## 1 Introduction
The antimicrobial properties of plasma are used wherever the use of high temperatures for decontamination is not advisable due to the thermolability of sterilized materials. In low-temperature applications, non-equilibrium plasmas can be used, where the local electron temperatures are much higher than the temperatures of the ions and neutral particles. Therefore, non-equilibrium plasma is successfully applied in the medical field to sterilize surgical and dental instruments and also as an aid in the treatment of hard-to-heal wounds [21]. Plasma has also been used for many years in environmental protection for the treatment of water, wastewater, production liquids and soil [22; 23; 24], neutralization and stabilization of municipal waste, and for the removal of waste gases [17; 25]. Non-equilibrium plasma is used in the food industry when it is necessary to remove or eliminate microorganisms from packaging or preserved foods and to extend the shelf life of foods such as juices and meat [17; 26]. Its decontaminating and stimulating properties have been reflected in various studies in the field of agriculture, e.g., for accelerating seed germination or plant conditioning [27; 28; 29; 30; 31; 32; 33; 34]. In order to lower the temperature of the process, systems operating under reduced pressure can be used, allowing for the generation of plasma with a relatively large volume and a uniform shape of the discharge [35; 36; 37; 38; 39]. The main disadvantage of these solutions are the limitations related to the vacuum chamber, in which the treated object must be placed--it is very difficult to process large-sized or complex-shaped materials here. The use of a vacuum is also associated with additional costs and a larger size for the entire system. In the case of atmospheric plasma, temperature reduction is possible, for example through the use of noble gases in combination with a dielectric barrier or indirect plasma treatment. In the latter case, the workpiece is not in direct contact with the plasma but with the active particles generated in it, which reach its surface with a stream of gas or another medium (e.g., water--so-called plasma-activated water). An example of an indirect plasma treatment system is a gliding arc discharge (GAD) reactor. The discharge created is in the form of an arc, that, as a result of gas-dynamic forces, moves along outwardly curved electrodes. The discharge is extinguished when the electrical energy supplied from the power source is unable to compensate for the energy losses of the elongated arc column. Once the discharge is extinguished, it is almost immediately restored in the ignition zone and the reactor cycle repeats. One of the greatest advantages of reactors of this design is the ability to operate them using atmospheric air as the working gas, which significantly reduces the cost of treatment. For example, [PERSON] et al. used a glide arc reactor as a pretreatment to the hot-air-drying of grapes, obtaining samples with better color as well as decreased total phenol content, antioxidant activity and vitamin C losses in the dried grapes [40]. In the work of [PERSON] et al. [41], the reactor was used to treat wheat, which allowed increased germination. In the work of [PERSON] et al. [41], the reactor was used to treat of Maize (_Zea mays_ L.), which allowed stimulation of seed germination (to 141%), root length (to 221%), shoot length (to 298%) and root weight (to 122%). The influence of the treatment on maize physiology was strictly dependent on its time, which could either decrease or increase such parameters as abscisic acid, jasmonic acid, jasmonate isoleucine and active cytokins [41]. The reactor was also used in PAW processing, e.g., to remove _Staphylococcus aureus_, _Escherichia coli_ and _Candida albicans_ in tap water [42], as well as remove _Escherichia coli_, _Staphylococcus aureus_, _Pseudomonas aeruginosa_ and _Proteus mirabilis_ inoculated to shrimp (in vivo condition) and shrimp agar (in vitro condition) [43].