Assessment of the efficiency and optimization of the modes of pre-sowing electrical stimulation of sunflower seeds
DOI:
https://doi.org/10.31734/agroengineering2022.26.085Keywords:
sunflower seeds, electrical stimulation, electric treatment modes, single photons, emission, germination energy, laboratory germinationAbstract
The article is devoted to improvement of the sowing qualities of sunflower seed material by its pre-sowing electrical stimulation in the electric field of the corona discharge and optimization of the modes of its implementation.
To reveal the cause-and-effect connection between the pre-sowing seed treatment modes and its sowing and yield qualities, to optimize processing parameters and to expand knowledge about the mechanism of biological processes in stimulated seeds, it is proposed to use the method of time-correlated counting of ultra-low emission of TCSPC photons emitted by sunflower seeds after processing in the electric field of the corona discharge.
As a result of the research, it is revealed that absorption and transformation of the energy of the external electric field during the electrical stimulation of seeds occurs non-linearly. The main transformations take place during the first 15-20 seconds, regardless of the electric field intensity.
It was found that pre-sowing electric stimulation of sunflower seeds led to improvement in its germination energy. In all studied processing options, this indicator exceeded the control. The highest values of germination energy were observed during pre-sowing electrical stimulation with voltage E = 2.0 kV/cm and exposure of t = 20...30 s. Under such parameters of electrical treatment, the energy of germination was 90...92 %, which is 16...18 % higher than the control indicators recorded at the level of 74 %.
It is also found that pre-sowing treatment of sunflower seeds has a positive effect on its laboratory germination. The largest increase to the control, i.e. 8%, was observed under the treatment mode of E = 2,0 kV/cm and exposure of t = 25 sec. Under these conditions, the laboratory similarity reached 96 % against 88% in the control. Laboratory similarity also increased with the treatment mode E = 2,0 kV/cm and exposures of t = 20 sec and t = 30 sec. In that case, it was 94 %, which was 6 % higher than the control version.
The obtained results of pre-sowing electrical stimulation of sunflower seeds confirm that such technological measure should be used in the technology of post-harvest preparation in order to obtain high-quality seed material with increased sowing properties.
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