The determination of nitrogen and phosphorus fertilizer requirement of wheat in Diyarbakir conditions

The objective of this study was to determine the nitrogen and phosphorus fertilizer demand of Yakamoz wheat variety. The experiment was carried out with three replications according to factorial experimental design in random blocks in 2017-2018 growing season. In the experiment, nitrogen fertilizer was applied at 0, 4, 8 and 12 kg N/da doses and phosphorus fertilizer at 0, 5 and 10 kg P2O5/da doses. Half of the nitrogen and all of the phosphorus fertilizer have been applied together with the sowing. Nitrogen fertilizer is used in ammonium sulphate (21% N) form and triple superphosphate (42-44% P2O5) as phosphorus fertilizer. According to experiment results, different nitrogen doses significantly affected biological yield, grain yield, stem yield, plant height, number of spike per square meter, grain number in spike, harvest index, hectoliter weight, protein ratio, protein yield, N ratio in grain, P, Ca, Fe, and Cu content in grain. The effect of different nitrogen doses on 1000-grain weight and K, Mg, Mn, Zn contents of grain were not significant. The different phosphorus doses significantly affected biological yield, stem yield, plant height, and Mg and Fe contents on grain. As a result, when the yield and yield components are considered together, it can be concluded that 8 kg N/da and 5 kg P2O5/da doses are suitable for Yakamoz wheat variety on Diyarbakır dry conditions. In the case of the application of fertilizer recommendation in Diyarbakır dry condition, it is determined that 524 kg/da grain yield and 865 kg/da stem yield can be obtained in yakamoz wheat variety. Keywords: Diyarbakır, Wheat, Fertilization, Nitrogen, Phosphorus, Grain yield, Yield components, Plant growth