Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Florian VELICU, Viorel ION
The actual increasing concerns of our society about the adverse environmental impacts of nitrogen losses in the context of increasing cost of nitrogen fertilizers impose to the farmers the optimization of nitrogen fertilization according to specific growing conditions of their crops. Nowadays, the selection of the right fertilizer products, the appropriate rate and time of application are essential for farmers to make sound nitrogen management decisions. In this context, the aim of this paper is to present the obtained results regarding the effects of different nitrogen rates and nitrogen fertilizer products on maize grain yield under the specific growing conditions of South Romania. The research was carried out in field experiments located in South Romania (44o22’ N latitude and 26o89’ E longitude), under rainfed conditions in the years 2022 and 2023. The experimental factors were the following: Factor A – Nitrogen Rate, with 4 graduations, respectively 36 kg/ha, 80 kg/ha, 120 kg/ha, 160 kg/ha; Factor B – Nitrogen Fertilizer, with 4 graduations, respectively Ammonium Nitrate, Urea, Urea with NutriSphere-N, Urea Ammonium Nitrate (UAN). The obtained results brought attention to the positive effects of Urea with NutriSphere-N to the maize grain yield, as well as to the dependence of the nitrogen rate on the climatic conditions of the year. Under drought conditions, the nitrogen rate should not be high, as this could be even a limiting yielding factor.
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