INFLUENCE OF MINERAL FERTILISERS ON THE DYNAMICS OF NITROGEN, PHOSPHORUS AND POTASSIUM CONTENT IN SUNFLOWER PLANTS UNDER CONDITIONS OF UNSTABLE MOISTURE ZONE OF THE CENTRAL PRE-CAUCASIAN REGION
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Materials on the influence of application of various forms of mineral fertilisers at sowing, produced by "PhosAgro" company, on the dynamics of nitrogen, phosphorus and potassium content in plants and sunflower yield in 2020-2022 are presented. In the course of research during sunflower vegetation it was found that compared with the control variant, all studied in the experiment mineral fertilisers contributed to an increase in the indicators of macronutrients: nitrogen ( N ) - by 0.29 - 0.43 %, phosphorus ( P2O5 ) - by 0.05-0.09 %, potassium ( K2O ) - by 0.12 - 0.47 %. Maximum productivity of sunflower (2,57 - 2,79 t/ha), in all studied years provided pre-sowing application of NPK(S) N30P30K30 - 200 kg/ha, which is significantly higher on average than the yield of all fertilised variants by 0,22 - 0,76 t/ha. The maximum content of nitrogen ( N ) on average for two years of research in sunflower plants was observed in the variant with the application of urea (urea) B brand ( Nm N46 ) at a dose of 100 kg / ha - 2.97 %, phosphorus ( P2O5 ) - when applying a brand of mineral fertilisers ( MAP NP 12: 52 ) at a dose of 100 kg/ha - 0.51 %, potassium ( K2O ) - at the variant of application of mineral fertiliser brand ( APP N12P52 ) at a dose of 140 kg/ha - 3.12 %. On average for two years of research maximum yield of sunflower was obtained at ( NPK (S) N30P30K30 ) - 2.79 tonnes/ha.
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