This study aimed to determine the effect of application rates of N and B on cotton yield and fiber quality. Suregrow 125 (Gossypium hirsutum L.) was grown on a clay soil having an average mg kg-1 B concentration. | Turk J Agric For 29 (2005) 51-59 © TÜB‹TAK Interactive Effect of Nitrogen and Boron on Cotton Yield and Fiber Quality Özgül GÖRMÜfi Çukurova University, Faculty of Agriculture, Department of Field Crops 01330 Adana - TURKEY Received: Abstract: This study aimed to determine the effect of application rates of N and B on cotton yield and fiber quality. Suregrow 125 -1 (Gossypium hirsutum L.) was grown on a clay soil having an average mg kg B concentration. Analysis of leaf tissue taken at early bloom and before the nutrient application indicated that N and B concentrations were sufficient. Nitrogen was applied to the soil at rates of 0, 80 and 160 kg ha-1, and B was applied to the foliage 3 times for totals of 0, and kg B ha-1. Foliarapplied B significantly increased leaf blade B concentration in both years. Foliar-B sprays significantly increased boll number, boll -1 -1 weight, seed cotton and lint yield. The application of kg ha B and 160 kg ha N resulted in the highest number of bolls. B -1 increased boll weight from to g boll and boll bearing from to bolls plant-1 in 2003. Consequently, B application resulted in increased crop yield over the control. Neither N nor B treatments had any significant effect on fiber properties. This study demonstrated that cotton needed supplemental B when the soil B concentration was low. Key Words: Cotton, foliar-B treatment, N rates, yield Azot ve Bor’un Pamuk Verimi ve Lif Kalitesine Karfl›l›kl› Etkisi Özet: Bu çal›flmada azot ve bor uygulama dozlar›n›n, pamuk verimi ve lif kalitesi üzerine etkilerini saptamak amaçlanm›flt›r. Suregrow 125 (Gossypium hirsutum L.) pamuk çeflidi, ortalama toprak B konsantrasyonu mg kg-1 olan killi toprakta yetifltirilmifltir. Çiçeklenme bafllang›c›nda ve besin elementi uygulamalar›ndan önce al›nan yaprak örneklerinde yap›lan doku analizleri, N ve B -1 konsantrasyonlar›n›n yeterli düzeyde oldu¤unu göstermifltir. Denemede, topra¤a üç .
