Belarusian scientists consider organomineral fertilizers based on humic compounds to be promising fertilizers. Currently, a waste-free method for producing organomineral fertilizers from lowland peat has been developed and patented in Tyumen, three types of organomineral fertilizers have been obtained, their common name is the Tyumen agrochemical: peat-humic mixture (grade A), sulfatofulvic solution with the addition of mineral fertilizers (grade B), humic preparation (grade B). This article presents the results of the reaction of onion varieties Stuttgarter Riesen, Sturon, Red Semko to the root application of grades A and B of the Tyumen agrochemical. Doses of use: brand A – 1 l/10 l, brand B – 20 ml/10 l. Root treatment of plantings was carried out in the phase of 4-6 leaves, the consumption of the working solution was 10 l/m2. A varietal reaction to the Tyumen agrochemical was noted. The Sturon and Stuttgarter Riesen varieties responded to its use to a greater extent, and Red Semco to a lesser extent. Root application of the Tyumen agrochemical on onion variety Red Semko did not have a significant effect on the number of leaves. Onion plants of the Sturon and Stuttgarter Riesen varieties responded to the Tyumen agrochemical grades B and A by increasing the number of leaves by 11-32%. Root application of grades B and A of the Tyumen agrochemical on onions of the varieties Red Semko, Sturon and Stuttgarter Riesen significantly increased the weight of leaves compared to the control – by 10-113%, the diameter of the bulb – by 12-29%, the weight of the bulb – by 17-87%, yield – by 17-88%.