygaster integriceps Put. ( Hemiptera: Scutelleridae), also known as sting or cereal pest, is one of the most economically important pests of wheat in the world. In this study, a collapsible nylon cloth cage experiments were conducted to determine the feasibility of using remote sensing techniques to detect stress in wheat caused by the density of sunn pests. The results show we can detect the amount of stress in wheat caused by different life stages of sunn pest with a hand-held radiometer. Normalized difference vegetation index (NDVI) based indices; NDVIsg, NDVId, NDVIr, and structure insensitive pigment index ( SIPI) were chosen out of 19 indices initially tested. The NDVI based vegetation indices derived from hyperspectral data, recorded by a hand held spectroradiometer, were used to determine the predicted indices using the initial number of Sunn Pest (NOSP). Overall, r(2) values of all predicted indices calculated for 3(rd) instars were lower than those of 4(th) and adult stage. When r(2) was considered separately, predicted NDVIr index value (87.4) was the highest and predicted SIPI index value is lowest (80.7) in 3(rd) instars. The highest r(2) value was obtained in adult stage of sunn pest is NDVIsg (96.9) compare with NDVId (95.5), NDVIr (92.4) and SIPI (94.2). It was also concluded that remote sensing could detect not only the different stages pest damage on wheat, but also the number of sunn pest stages density affect in controlled experiments.
