This study was aimed to assess the effect of defoliant application on yield and yield components of some cotton cultivars at timely and late sowing under Harran Plain conditions in 2017 and 2018 growing seasons. Field trials were arranged employing randomized blocks split-split plots design with 3 replications. In the study, sowing times (i.e.10 th of May and 10 th of June) consisted the main plots, cultivars (i.e. Candia and Lima) placed in the sub-plots and defoliant applications (i.e. Control and Dropp Ultra (600 ml ha -1 )) were in the sub-subplots. Each plot was sown with a length of 12 m and 6 rows, with a 70 cm inter-row and 15 cm intra-row spacing. In the trials, the defoliant chemical called Dropp Ultra (i.e.120 g Thidiazuron + 60 g Diuron) was used. The application was practiced when the 60 % of boll opened. It was found that Candia and Lima cotton cultivars sown timely gave seed cotton yields of 5296.7 and 5073.3 kg ha -1 respectively, whereas at late sowing gave the seed cotton yields of 4672.5 kg ha -1 and 4545.8 kg ha -1 in 2017 and 2018; Candia gave the higher seed cotton yield (i.e. 5179.2 in 2017 and 5013.3 kg ha -1 in 2018) than Lima cultivar (i.e. 4790.0 in 2017 and 4605.8 kg ha -1 in 2018) in both years. Results indicated that that the defoliant application increased the seed cotton yield comparing control plots. Defoliant application positively influenced the seed cotton yield (kg ha -1 ), plant height (cm), number of opened bolls (per plant -1 ), boll weight (g) and boll seed cotton weight (g). However, there were no significant effects on the number of bolls (per plant -1 ) and 100 seed weight (g). It was concluded that defoliant application and timely sowing can be recommended for farmers in the region.

This study was conducted to determine the effect of Phosphorus (P) i.e. (P0= Control, P40= 40, P80= 80, and P120= 120 kg ha -1 ) and Zinc (Zn) i.e. (Zn0= Control, Zn05= 5, Zn10= 10, and Zn15= 15 kg ha -1 ) on yield and on some agronomic characteristics of cotton (Gossypium hirsutum L.) Adiyaman, Turkey. The field experiments were arranged in a randomized complete block with a split plot design with three replications in years of 2011 and 2012. P and Zn treatments were applied in main and sub-plots, respectively. Cotton cultivar of Stoneville-453 was used in the experiment. Based on the results, phosphorus and zinc applications increased the seed cotton yield. The highest plant height was obtained from the interaction of P80 x Zn5 and the highest number of bolls was taken from the interaction of P80 x Zn10. In terms of the number of monopodial branches, statistically significant differences were found in both years, but this significance was not stable over the years. It was concluded that the combined treatments of phosphorus and zinc did not have a significant effect on the boll weight, boll seed cotton weight and ginning outturn. The effect of fertilizers on the number of sympodial branches and 100 seed weight were significant in the first year but not significant in the second year.

Haliloglu -Beyyavas: The effects of nitrogen and zinc applications on the yield, yield components and oil ratio of safflower (Carthamus tinctorius L.

Uğur) verim, bitkisel özellikler ve lif kalite özellikleri yanında pazar fiyatı x verim = dekara gelir üzerinden çeşitleri sıralamak ve getirisi en yüksek olan çeşit veya çeşitleri belirlemek amacıyla planlanmıştır. Çalışma, Harran Üniversitesi Ziraat Fakültesi Eyyübiye kampüsü deneme alanında 2014 yılı yetiştirme sezonunda yürütülmüştür. Deneme tesadüf blokları deneme deseninde 4 tekerrürlü, her parsel 4 sıralı, sıra arası 70 cm ve sıra üzeri mesafe 15-20 cm olacak şekilde ekimi yapılmıştır. Ekim işlemi 2 Mayıs 2014 tarihinde deneme mibzeri ile yapılmıştır. Araştırma sonucunda; kütlü pamuk verimi ve dekara gelir yönünden Stoneville-468 ve BA-440 çeşitleri, erkencilik oranı yönünden BA-440, BA-119 ve Uğur çeşitleri, koza sayısı yönünden Stoneville-468, meyve dalı sayısı yönünden DP-499 ve Carisma, bitki boyu yönünden Candia, koza kütlü pamuk ağırlığı yönünden Stoneville-373 ve Candia, çırçır randımanı yönünden Carisma, Candia, BA-440 ve DP-396, 100 tohum ağırlığı yönünden Candia, Uğur ve Stoneville-453, lif kopma dayanıklılığı ve lif inceliği yönünden BA-440, lif uzunluğu yönünden Uğur, Stoneville-373 ve Stoneville-453, kütlü fiyatı yönünden Candia ve Carisma çeşitlerinin diğer çeşitlerden üstün olduğu saptanmıştır.