Osman ÇOPUR, Davut POLAT, Ceren ODABAŞIOĞLU

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

Anahtar Kelimeler:

Cotton, Sowing Date, Cultivars

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