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The aim of this study was to analyse e the effect of variety, nitrogen fertilizer rate and their interaction on yield and to determine the economic feasibility of application the fertilizer and varieties for optimum yield grain, two key drivers that contribute guiding the future with efficient agronomic practices to guarantee food security in the advent of the most significant changes for agriculture. The subject of the experiment consisted in testing during one wheat growing season, twenty-one modern winter wheat varieties fertilized with nitric and ammoniacal nitrogen in three different rates - 120, 150 and 170 kg N ha-1. The variety contributes to the production with 61%, the level of fertilizer with 2.4% and the interaction between the factors with 19.4%. The highest production in all fertilization levels and types of N was achieved by the Rubisko variety. The highest value of 5.94 kg/plot is obtained at 120 kg magnesium nitrate rate, and the lowest of 5.25 kg/plot at 150 kg ammonium sulfate. We concluded that increased wheat productions are not linearly linked to an increased nitrogen dose. [ABSTRACT FROM AUTHOR]

In 2022, on the chernozem from Caracal, in the wheat soils sown on 1,100 ha in the production farms of SCDA Caracal, the non-didactic department of the University of Craiova, in two locations: Caracal and Stoenești, FOLIQ 36 Nitrogen was administered to 7 wheat varieties: Glosa, Otilia, Izvor, Avenue, Gabrio, Euclide and Caro line. Leaf samples were taken from 13 physical blocks (one not treated with foliar fertilizer and 12 fertilized with foliar in two doses) in accordance with the leaf sampling instructions approved by the Analitycal Services Laboratory of Yara UK Limited-Packlington. Macro- and micro-nutrients were determined by laboratory analysis in England as follows: nitrogen (%), phosphorus (%), potassium (%), calcium (%), magnesium (%), sulphur (%), iron (ppm), zinc (ppm), manganese (ppm), boron (ppm), copper (ppm), molybdenum (ppm). Interpretation of the results showed that a dose of 1 l/ha significantly increased the zinc content, iron content and nitrogen content of the plant; significantly distinctive also the copper and sulphur content of the plant was increased; very significantly increased were the boron content and phosphorus content of the plant. The same dose also influenced yield very significantly. In general, Gabrio, Avenue and Euclide varieties showed high yields but also high nitrogen, boron, copper, calcium and phosphorus contents. [ABSTRACT FROM AUTHOR]