The field experiment was laid out with randomized block design with split plot and three replications during the 1991-92 years. Each plot was 16 m2. Tobacco-waste at the rates of 0, 10, 20, 30 and 40 tons/ha were applied to the plots and Bezostiya wheat variety was sown in 23rd October, 1991. | Tr. J. of Agriculture and Forestry 22 (1998) 593-600 © TÜBİTAK Determination of the Utilization of Nitrogen From Tobacco Waste By Wheat Crop With 15 N Tracer Technique* A. Reşit BROHI, M. Rüştü KARAMAN Gaziosmanpaşa Üniv., Ziraat Fakültesi, Toprak Bölümü, Tokat-TURKEY Akgün AYDENİZ Adnan Menderes Üniversitesi, Aydın-TURKEY Received: Abstract: The field experiment was laid out with randomized block design with split plot and three replications during the 199192 years. Each plot was 16 m2 . Tobacco-waste at the rates of 0, 10, 20, 30 and 40 tons/ha were applied to the plots and Bezostiya wheat variety was sown in 23rd October, 1991. Nitrogen as (NH4)2SO4 at the rates of 0, 20, 40, 60 and 80 kg N/ha was applied st 15 to the plots in 31 March, 1992. The rates of 20 and 80 kg N/ha were only labelled wth N at 10% atom excess because of their high cost under field conditions. Wheat crop was harvested in 13th July, 1992. Straw and grain yield were recorded. The straw and grain were analysed for total N and 15 N by emission spectrophotometry. According to the results of this research, increasing tobacco-waste and nitrogenous fertilizers have important effect on the yield, N content and N uptake of wheat crop. The % Ndff (nitrogenous fertilizer) increased from to at 20 and 80 kg N/ha respectively for wheat straw. The % Ndf (Tobacco-waste) was , , and (as the mean of 20 and 80 kg N/ha rates) at 10, 20, 30 and 40 tons/ha rates, respectively. The percent N utilization of nitrogen fertilizer (.) decreased from to at 20 and 80 kg N/ha rates, respectively. The percent utilization of was , , and (as the mean of 20 and 80 kg N/ha rates) at 10, 20, 30 and 40 tons/ha rates respectively. In wheat grain, the percent N utilization of nitrogen fertilizer (.) decreased from to at 20 and 80 kg N/ha, respectively. The percent utilization of decreased from (control) to (40 .
