Ceren ODABAŞIOĞLU, Osman ÇOPUR, Davut POLAT

İkinci Ürün Koşullarında Farklı Ekim Zamanlarının Pamuk (Gossypium hirsutum L.) Lif Rengine Etkisi

Lif parlaklığı (Rd) ve lif sarılığı (+b) etkisiyle belirlenen lif rengi (CG), pamuk fiyatını belirleyen önemli özelliklerdir. Bu araştırma, Harran Ovası 2. ürün koşullarında farklı ekim zamanlarında yaygın olarak üretimi yapılan 4 pamuk (Gossypium hirsutum L.) çeşidinde lif rengine olan etkisini belirlemek amacıyla 2014 ve 2015 yıllarında yürütülmüştür. Çalışma, Harran Üniversitesi Ziraat Fakültesi Eyyübiye Kampüsü araştırma alanında, bölünmüş parseller deneme desenine göre; ekim zamanları ana parselleri (1 Haziran, 10 Haziran ve 20 Haziran) ve çeşitler ise alt parselleri (STV-468, BA-119, DP-499 ve PG-2018) oluşturacak şekilde 3 tekerrürlü olarak yürütülmüştür. Denemede kullanılan pamuk çeşitleri bölgemizde tescilli olan çeşitlerdir. Çalışma sonucunda, lif parlaklığı ve lif sarılığının çeşitler ve ekim zamanına göre farklılık göstermekle birlikte, HVI renk skalasına göre tüm çeşitlerin parlak ve beyaz sınıfında yer aldığı, Şanlıurfa iline ait lif renginin, ekim zamanının gecikmesiyle beyaz sınıfa ait standart–2 derecesinden standart 3 ve standart 4 renk aralığına doğru değiştiği saptanmıştır. Denemede kullanılan tüm çeşitlerin lif rengi yönünden ekim zamanlarından etkilendiği ve ekimin gecikmesiyle rengin hafif matlaştığı, bu amaçla, erken ve geç ekilen pamukların birbirine karıştırılmaması ve farklı depolarda depolanması gerektiği saptanmıştır.

Effect of Different Sowing Dates on Cotton (Gossypium hirsutum L.) Fiber Color at Double Crop Growing Conditions

Cotton fiber color is determined by the effect of fiber reflectance (Rd) and fiber yellowness (+b), whichare important standards for determining cotton price. This study was conducted to determine effects ofdifferent sowing times on fiber color components in widely grown four cotton (Gossypium hirsutum L.)varieties in 2015 and 2016 under Harran Plain double crop conditions. The experiments were conductedon the experimental area of Agricultural Faculty of Harran University at Eyyübiye Campus. Seeds ofcotton cultivars were sown according to sowing dates with completely randomized split plotexperimental design with three replications. Sowing dates (June 1st, June 10th and June 20th) were keptin main plot and varieties (Stoneville 468, BA 119, DP 499 and PG 2018) were in sub plot. Four cottonvarieties (Stoneville 468, BA 119, DP 499 and PG 2018), which are certified for Harran Plain, were usedas plant material. As the result of the study, the fiber color of Şanlıurfa province, where all varieties arein the light and white class according to the HVI color scale, but white color is changing from standard 2to standard 3 and standard 4 grade. All the varieties used in the experiment were affected by sowingtime in terms of fiber color and whiteness of color was found to be dulled with the delay in the sowingtime. For this reason, early and late harvests should not be mixed and should be stored separately.

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