Yazar "Demirel, K." seçeneğine göre listele

Listeleniyor 1 - 9 / 9
  • [ X ]
    Öğe
    Assessment of Water Stress Using Chlorophyll Readings and Leaf Water Content for Watermelon
    (Univ Namik Kemal, 2010) Demirel, K.; Genc, L.; Camoglu, G.; Asik, S.
    The objective of this study was to determine plant water stress using Chlorophyll Readings (ChRs) and Leaf Water Content (LWC) measurements for watermelon in the Canakkale region of western Turkey. ChRs and LWC were measured before (BI) and after irrigation (AI). Six different irrigation treatments (S-100, (control), S-80, S-60 S-40, S-20 and S-0 (non-irrigated)) were applied with drip irrigation. Growth stages were divided into three categories: (1) flowering (F), (2) fruit growth (FG) and (3) ripening and harvest (RH). ChRs and LWC for both irrigation treatments and all growing stages were calculated by means of ANOVA using SPSS for Windows statistical software. It was seen that ChRs and LWC decreased from S-100 to S-0 during growth period. The coefficient of determination (R-2) and linear equation between ChRs and LWC for F, FG and RH stages were found to be 0.751, 0.805 and 0.878, respectively. Result of this study has shown that LWC and ChRs measurements can be used to determine water stress especially F period and the beginning FG periods.
  • [ X ]
    Öğe
    Does Application of Water Retention Barrier to Soil Increase Salt Content Within Soil Profile?
    (Univ Namik Kemal, 2012) Demirel, K.; Kavdir, Y.
    In thi s research, effects of water retention barrier (WRB) that was placed under effective rooting depth of turfgrass, on change of electrical conductivity and soil pH were investigated in Canakkale-Ezine in 2010 and 2011. Treatments were WRB application depths (30 cm and 40 cm) and three different i rrigation levels were applied for each depth. In this study, EC and pH were analyzed by taking soil samples at twice a year. According to the results, application of WRB on sandy soil does not significantly changed soil EC and pH values for two years.
  • [ X ]
    Öğe
    Effects of Different Irrigation Levels On Pepper (Capsicum Annum Cv. Kapija) Yield And Quality Parameters in Semi-Arid Conditions
    (Univ Namik Kemal, 2012) Demirel, K.; Genc, L.; Sacan, M.
    The effects of different irrigation levels on yield, quality parameters, evapotranspiration, water use efficiency, and irrigation water use efficiency were investigated for pepper (Capsicum Annum Cv. Kapija) plant grown in semi-arid region. The Research was carried out in 2009-2010 years in Canakkale province. Drip irrigation method was applied to irrigate the experimental plots with 4 different irrigation levels (10, 166, 133 and 1100). Total irrigation water amounts ranged from 30 to 567 mm in 2009 and from 62 to 489 mm in 2010 were applied according the treatments. Average seasonal evapotranspiration (ETa) were calculated between 322-796 mm with respect to treatments. Pepper yield were obtained 10.89-44.92 and 4.47-63.64 t ha(-1) in 2009 and 2010, respectively. With respect to irrigation levels, average water use efficiency (WUE), irrigation water use efficiency (IWUE) were changed between 2.36-6.95 kg m(-3) and 0-9.05 kg m(-3), respectively. Average yield response factor (ky) was found 1.468. While considering the both 2009 and 2010 years, differences between quality parameters of irrigation treatments (mean fruit weight, fruit width, fruit lenght, fruit thickness and water soluable dry matter) except pH, were statistically significant (p<0.05).
  • [ X ]
    Öğe
    Effects of different irrigation levels on pepper (Capsicum Annum Cv. Kapija) yield and quality parameters in semi-arid conditions
    (2012) Demirel, K.; Genç, L.; Saçan, M.
