Effect of Different Forms of Nitrogen and Boron on the Yield and Removal of Macroelements by Fiber Flax (Linum usitatissimum L.f. elongata) when Cultivated on Sod-Podzol Medium Loamy Soil

Fiber flax is the most important industrial crop, which is very demanding on the mineral regime and reacts strongly to nutrient deficiencies in the soil. The root system of fiber flax is characterized by a shallow location and low absorption capacity. The crop consumes most of the mineral nutrients in a relatively short period of time. In this context, the purpose of our research was, to determine the effect of different forms of nitrogen and boron on the yield and macroelement removal by fiber flax of the Caesar variety in the conditions of vegetation experiment. As a result of the studies, it was found that the application of nitrogen fertilizers, regardless of the form in which the element of mineral nutrition is located, increases the yield of fiber flax by 10.33-13.43 g/vessel, the dry matter content in the industrial crop – by 2.40-7.43%. The increased removal of macroelements by the plants was as follows: nitrogen – by 139.2-230.3 mg/vessel, phosphorus – by 34.8-66.4 mg/vessel and potassium – by 132.9-235.5 mg/vessel compared to the control. The addition of boron to the ammonium and nitrate forms of nitrogen increases the crop yield by 5.05 and 7.94%, nitrogen removal by 10.9 and 16.9% and phosphorus removal by 16.4 and 22.1% compared to options without adding microelements. The use of ammonium sulphate and urea increases the nitrogen content in industrial crops by 15.47 and 16.27% compared to the control. The combined application of sodium nitrate and boric acid increases the removal of potassium by fiber flax, where the increase due to the use of the microelement is 14.1%.

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