The article analyzes and presents data on the growth and development of the Phoenix fiber flax variety during the growing season, depending on the type and ratio of mineral fertilizers. The object of research was the variety of fiber flax Phoenix. The use of the tested types of mineral fertilizers made it possible to obtain a yield of flax straw up to 9.49 t/ha and seeds up to 0.34 t/ha. In general, the most effective was the use of fertilizers in option 11 (pre-sowing application of NPK(S) 8:20:30(2) + 0.3B at a dose of 200 kg/ha + Ammophos NP 12:52 at a dose of 133 kg/ha + Kalimag 38 at a dose of 137 kg/ha + top dressing in the herringbone phase ammonium nitrate 34.6 at a dose of 59 kg/ha + trace elements), where the level of yield relative to the control increased by an average of 100% for straw and 70% for seeds. All yield data are confirmed by the elements of its structure. Thus, plant height ranged from 68 to 91 cm, technical length - from 54 to 70 cm, number of plants before harvesting - 1232-1616 pcs/ha, seed weight per plant - 0.16-0.22 g, straw weight - 0.40-0.60 g.
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