    Yarı kurak iklim bölgesinde yetiştirilen biberin (Capsicum Annum Cv. Kapija) farklı sulama uygulamalarının verime, kalite parametrelerine, bitki su tüketimine, su kullanım randımanına ve sulama suyu kullanım randımanına etkileri araştırılmıştır. Araştırma 2009-2010 yıllarında Çanakkale yöresinde yürütülmüştür. Deneme parselleri damla sulama yöntemine göre sulanmış ve 4 farklı sulama konusu $(S_0, S_{33},S _{66} ve S_{100})$ oluşturulmuştur. Konulara göre; toplam sulama suyu miktarı (I) denemenin ilk yılında 30-567 mm, ikinci yılında ise 62-489 mm uygulanmıştır. Ortalama mevsimlik bitki su tüketimi (ETa) konulara göre 322-796 mm arasında değişmiştir. Biber verimi, konulara göre 2009 ve 2010 yıllarında sırasıyla, 10.89-44.92 ve 4.47-63.64 t $ha^{-1}$ arasında gerçekleşmiştir. Sulama konularına göre ortalama su kullanım randımanı (WUE), sulama suyu kullanım randımanı (IWUE) sırasıyla $2.36-6.95 kg{m-^3}$ ve $0-9.05kg {m-^3}$ arasında değişmiştir. Ortalama verim tepki etmeni (ky) 1.468 bulunmuştur. İki yıl birden dikkate alındığında, pH dışındaki kalite parametrelerinde (tek meyve ağırlığı, meyve çapı, meyve boyu, meyve eti kalınlığı ve suda çözünür kuru madde miktarı) konulara göre farklılık istatistiksel olarak önemli (p<0.05) bulunmuştur.
  • [ X ]
    Öğe
    Karpuz bitkisinde yaprak su içeriği ve klorofil okumalarından yararlanılarak su stresinin belirlenmesi
    (2010) Demirel, K.; Genç, L.; Çamoğlu, G.; Aşık, Ş.
    Bu çalışmada, Türkiye’nin batısında Çanakkale Bölgesinde karpuz bitkisi için klorofil okumaları ve yaprak su içeriği ölçümlerinden yararlanılarak bitkideki su stresinin belirlenmesi amaçlanmıştır. Klorofil okumaları (KO) ve yaprak su içeriği (YSİ) sulama öncesi (SÖ) ve sulama sonrası (SS) ölçülmüştür. Sulamalar damla sulama yöntemi ile yapılmış ve 6 farklı sulama konusu (S100, (kontrol), S80, S60 S40, S20 ve S0 (susuz)) oluşturulmuştur. Büyüme dönemleri 3 kategoriye ayrılmıştır: (1) çiçeklenme (Ç), (2) meyve oluşumu (MO), (3) olgunlaşma ve hasat (OH). Gelişme dönemleri ve sulama uygulamalarında yaprak su içeriği ve klorofil okuma değerleri arasındaki ilişkiler, SPSS istatistik paket programı kullanılarak ANOVA analizi yardımıyla belirlenmiştir. Gelişme dönemi boyunca klorofil okumaları ve yaprak su içerikleri S100 konusundan S0 konusuna doğru azalmıştır. Çiçeklenme dönemi, meyve oluşumu dönemi, olgunlaşma ve hasat dönemleri için klorofil okumaları ve yaprak su içerikleri arasındaki ilişkilerin belirtme katsayıları (R2) sırasıyla 0.751, 0.805, 0.878 olarak bulunmuştur. Araştırma sonuçları, yaprak su içeriğinin ve klorofil okumalarının özellikle çiçeklenme dönemi ve meyve oluşum döneminin başlangıcında su stresini belirlemek için kullanılabileceğini göstermiştir.
  • [ X ]
    Öğe
    Radiation Use Efficiency and Yield of Pepper (Capsicum annuum L. cv. California Wonder) under Different Irrigation Treatments
    (Tarbiat Modares Univ, 2017) Yildirim, M.; Demirel, K.; Bahar, E.
    This study assessed the optimum water need of pepper (Capsicum annuum L. cv. California Wonder) and the critical irrigation level to be applied in order to achieve a reasonable economic yield in water shortage conditions. In a controlled field experiment involving five different treatments, seasonal evapotranspiration for pepper fluctuated from 89 mm in the severe stress treatment (I-0.00) to 1,018 mm in the excess water application (I-1.25). The highest yield was obtained in the full treatment where water in the root zone was refilled up to field capacity. In cases of water shortage, applying water of 690 mm ensures an economical yield. Maximum leaf area index was recorded in the full treatment (I-1.00), which enabled the pepper to receive more benefit from total incoming solar radiation (average, 2,387 MJ m(-2)). An average of 555.45 MJ m(-2) was held by the pepper canopy throughout the whole growing season. Radiation use efficiency values on a dry yield basis were 0.69 g MJ(-1) in 2011 and reached 1.07 g MJ(-1) in 2012, since the leaf area index increased from 1.46 to 2.44. Therefore, averaged over two years, the peppers in the full treatment converted irrigation water of 888 mm and intercepted photosynthetically active radiation into the highest yield of 75.5 t ha(-1), which was more efficient than the excess and deficit water application treatments.
