Studies were conducted to examine the form and the quantity of second dose of nitrogenous fertilizers given to wheat in spring in Yozgat's ecological conditions in Turkey during 1998-1999 and 1999-2000. Sowing, @ 500 seeds per square meter, was done with sowing seeder in the last week of September and 15 kg/da DAP was given at the time of sowing. Of the nitrogenous fertilizers, Ammonium sulphate (21 %N), Ammonium nitrate (26 %N) and Urea (46 %N) was applied @ 0. 20, 40, 60 and 80 kg/ha respectively. The experiment was Set Up as factorial in randomised blocks design with three replications. The effects of increasing dozes of fertilizer and the nature of nitrogen fertilizer on yield appeared to be important. The highest yield of 3287 kg/ha was obtained with 80 kg/ha Urea and the lowest yield of 1575 kg/ha, was obtained where fertilizer were not applied.