Plant and Soil Science

Nitrogen is one of the main elements of the spring wheat nutrition, based on its biological characteristics. Today, along with the traditional nitrogen fertilizers, their analogs are present on the market. These fertilizers, due to features of their composition, have the effect of both soil and plant. Therefore, the different types of fertilizers application require additional study. The aim of the study was the wheat efficiency fertilization by traditional fertilizers (ammonium nitrate, urea, UAN) and a urea-ammonium nitrate with sulphur (UAN + S) on the content of nitrogen compounds in the soil and grain yield. The foliar nutrition was carried out at a dose of 30 kg / ha of nitrogen in the background of the N50P80K80 application. The highest content of the mineral nitrogen and its alkali hydrolyzed compounds were obtained in the variant with amid nitrogen fertilizers application. The significant changes in dynamics are noted in variants with urea and UAN. This tendency is maintained during the entire of spring wheat vegetation period. But, the foliardressing of UAN + S increased the yield of wheat grain by 0.43 tons compared to ammonium nitrate and 0.2 tons compared to the traditional analogue (UAN). First, this is due to the positive effect of sulphur, which is part of the fertilizer of the brand UAN + S. 

spring wheat, foliar nutrition, nitrogen fertilizers, meadow-chernozemic soil mineral nitrogen, alkaline hydrolysed nitrogen, yield