Plasma agriculture based on quantitative monitoring of reactions between fungal cells and atmospheric-pressure plasmas

Recently, application of plasma technologies to the agricultural field has attracted much interest because residual pesticides and excessive nitrogen oxides contained in plants, soil, and groundwater have become a serious issue worldwide. Since almost all of the atmospheric discharge plasma generates ozone, the effects of ozone are among the key factors for their agricultural applications. We have proposed the use of ozone generated using surface barrier discharge plasma for soil disinfection or sterilization. In this work, the ozone consumption coefficient and diffusion coefficient in soil were measured by the ultraviolet absorption method. The pH(H2O) and amount of nitrogen nutrient in soil after ozone diffusion treatment were studied and plant growth was observed simultaneously. The effect of ozone treatment on the amount of DNA in soil was also investigated and compared with that determined from the obtained ozone consumption coefficient.

Section: Introductionmentioning

confidence: 99%

Study on ozone treatment of soil for agricultural application of surface dielectric barrier discharge

Nagatomo

Abiru

Mitsugi

et al. 2015

“…Atmospheric pressure plasma has been used for the inactivation of P. digitatum spores, [19][20][21] and some studies speculated that reactive oxygen species are much more efficient during the inactivation process rather than ozone or UV radiation. [22][23][24] Moreover, previous studies considered that O and •OH play important roles in inactivating cells and causing cell lysis via the oxidation of bacterial components. 25) Reference 26 investigated the antimicrobial effect of Ar and Ar/water APPJ.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of germination inhibition after treatment of an air-water plasma jet: the effect of pulsating DC power

Liu¹,

Deng²,

Jiao³

et al. 2019

Pulsating direct current (PDC) power consisting of AC power and a diode connected in series was adopted to produce an atmospheric pressure plasma jet. The PDC power is a high-voltage half-wave rectified AC power. During the experiments, the gas temperature of the PDC plasma was in the range of 45.0 °C–59.7 °C. P. digitatum spores spread on a glass slide were directly treated by the plasma plume and a germination inhibition rate was adopted to evaluate the inhibition efficiency. In order to ensure that the plasma plume touched as many spores as possible, the glass slide was fixed on a programmable 3D mobile platform and moved in a zigzag path during the treatment process. The maximum germination inhibition rate reaches 0.701 by the PDC plasma jet at a discharge current of −7.5 mA and water content of 9.58 mg l−1.

“…The irradiation with active oxygen species generated by barrier discharge is expected to provide an alternative method for sterilizing agricultural products. [12][13][14][15][16] Active oxygen species produced by plasmas have relatively short lifetimes, on the order of ms, and do not remain on the surface of agricultural products. Therefore, active oxygen species would enable safe and reliable sterilization of agricultural products.…”

Section: Introductionmentioning

confidence: 99%

Sterilization characteristics of the surfaces of agricultural products using active oxygen species generated by atmospheric plasma and UV light

Hayashi

Yagyu

Yonesu

et al. 2014

Agricultural products were sterilized by irradiation with active oxygen species produced by the combination of atmospheric plasma and UV light in ambient air. It was found that the surfaces of rice and lemons are sterilized after 20 min of irradiation. After the irradiation, the mold spores on the surface, although still viable, become unculturable. Treatment speed using the active oxygen species is higher than that using plasma or UV light alone. Infrared light spectra of the fruits surface indicate that there is no significant damage to the exocarp caused by the active oxygen species.