PRODUCTIVITY OF HAYMAKERS DEPENDING ON FROM MINERAL FEED LEVEL
Long-term (2008-2014) studies of the effects of mineral fertilizers on the productivity of radioactively contaminated hayfields in the Iput River of the Novozybkovsky District of the Bryansk Region were carried out. The purpose of the work is to investigate the role of mineral nutrition of mineral fertilizers in increasing the productivity of the air-dry mass of natural and sown grass of radioactively contaminated hayfields. It was established that the natural-climatic potential of the southwestern part of the Bryansk region provides the productivity of the air-dry mass of the natural grass of floodplain meadows at a low level of 2.0 tons/ha, the use of agrotechnical and organizational measures to improve meadows increases the productivity of fodder lands by 13-25%, and only agrochemical measures to improve meadows up to 5.4 times increase the productivity of hayfields. Therefore, in order to increase productivity to 13.6 t/ha of the air-dry mass of grass in total for two ditches of floodplain meadow, it is necessary to use N<sub>90</sub> in full and nitrogen-potassium fertilizers at a ratio of nitrogen to potassium as 1: 1, regardless of measures of meadows improvement, at the same time the highest payback of 20.5-30.5 kg per kg d.v. increase of the first crop and 23.3-29.7 kg per kg d.v. of the second bite is provided by N<sub>60</sub> in full and nitrogen-potassium fertilizers at ratio of nitrogen to potassium as 1:1.