LEAF-STEM MASS OF OILSEED RADISH OF INTERMEDIATE (SUMMER) SOWING PERIOD AS A RAW MATERIAL FOR BIOGAS PRODUCTION
Abstract
The aim of the research was to investigate the feasibility and potential efficiency of using raw oil radish leaf mass as a raw material for biogas production, taking into account the hydrothermal conditions of vegetation and the levels of bioproductivity and basic biochemical composition formed by them in the format of studying the possibility of integrated biogas and green manure application of oil radish. Methods. The study was conducted during 2020–2024 on the basis of the experimental field of Vinnytsia NAU on gray forest soils with medium fertility potential. The experiment was replicated four times. The arrangement of variants was systematic in two tiers. The experiment involved a comparative analysis of bioproductivity indicators, hydrothermal conditions of vegetation with the data of basic indicators of biogas productivity determined by laboratory modeling. Results. The possibility of using the leaf mass of oil radish grown under summer sowing conditions as a variant of its widespread green manure and bioconservation use for biogas production using the classical process of combined anaerobic fermentation with a digestate inoculum at normal incubation temperature was determined. The possibility of achieving a 90% level of effective realization of the biogas potential of cellulose-containing agrobiomass fermentation (in the value of 300 lN/kg of organic dry matter) under conditions of moderate moisture content at a HTC in the range of 1.2–1.5 at a temperature in the range of 17–18 °C was proved. The nature of the biogas productivity of oilseed radish leaf mass was studied on the basis of dynamic graphs of daily fixation and the basic features of this process were determined in view of their consideration in practical aspects of biogas production. Conclusions. The leaf mass of oil radish obtained during cultivation at the summer (intermediate) sowing period is an effective component of the basic raw material for biogas production in the cofermentation system with digestate inoculation options with an achievable biogas potential interval of 250–300 lN/kg of organic dry matter. The limiting factors of this level of productivity are primarily hydrothermal regimes of the vegetation period to the flowering phase. Optimality is achieved at a moderate level of summer average daily temperatures (17–18 oC) and humidity (HTC 1.2–1.5).
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