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Abstract

Electrolyzed fertilizer solution (EFS) was produced by passing an irrigation solution through an electrolization chamber in order to suppress fungal disease caused by Fusarium oxysporum f. sp. cubense race 4 (Foc4) infecting banana plantlets. In the laboratory, EFS was prepared by electrolyzing solutions containing different amounts of potassium chloride and potassium nitrate. The results indicated a significant reduction in the conidial densities of Foc4 which was from 10 6 spores · ml –1 to a maximum of 10 1.3 spores · ml –1 and depended on the concentration of components in the input flow. Eventually the EFS produced from the lowest one was chosen to treat banana plantlets. Greenhouse experiments gave contradictory results of inoculated plantlets irrigated with or without EFS. The untreated banana plantlets virtually showed symptoms of infection such as discoloration of cross-cut corms, rapid wilting and dying within 60 days, while the treated ones kept their shapes and grew normally. The drastic fall in the microbial population in the rhizosphere of treated plants confirmed the activity of oxidation agents which is the major mechanism of disease suppression. The results suggest that further studies of EFS in the field as a potential technique in fighting Panama wilt in the banana industry are necessary.
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Authors and Affiliations

Vu Anh Nguyen
1
ORCID: ORCID
Ha Van Nguyen
2
Phai Duy Do
3
Hung Ngoc Tran
4

  1. Department of Environmental Physico-Chemistry, Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
  2. Department of Technology Application and Transfer, Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
  3. Central Analytical Laboratory, Soils and Fertilizers Research Institute, Hanoi, Viet Nam
  4. Department of Biotechnology, Fruit and Vegetable Research Institute, Hanoi, Viet Nam
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Abstract

Solar energy is widely available in nature and electricity can be easily extracted using solar PV cells. A fuel cell being reliable and environment friendly becomes a good choice for the backup so as to compensate for continuously varying solar irradiation. This paper presents simple control schemes for power management of the DC microgrid consisting of PV modules and fuel cell as energy sources and a hydrogen electrolyzer system for storing the excess power generated. The supercapacitor bank is used as a short term energy storage device for providing the energy buffer whenever sudden fluctuations occur in the input power and the load demand. A new power control strategy is developed for a hydrogen storage system. The performance of the system is assessed with and without the supercapacitor bank and the results are compared. A comparative study of the voltage regulation of the microgrid is presented with the controller of the supercapacitor bank, realized using a traditional PI controller and an intelligent fuzzy logic controller.

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Authors and Affiliations

Pramod Bhat Nempu
N. Sabhahit Jayalakshmi

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