The research on foliar fertilization with the water solution of the 7 hydrate sulphate (VI) iron (II) applied with and without an addition of urea, was carried out. Three concentrations of the water solution of the waste were used. The results of the research show that because of the waste water solution influence, the content of nitrogen has increased in potato tubers and in spring barley grains. The addition of urea to the water solution of 7 hydrate sulphate (VI) iron (II), has caused an increase of the nitrogen content in the studied plants. Foliar fertilization with the water solution of the 7 hydrate sulphate (VI) iron (II) with and without the addition of urea, did not have a distinct impact on the content of phosphorus, calcium, potassium and magnesium in the studied plants. Foliar fertilization with FeSO4 ź 7H2O water solution with and without the addition of urea as well as the concentration of solutions with the waste in most cases, has increased the content of sulphur and iron in the studied plants.
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