Based on the data of a field experiment on sod-podzolic sandy loam soil in the Kaluga Region, it was shown that the use of the organo-mineral complex Gumiton had a positive effect on the biometric indicators of growth and development of oat plants, yield and quality of vegetative mass. When oats were treated with Gumiton in the boot-up phase, the vegetative mass yield increased by 13 %, in the earing phase - by 46 %, and with a double treatment of plants in both these phases - by 48 %. A single treatment with Gumiton in the boot-up phase did not lead to an increase in grain yield, but increased the straw mass by 21.5 % in relation to the control; when treated in the earing phase of oats, the grain yield increased by 17 %, and the straw mass - 23.5 %. Treatment of crops with Gumiton in the oat boot phase contributed to an increase in the ash content in grain by 12 %, double treatment – by 18 %. The content of crude protein in grain did not change either with a single application of Gumiton in different phases of plant development or with double spraying. The fiber content in grain increased with the use of Gumiton in the boot phase of oats by 21.5, at the panicle stage – by 13, and with double treatment – by 31 %. Double spraying of oat crops with Gumiton led to a 17 % decrease in the fat content in the grain.

Based on the results of three-year production tests, the effectiveness of the use of PhosAgro NPK complex fertilizer and a new organ-mineral complex based on Gumiton peat in potato cultivation technologies on radioactively contaminated sod-podzolic soils in the Novozybkovsky district of the Bryansk region was assessed. Soils differed in the level of fertility and in the density of137Cs pollution. It was shown that leaf treatment of 1 l/ha Gumiton plantings in the potato budding phase without fertilizer contributed to a 19 – 58% increase in tuber yield relative to control, depending on the year. The introduction of PhosAgro NPK fertilizer at a dose of 0.5 t/ha ensured an increase in potato yield by 22 – 42% relative to the control. The joint use of fertilizer and the drug increased the tuber harvest by 12 – 19%, compared to the PhosAgro NPK variant and by 37 – 68% relative to control. The multiplicity of the decrease in137Cs intake into tubers during the treatment of potato plantings with Gumiton was up to 6.4 times in relation to the control, with the combined use of the drug and fertilizer – up to 3.4 times in comparison with the PhosAgro NPK variant. The use of Gumiton and PhosAgro NPK guaranteed the production of potato tubers with137Cs content in accordance with SanPiN 2.3.2 standards. 2650-10. The use of the Gumiton organic-mineral complex and PhosAgro NPK complex fertilizer for production of regulatory clean potato products should be recommended on radioactively contaminated sod-podzolic soils of the Bryansk region.

Based on the results of three-year production tests, the effectiveness of new agromeliorants (PhosAgro NPK complex fertilizer and Gumiton organo-mineral complex) was evaluated when growing barley on radioactively contaminated sandy loam soddy-podzolic soils of Novozybkovsky district of Bryansk region. It is shown that non-root treatment of barley crops in the earing phase with Gumiton (1 l/ha) without the use of fertilizer contributed to an increase in grain yield by 17-29% relative to the control, depending on the year. The introduction of PhosAgro NPK fertilizer (0.3 t/ha) gave an increase in yield of 22-39%. The combined use of fertilizer and the drug increased the yield by 18-72%. The multiplicity of the decrease in the intake of 137Cs in grain during the treatment of crops with Gumiton was up to 2.3 times, with the combined use of the drug and fertilizer - up to 4.7 times compared with the control. The use of Gumiton and PhosAgro NPK guaranteed the production of grain with a content of 137Cs corresponding to the standards of Sanitary Rules and Regulations 2.3.2. 2650-10. The conditional net income per 1 ruble of costs for processing barley crops with Gumiton amounted to 3.75-17.6 rubles, depending on the year. Both the introduction of PhosAgro NPK and the treatment of barley crops with Gumiton did not significantly affect the grain quality indicators: the content of protein, ash, fat, fiber. Thus, it is shown that the organo-mineral complex Gumiton and complex fertilizer PhosAgro NPK are effective agromeliorants in barley cultivation technologies in conditions of radioactive contamination of soils.

In a vegetative experiment on soddy-podzolic sandy loamy soil, in which 137Cs was introduced, the effectiveness of use of the new organo-mineral complex Humiton and NPK on fodder crops was shown. With their combined use, the productivity of the green mass of the pea-oat mixture (1:1) increases by 49-65%, the accumulation coefficient of 137Cs decreases by 44 47%. The most effective option was the treatment of vegetative plants with Humiton against the background of the introduction of NPK.

