RESULTS REGARDING THE FERTILIZATION OF THE SUNFLOWER CROP WITH AN EFFLUENT OBTAINED BY WASTEWATER TREATMENT
The research was carried out in 2020 on the sunflower crop grown in sandy soils in southern Oltenia and aimed at the influence of fertigation with an effluent obtained by wastewater treatment, compared to conventional fertilization and irrigation with normal water from surface water sources. The obtained results showed the positive influence, on the nutritional status of the plant, of ensuring the dose of nitrogen in the vegetation by fertigation with purified water, applied fractionally in 2-3 steps (Nt-3.5%; Pt = 0.35% Kt = 2.7%), compared to classical fertilization and irrigation with normal water from surface water sources. It was noted with the best results on production (4427.5 kg / ha) and the weight of one thousand grains (69 g), the variant in which the dose of 70 kg N / ha, required in vegetation, was ensured by irrigation with treated water, applied fractionally in two doses of 50%, starting with the phase of 5-7 leaves.
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