The article evaluates the effectiveness of the use of Aquarin, sodium humate, Epin and Zircon in the production of flax products. The use of these preparations was studied for topdressing of plants during the growing season and in the process of retted stalks maturation. Topdressing of crops was carried out in the phase of “rapid growth”. The processing of the fiber flax ribbon was carried out on the fifth day after pulling. The greatest efficiency in spraying fiber flax crops and processing retted stalks was shown by the combined use of Aquarin and Humate “Fertility”. The combined treatment of crops with Aquarin and a humic preparation provided an increase in all production indicators: straw yield increased by 11.6 %, seeds by 24.8 %, retted stalks and fibers by 4.6-6.2 %, and scabbard fiber by 44 %. The treatment of flax ribbon with micronutrient fertilizer Aquarin together with Humate “Fertility” led to an increase in the fiber yield by 5.1 %, the long fiber yield by 2.4 %, and the fiber strength by 0.35 Dan. The data obtained make it possible to recommend the use of preparations both during the growing season and in the process of retted stalks maturing to increase the efficiency of fiber flax production.