  • [ X ]
    Öğe
    Radiation use efficiency and yield of pepper (Capsicum annuum L. cv. California wonder) under different irrigation treatments
    (Tarbiat Modares University, 2017) Yildirim, M.; Demirel, K.; Bahar, E.
    This study assessed the optimum water need of pepper (Capsicum annuum L. cv. California Wonder) and the critical irrigation level to be applied in order to achieve a reasonable economic yield in water shortage conditions. In a controlled field experiment involving five different treatments, seasonal evapotranspiration for pepper fluctuated from 89 mm in the severe stress treatment (I0.00) to 1,018 mm in the excess water application (I1.25). The highest yield was obtained in the full treatment where water in the root zone was refilled up to field capacity. In cases of water shortage, applying water of 690 mm ensures an economical yield. Maximum leaf area index was recorded in the full treatment (I1.00), which enabled the pepper to receive more benefit from total incoming solar radiation (average, 2,387 MJ m-2). An average of 555.45 MJ m-2 was held by the pepper canopy throughout the whole growing season. Radiation use efficiency values on a dry yield basis were 0.69 g MJ-1 in 2011 and reached 1.07 g MJ-1 in 2012, since the leaf area index increased from 1.46 to 2.44. Therefore, averaged over two years, the peppers in the full treatment converted irrigation water of 888 mm and intercepted photosynthetically active radiation into the highest yield of 75.5 t ha-1, which was more efficient than the excess and deficit water application treatments. © 2017, Tarbiat Modares University. All rights reserved.
  • [ X ]
    Öğe
    Toprak altına serilen su tutma bariyer uygulamaları toprak profilindeki tuz içeriğini arttırır mı?
    (2012) Demirel, K.; Kavdır, Y.
    Bu çalışmada, 2010 ve 2011 yıllarında Çanakkale ili Ezine ilçesinde yaz döneminde çim bitkisinin etkili kök derinliği altına serilen SuTutma Bariyerlerinin (STB) toprak profili içerisindeki elektriksel iletkenlik (EC) ve toprak reaksiyonu (pH) değişimi üzerine etkileri araştırılmıştır. Denemede, 30 cm ve 40 cm olmak üzere iki farklı STB derinliği kullanılmış ve her bir derinlik için üç farklı s ulama suyu düzeyi uygulanmıştır. Çalışmada, deneme yıllarında farklı zamanlarda konulardan alınan toprak örneklerinde EC ve pH analizleri yapılmıştır. Elde edilen sonuçlara göre, iki yıl boyunca kumlu topraklarda STB uygulaması toprak EC ve pH değerlerini önemli olarak değiştirmemiştir.
  • [ X ]
    Öğe
    Using Leaf Based Hyperspectral Models for Monitoring Biochemical Constituents and Plant Phenotyping in Maize
    (Tarbiat Modares Univ, 2016) Kahriman, F.; Demirel, K.; Inalpulat, M.; Egesel, C. O.; Genc, L.
    The aim of this study was to develop and validate qualitative and quantitative models to discriminate different types of maize and also estimate biochemical constituents. Spectral data were taken from the central leaf of randomly-chosen plants grown in field trials in 2011 and 2012. Leaf chlorophyll and protein content and stalk protein content were determined in the same plants. Four different Support Vector Machine (SVM) models were generated and validated in this study. In qualitative models, maize type was designated as dependent variable while Full Spectral (FS) data (400-1,000 nm) and Spectral Indices (SI) data (34 indices/bands) were independent variables. In the two quantitative models (SVMR-FS and SVMR-SI), independent variables were the same, whereas dependent variables were assigned as the quantitatively measured traits. Results showed the qualitative models to be a robust method of classification for distinguishing different maize types, such as High Oil Maize (HOM), High Protein Maize (HPM) and standard (NORMAL) maize genotypes. The SVMC-FS model was superior to SVMC-SI in terms of the genotypic classification of maize plants. Quantitative models with full spectral data gave more robust prediction than the others. The best prediction result (RMSEC=222.4 mu g g(-1), R-2 for Cal=0.739, SEP=213.3 mu g g(-1); RPD=2.04 and r=0.877) was obtained from the SVMR-FS model developed for chlorophyll content. Indirect estimation models, based on relationships between leaf-based spectral measurements and leaf and stalk protein content, were less satisfactory.