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Çukurova koşullarında ekim tarihinin ayçiçeği genotiplerinin (Helianthus annuus) verim, bitki su stres indeksi ve su kullanım randımanı üzerine etkileri
(Effect of planting date on yield, plant water stress ındex and water usage rate of sunflower (helianthus annuus) genotypes in semi-arid Cukurova of Turkey )

Author : Ali Beyhan UÇAK  Tugay AYAŞAN Abdullah ÇİL,  
Type :
Printing Year : 2016
Number : 2016-2
Page : 157-165


Summary
Bu çalışmada, 2012 ve 2013 yıllarında Çukurova koşullarında homozigot hale gelmiş (durulmuş) 6 adet ayçiçeği genotipi üzerine ekim tarihinin, bitki su tüketimine, su kullanım etkinliğine ve bitki su stres indeksi ve klorofil içeriği üzerine etkileri araştırılmış ve elde edilen verilerin ışığında sıcak iklim koşullarına en uygun genotip belirlenmeye çalışılmıştır. Vejetasyon süresi boyunca ortalama bitki su tüketimi birinci ekim zamanı denemesinde (567 mm), ikinci ekim zamanı denemesinde (578 mm), uygulanan ortalama sulama suyu miktarı ise birinci ekim zamanı denemesinde ve ikinci ekim zamanı denemesi için (524 mm) olarak belirlenmiştir. Bitki çiçeklenme süresi, fizyolojik olum süresi, bitki su tüketimi (ET), su kullanım randımanı, sulama suyu kullanımı randımanı, klorofilmetre değeri (KO), bitki su stres indeksi (CWSI), 1000 tane ağırlığı ve dane verimi istatistiksel olarak önemli düzeyde değişmiştir. Araştırma sonucunda ekim tarihinin çiçeklenme ve fizyolojik olum süresini farklı şekilde etkilediği belirlenmiş olup, ortalama CWSI değerleri ikinci ekimde en yüksek G1 genotipinde 0.67 ve en düşük de G4-G5 genotiplerinde sırasıyla 0.22 ve 0.27 olarak elde edilmiştir.

Turkish Keywords
Sulama, bitki su stresi indeksi, ekim tarihi, ayçiçeği

Abstract
The aim of this study is to identify the effect of the different sowing dates on the sunflower efficiency and the efficiency of elements, plant water consumption, plant water stress index and water usage rate. The study was conducted to determine the effect of the different planting dates on yield and the yield components of 6 sunflower genotypes in the semi-arid Cukurova region of Turkey, all through the periods of the year 2012 to 2013. In this research, two different planting dates were examined and Evapotranspiration (ET), as the average of two years in the first and second growing seasons was found to be 567 mm and 578 mm, respectively. On at wo years average,the amount of irrigation water was determined as 524 mm. ET, Water Use Efficiency (WUE), Irrigation Water Use Efficiency (IWUE), Chlorophyll Content (CC), Crop Water Stress Index (CWSI), and grain yield were significantly affected. Results showed that thermal stress accelerated flowering and physiological make-up time. The highest CWSI values were determined as 0.67 in genotype No.1 and the lowest values are between genotypes No.4 or No.5,which is given as 0.22 and 0.27 respectively.

Keywords
Irrigation, plant water stress index, sowing dates, sunflower genotypes

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