Numerical Estimation of Agricultural Raised Bed Microwave Disinfection

Casu, Sergio; Fanti, Alessandro; Lodi, Matteo Bruno; Spanu, Michele; Desogus, Francesco; Mazzarella, Giuseppe

doi:10.1029/2018rs006539

Cited by 11 publications

(4 citation statements)

References 45 publications

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“…The temperature distribution of deeper sites (for example, 5–10 cm in this study) depends on heat conduction and during conduction heat lost to the atmosphere causes cooler and hotter spots (i.e., inconsistency in soil heating) in the lower penetration depth, as detected in the microcosm of the present study (Figure S4). Relevant to this, Casu et al (2018) presented a one‐dimensional transmission‐line model to predict the feasibility of MW soil treatment for disinfestation purposes in raised‐bed agricultural systems. Their simulation represented the time required to attain the lethal temperature and its retention in the soil against various penetration depths to eradicate pathogens.…”

Section: Discussionmentioning

confidence: 99%

Impact of microwave disinfestation treatments on the bacterial communities of no‐till agricultural soils

Khan

Jurburg

et al. 2019

European J Soil Science

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Growing herbicide resistance has encouraged the development of new technologies for weed control. Microwave (MW) heating of soil before sowing has been shown to reduce weed establishment in no-till farming systems and substantially increases crop productivity. However, the effect of this technology on the soil microbial community in general, and on beneficial soil microbes such as ammonia oxidizers in particular, warrants further study. In order to check the effect of MW soil disinfestation treatments on the soil biota, indigenous soil microcosms were treated under a horn antenna of the MW prototype for three distinct durations. Immediately after heating (T0) and 28 days after heating (T28) the soil was collected at two penetration depths (0-5 and 5-10 cm) of MW energy to determine the bacterial community responses based on 16S rRNA amplicon sequencing and the total abundances of bacteria and ammonia oxidisers with qPCR. Although total bacteria and ammonia oxidizer abundances exhibited no response to the MW treatments, bacterial community composition differed according to the treatment durations. Community responses clustered into two categories: no effect at low heating intensities (0 and 30 s, 17-45 C) and strong effect at high heating intensities (60 and 90 s, 65-78 C). For the latter group, community richness did not recover to its preheating levels within the 4 weeks studied. Immediately after high heating intensity treatments, the relative abundance of Firmicutes increased and that of Proteobacteria decreased significantly regardless of penetration depth. The relative abundances of beneficial soil microbes (Micromonosporaceae, Kaistobacter and Bacillus) were significantly higher as soils recovered from high heating intensities compared with untreated soils at T28. Our findings suggest that although presowing MW treatments alter the soil microbial community, beneficial soil microbes exhibit faster recovery. Highlights

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Section: Discussionmentioning

confidence: 99%

Impact of microwave disinfestation treatments on the bacterial communities of no‐till agricultural soils

Khan

Jurburg

et al. 2019

European J Soil Science

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“…In order to verify the feasibility of microwave disinfection, Casu et al [97] analyzed the microwave heating of the soils of bed cultivations within a greenhouse; the results showed that microwave disinfection was applicable to different planting patterns, and was also effective for soil-borne pests. Sun et al [98] experimented on the effect of the output power of the microwave, the treatment duration, and the soil humidity on the soil temperature.…”

Section: Physical Soil Disinfectionmentioning

confidence: 99%

Development Status and Perspectives of Crop Protection Machinery and Techniques for Vegetables

Wang

Xue

2022

Horticulturae

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Diseases and pests are important factors in vegetable cultivation; they not only affect the growth and appearance of vegetables but also affect the yield and quality. The disease and pest control of vegetables is dominated by chemical sprays, for now. As a result, the excessive use of pesticides has been a crucial factor of pesticides’ non-point source pollution, and it is also the main cause of excessive pesticide residues in vegetables. Therefore, the design of efficient plant protection machinery and technology has become an urgent demand in order to ensure the quality and safety of vegetables. In this review, the machinery and technologies for vegetable protection are introduced from the aspects of chemical control and physical control. In the aspect of chemical control, handheld sprayers, self-propelled or track sprayers, fixed-pipe spray systems, vertical and horizontal boom sprayers, unmanned aerial vehicles (UAVs) and vegetable seed treatment techniques are introduced. In the aspect of physical control, soil physical disinfection, pest trapping technologies and ozone sterilizers are introduced. Finally, the existing problems and perspectives of pesticide application sprayers and physical control equipment for vegetables are summarized. This paper can provide references for vegetable growers and researchers.

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“…At radio and microwave frequencies, ionic conduction and dipole rotation are the dominant loss mechanisms [39]. In addition to the material ionic conductivity and dipole rotation ability, permittivity depends on the material composition [28] and texture [40], and to a lesser extent on pressure [41]; however, the parameters that mainly affect this variable are frequency and temperature [41]. The frequency influence, in the case of pure liquids, is described by the Debye model [42], where the relaxation time of the material is also taken into account.…”

Section: Elements Of Dielectric Theorymentioning

confidence: 99%

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

et al. 2020

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Microwave heating offers a lot of advantages compared to conventional heating methods in the chemical reactions field due to its positive effects on reaction time and selectivity. Dielectric properties, and in particular permittivity, of substances and mixtures, are important for the optimization of microwave heating processes; notwithstanding this, specific databases are poor and far from being complete, and in the scientific literature very little data regarding these properties can be found. In this work, impedance measurements were carried out using a specially designed system to get the real and imaginary parts of the dielectric constant. The apparatus was tested in the estimation of permittivity of water–ethanol and water–NaCl mixtures, varying their composition to obtain a wide range of permittivity values. The results were compared to literature data and fitted with available literature models to verify the correspondence between them, finding that permittivity dependence on mixture composition can be effectively described by the models.

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Numerical Estimation of Agricultural Raised Bed Microwave Disinfection

Cited by 11 publications

References 45 publications

Impact of microwave disinfestation treatments on the bacterial communities of no‐till agricultural soils

Impact of microwave disinfestation treatments on the bacterial communities of no‐till agricultural soils

Development Status and Perspectives of Crop Protection Machinery and Techniques for Vegetables

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

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