Evaluation of Cotton Growth and Yield Response to Nitrogen and Sulfur Fertilization-I

Tarla denemeleri azot ve kükürt uygulamalarının pamuk büyüme ve verimine etkilerini değerlendirmek amacıyla Ç.Ü.Ziraat Fakültesi araştırma alanında 2011-2012 yıllarında yürütülmüştür. Kükürt 0, 15, 30, 45 ve 60 kg ha-1 dozlarında ekimle birlikte toprağa uygulanmıştır. Azot 0, 60, 120, 180 ve 240 kg ha-1 dozlarında, üçe bölünerek uygulanmıştır. Meyve dalı sayısı, açmış koza sayısı ve kütlü pamuk veriminde 30 kg S ha-1 uygulaması ile önemli artışlar sağlanırken, 60 kg S ha-1 uygulamasında daha fazla artış gözlenmemiştir. En yüksek açmış koza sayısı, kütlü pamuk verimi ve koza ağırlığı 45 kg S ha-1 ve 120 kg N ha-1 uygulamalarında elde edilmiştir. Kütlü pamuk verimi ve koza ağırlığı daha yüksek dozda azot uygulandığında azalma, daha yüksek dozda kükürt uygulandığında artma eğilimine girmiştir. Azot uygulandığında kükürt uygulamasına önemli verim tepkisi ortaya çıkmış, azot dozunun artması durumunda verim artışı oluşmuştur. Yaprak N ve S içeriği yönünden her iki elementin ortak etkileri gözlenmiştir. Sırasıyla 120 ve 180 kg N ha-1ile 45 ve 60 kg S ha-1 dozlarında azot ve kükürt uygulamalarının, diğer uygulama dozlarına oranla daha iyi performans ortaya koydukları sonucuna varılmıştır.

Azot ve Kükürt Gübrelemesinin Pamuk Büyüme ve Verimine Etkisi-I

Field experiments were conducted to evaluate cotton growth and yield response to nitrogen and sulfur applications at the experimental areas of Department of Field Crops, Çukurova University, Adana, Turkey, in 2011 and 2012. Sulfur treatments of 0, 15, 30, 45, and 60 kg S ha-1 were broadcast at planting. Nitrogen treatments of 0, 60, 120, 180, and 240 kg N ha-1 were divided in to three dosage. Important increases in number of fruiting branches and open bolls per plant and seed cotton yield were measured at 30 kg S ha-1 while no significant increase was observed at 60 kg S ha-1 . The highest number of open bolls per plant, seed cotton yield and boll weight were observed with the treatment consisting of 45 kg S ha-1 and 120 kg N ha-1 . The seed cotton yield and boll weight tended to decrease as more N was applied however they were increased when N was applied with S. The N application had positive response on yield with S application and increasing N application in these situation positively affected on yield also. Joint effects of N and S on leaf nitrogen and sulfur content were found. It can be concluded that 120 to 180 kg ha-1 nitrogen and 45 to 60 kg ha-1 sulfur applications rates had better results than the rest of other N and S combinations.

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