On food importance and the scale of production, the leading position among grain crops is wheat. In the total structure of sown areas of spring cereals wheat in the Republic of Mari El has a significant share. The average grain yield of spring wheat is less than 2 t/ha. Maintaining and increasing yield of spring wheat is not possible without the use of fertilizers. Along with mineral fertilizers are increasingly important fertilizers of natural origin, such as humates. Humates are unique natural compounds that play a fundamental role in the ecosystem “water – soil – plant”. Humates accelerate growth and development of plants, improve yields, shorten the ripening time and improve product quality and safety, improve the immunity of plants to adverse factors: diseases, drought, frost, replanting, pesticide and chemical stress, stimulate the growth of soil microflora, accelerate the process of composting, etc. The research have been conducted to study the effects of foliar feeding of crops of spring wheat with potassium humate and potassium. Sodium humate in powder form with a content of the active substance 80–85 % liquid concentrated 12 % aqueous solution of potassium humate were used for experiments. The following good practices were taken for treatment plants: humate sodium – 0,15 kg/ha, potassium humate – 0,8 l/hectares, at a flow rate of the working fluid 250 l/ha. Processing of crops conducted knapsack sprayers in the phase of tillering and earing. The use of humates sodium and potassium significantly increased the grain yield of spring wheat. The increase in control was 0,18–0,25 t/ha.