Uman NUH | today: 11/13/2022

Agrochemical parameters of gray podzolic soil for growing bioenergy crops

Author(s) Бойко І. І., , ,
Грищенко В. О., , ,
Rassadina I.Y., postgraduate, , Uman National University of Horticulture
Климович Н.М., , ,
Category The Agronomy
year 2022 issue Issue 100. Part 1
pages 225-231 index UDK 633.17:631.527.5:631.5(477.7)
DOI 10.31395/2415-8240-2022-100-1-225-231 (Link)
Abstract Introduction. Growing bioenergy crops is one of the methods of cleaning low- or medium-contaminated lands with inorganic and organic impurities, which makes it possible to preserve soil fertility after removal of pollutants. Methods. Field, laboratory, statistical, analysis. Results. Agrochemical parameters of the soil layer 0–10 cm varied depending on the duration of vegetation of bioenergy crops. Thus, their long-term cultivation caused deterioration of agrochemical characteristics of the soil. Metabolic acidity decreases by 5–8 %, hydrolytic acidity increases by 5–6 %, the amount of absorbed bases decreases by 5–8 %, nitrogen content of mineral compounds – by 26–29 %, mobile phosphorus compounds – by 6–8 %, mobile compounds potassium – by 5–6 %. The agrochemical parameters of the soil were the least affected by the cultivation of switchgrass and giant miscanthus, and the worst by the energy willow. Obviously, this is due to the magnitude of the formation of vegetative mass and the influence of root secretions in the soil. It should be noting that keeping the soil under clean steam almost did not affect the metabolic and hydrolytic acidity and the amount of absorbed bases, but contributed to the mineralization of humus. The absence of plants led to a higher nitrogen content of mineral compounds, and mobile compounds of phosphorus and potassium remained almost unchanged. Conclusions. Agrochemical parameters of gray podzolic soil for growing different bioenergy crops have been establishing. Under the condition of growing switchgrass since 2009, the metabolic acidity decreases from 6.90 to 6.60, hydrolytic increases from 2.01 to 2.11 resins/kg of soil, the amount of absorbed bases decreases from 10.7 to 9.8 resins/kg humus content – from 2.52 to 2.41 %, nitrogen content of mineral compounds – from 42 to 31 mg/kg, mobile phosphorus compounds – from 110 to 101, mobile potassium compounds – from 121 to 114 mg/kg of soil. The agrochemical characteristics of the soil under crops of giant miscanthus are similar to switchgrass. Under the condition of growing energy willow since 2012, the metabolic acidity decreases from 5.92 to 5.85, hydrolytic increases from 2.23 to 2.29 resins/kg of soil, the amount of absorbed bases decreases from 9.7 to 9.2 resins/kg, humus content – from 2.52 to 2.49 %, nitrogen content of mineral compounds – from 39 to 28 mg/kg, mobile phosphorus compounds – from 114 to 108, mobile potassium compounds – from 123 to 116 mg/kg soil.
Key words miscanthus, switchgrass, energy willow, agrochemical parameters of soil, nutrient elements
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