The laboratory vegetative chronic experiments, on the example of spring wheat, showed that reclaimed drill cuttings can be used for deoxidizing (liming) acidic soils, increasing the biomass yield in growing agricultural crops. Doses of drill cuttings providing long-term maintenance of optimum acidity of investigated soils are defined.

Alfalfa seed production depends on pollination of flowers and the level of large number of full seeds formation in the pollination of flowers per 1 bean, as well as the weight of 1000 seeds. Field studies were carried out in LLC “Urta Saba” of Sabinsky municipal district of the Republic of Tatarstan in 2014-2016. The soil is gray forest of heavy-loamed and granulometric distribution. Agrochemical indicators of soil are typical. The common method of field research with forage crops was used. During the experiments the weather conditions were madi-favourable for alfalfa seeds. The total area of plots is 80 m2, the accounting is 60 m2. The experimental scheme is as follows: 1) control without fertilizing; 2) foliar fertilizing by potassium sulfate; 3) fertilizing by potassium-magnesium; 4) fertilizing by potassium bisulfate; 5) fertilizing by potassium chloride. The object of research is variegated-hybrid alfalfa of Gyuzel. It is necessary to create optimum conditions for plant nutrient status for normal fruit formation of alfalfa. It was revealed, that the plants develop better during foliar fertilizers by potassium. Carrying out a foliar feeding of plants during flowering helped to raise the connection of beans on inflorescence of alfalfa, to increase the number of normally developed alfalfa seeds, by reducing the number of shrunken, undeveloped ones. And, in turn, it was accompanied with an increase in seed production and sowing qualities of alfalfa seeds.