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Enhanced seed germination and plant growth byatmospheric pressure cold air plasma: combinedeffect of seed and water treatmentL. Sivachandiranaband A. Khacef*aThe combined effect of non-thermal plasma treatment of water and seeds on the rate of germination andplants growth of radish (Raphanus sativus), tomato (Solanum lycopersicum), and sweet pepper (Capsicumannum) have been investigated using dielectric barrier discharges in air under atmospheric pressure androom temperature. A cylindrical double dielectric barrier discharge reactor is used for water activationand a plate-to-plate double DBD reactor is employed for seed treatment. The activation of water, for 15and 30 min, lead to acidic solutions (pHz3) with moderate concentrations of nitrate (NO3±) andhydrogen peroxide (H2O2). Plasma activated water (PAW) has shown a significant impact on germinationas well as plant growth for the three types of seeds used. Interestingly, the positive effect, in seedgermination and seedling growth, has been observed when the PAW and plasma-treated seeds (10 and20 min) were combined. In one hand, when the seeds were (tomato and pepper) exposed to 10 minplasma and watered with PAW-15 forfirst 9 days followed by tap water for 51 days, the stem length isincreased about 60% as compared to control sample. On the second hand, for longer exposures ofseeds and water to plasma discharges, a negative effect is observed. For instance, plasma-treated seedswatered with PAW-30, the plant growth and vitality were decreased as compared to control sample.These results revealed that the developed cold plasma reactors could be used to significantly improvethe seed germination as well as plant growth, nevertheless, the plasma treatment time has to beoptimized for each seeds.1.IntroductionAs reported by the United Nations Food and Agriculture Orga-nization (FAO), the global food shortages will become threetimes more likely as a result of climate change, fast develop-ment of industrialization and urbanization. Since, the culti-vable land is hard to increase, the only way to address the foodshortage is to increase the crop yield in an economically viableprocess. It is widely believed that by increasing the rate of seedgermination and plant growth, the world population food needscould be met. The major cause of low germination of seeds ofvarious plant is oen connected to the seed surface and soilcontamination with bacteria, microorganisms and fungi. Thetraditional methods used to improve the crop yield are; (i)fertilization, (ii) irrigation, however, both methods have asso-ciateddisadvantageslikeeconomicandenvironmentalproblems.1,2More recently, the innovative non-thermal plasma (NTP)technologyhasdrawnconsiderableattentionintheeldofagricultureandfoodpackagingasanalternative/complementary for stimulating plant growth and reducingpathogen/chemical contamination of seeds.

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Term
Fall
Professor
ChristopherMassone
Tags
The Land, Plasma, Paw

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