In a vegetative experiment on polluted 137 Cs soddy-podzolic soil with peas ( Pisum sativum L.) of the variety Pharaon, a comparative assessment of the effect of the organo-mineral fertilizer SUPRODIT-M, organo-mineral complex GEOTON, and mineral fertilizers (NPK and azofoska) on the content of radionuclide forms in the soil, soil biological activity, productivity, and quality of peas was undertaken. Mineral fertilizers and SUPRODIT-M were introduced into the soil, and plants were treated with the preparation GEOTON two times during the growing season. The effect of various types of agrochemicals was evaluated by changes in the potential activity of respiration (the rate of CO 2 emission in the soil), the potential activity of soil denitrification, the content of 137 Cs forms in the soil, the transfer factor ( T f ) of 137 Cs in plants, the yield and indicators of grain quality, and vegetative mass of peas. The use of SUPRODIT-M helped to reduce the content in the soil of 137 Cs for the most accessible for plant exchange and mobile forms compared with the use of mineral fertilizers. It is known that leguminous crops (Fabaceae) under conditions of radioactive soil contamination accumulate 137 Cs in the yield up to ten times more than spring and winter cereals. Adding NPK to the soil stimulated the rate of CO 2 emission in the soil under the peas compared to the control. Application of SUPRODIT-M and azofoska reduced the potential activity of denitrification of the soil. SUPRODIT-M increased the seed yield and vegetative mass of peas. Treatment of vegetating plants with GEOTON against the background of SUPRODIT-M additionally increased the yield of peas compared to the option without treatment and relative to the control. The greatest yield of peas is obtained from the use of GEOTON against the background of mineral fertilizers. SUPRODIT-M limits the transfer of 137 Cs from the soil to plants compared with mineral fertilizers. Introduction of SUPRODIT-M contributed to a significant reduction in the removal of 137 Cs by peas relative to the control. The use of GEOTON against the background of SUPRODIT-M further reduced the removal of 137 Cs by the plant and the vegetative mass compared to the variant without treatment and the relatively absolute control. SUPRODIT-M had a positive impact on the indicators of quality of the seed and the vegetative mass of peas.

Given the composition and properties of new organo-mineral complex based on peat GUMITON. The charac-teristics of peat required for the production GUMITON. Con-ducted production tests GUMITON in farms of different owner-ship forms, on different types of soils, crops and potatoes. It is shown that the use of GUMITON in the cultivation of grain crops increased the productivity of spring wheat – by 15-22%; winter wheat by 17-40%; barley – by 19.5-23%; triticale – by 13-14%. The protein content in grain of winter wheat in the pro-cessing GUMITON increased up to 2.1%; spring wheat – up to 2.1%, in triticale grain – up to 1.3% compared to untreated crops. Collection of triticale protein (centner/ha) increased by 21-27%. The use of GUMITON is a highly effective method of increasing potato yield in agricultural technologies. The use of GUMITON allowes to increase the yield by 12-36% and to obtain an addi-tional crop of potato tubers on floodplain soil up to 5.7 t/ha, on soddy-podzolic soil - up to 9.8 t/ha; and on gray forest soil – up to 10.0 t/ha, depending on the variety.

The mobility and migration capacity of Zn in the soil-plant system were studied in a series of pot experiments with barley as a test plant. The parameters of Zn accumulation depending on the metal concentrations in soils and soil solutions were estimated by soil and water culture methods. Experiments with barley in water culture were performed on a nutrient (soil) solution extracted from soddy-podzolic soil (Albic Retisol (Loamic, Ochric)) to which Zn 2+ was added to reach working concentrations increasing from 0.07 to 430 μM. Different responses of barley plants to changes in the concentration of Zn in the studied soil were identified. Ranges of the corresponding concentrations in the soil and aboveground barley biomass were determined. Parameters of Zn accumulation by test plants were determined depending on the metal content in soddypodzolic soil and the soil solution. A new method was proposed for evaluating the buffer capacity of soils with respect to a heavy metal (Zn) using test plants (BCS(P) Zn ). The method was used to evaluate the buffering capacity of loamy sandy soddy-podzolic soil. The considered methodological approach offers opportunities for using data obtained during the agroecological monitoring of agricultural lands with heavy metals (HMs), including the contents of exchangeable HMs and macroelements (C and Mg) in soils and concentrations of HMs and (Ca + Mg) in plants, in the calculation of the buffering capacity of the surveyed soils for HMs.