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5 International Scientific Online Conference   DOI: https://doi.org/10.15414/2021.9788055224015

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                   STUDY OF SOME BIOLOGICAL EFFECTS OF ALGINITE ON PLANT AND INSECTS
                          Dina Elisovetcaia , Raisa Ivanova , Jana Simkova , Jan Brindza
                                             1
                                                               1
                                                                               2
                                                                                              2
                   1 Institute of Genetics, Physiology and Plant Protection, Chisinau, Republic of Moldova;
                                             E-mail.: dina.elis.s@gmail.com
                                  2 Slovak University of Agriculture in Nitra, Slovak Republic
                  Alginite  is  an  organic-bituminous  rock,  rich  in  macro-  and  microelements.  Due  to  its
             unique chemical composition, alginite improves the soil, affects the growth and development
             of plants, and increases yield and productivity. The purpose of our work was to study the effect
             of alginite of Slovak origin on germination of tomato seeds, growth, and development of plants,
             as well as to evaluate the biological activity of alginite against insect pests.
                  The  research was  carried out  by standard methods in the  laboratory and greenhouse
            during 2020. Tomato seeds with low germination capacity (60.0 %) were treated by immersion
            in alginite solutions of concentration 0.0001, 0.001, 0.01 and 0.1 %. Alginite solutions with
            concentrations of 0.1–5.0 % were used for testing against insects.
                  The  application  of  alginite  solutions  significantly  increases  the  germination  of  tomato
            seeds  in  laboratory  conditions  by  9.2–13.0  %  (LSD0.05=8.82,  p≤  0.05).  The  highest  seed
            germination (81.3 %) was observed in the variant with the alginite concentration of 0.001 %,
            the lowest (77.5 %) – in 0.1 % concentration. In addition, there was a significant increase in the
            length of seedlings by 1.87 and 2.98 cm (LSD0.05=1.61, p≤0.05) in variants treated with 0.01 and
            0.1 % alginite solutions, respectively. An increase in root length by 2.22, 3.54, and 4.51 cm was
            observed  in  three  variants  of  treatment  with  alginite  solutions  of  0.001,  0.01,  and  0.1  %,
            respectively  (LSD0.05=1.55,  p≤0.05).  Thus,  the  alginite  solutions  lead  to  both  a  significant
            stimulation of the germination of tomato seeds and to the growth of seedlings and roots.
                  In a greenhouse, the germination of pre-sowing treated seeds in all variants exceeded the
            control by 8.3–33.2 %. However, a significant difference (LSD0.05=20.5, p≤0.05) was noted only
            in the variant where the seeds were treated with 0.001 % alginite solution. Monitoring of plant
            height showed that a month after the emergence of the first seedlings the average plant height
            was  significantly  higher  in  the  variant  0.001  %  alginite  solution  and  reached  11.41 cm
            (LSD0.05=2.63, p≤0.05). The average plant height in the rest of the tested variants was at the
            control level (8.21 cm). The yield in the variants treated with alginite solutions significantly
            exceeded the control by 316.53–327.71 g per one tomato bush.
                  It was found that alginite solutions at a concentration of 0.1–1.0 % had low ovicidal (2.73–
             13.19 %) and insecticidal (5.0–33.3 %) effects against insects belonging to different orders –
             Leptinotarsa decemlineata  (Coleoptera), Galleria mellonella  (Lepidoptera) and  Halyomorpha
             halys (Hemiptera). Alginite solutions did not have contact insecticidal activity; the death of
             insects  was  caused  mainly  by  the  consumption  of  treated  feed.  At  the  same  time,  a  high
             antifeedant effect was revealed from 45.0 to 85.0 % against adults and larvae of 2–3 instars of
             L. decemlineata and larvae of 2–3 instars of G. mellonella. To conclude, the application of alginite
             contributed to an increase in seed germination and plant productivity, and it did not have a
             significant negative effect on the insect.

            Keywords: alginite, seeds germination, plant growth, yield, insect biological activity.
            Acknowledgments
            The authors are grateful to the Ministry of Education, Science, Research and Sport of the Slovak Republic
            for supporting by two grants the researcher’s mobility within the Bilateral scholarship program for
            2019–2020.







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             5 International Scientific Conference Agrobiodiversity for Improving the Nutrition, Health, Quality of Life and  |48
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