Temporal and spatial dimension of dissolved oxygen saturation with fluidic oscillator and Mazzei air injector in soil-less irrigation systems
| Autor: | Thomas Holmes, William B. Zimmerman, David J. Midmore, Surya P. Bhattarai, Hongjun Lei, R.J. Balsys |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Irrigation Environmental engineering Soil Science chemistry.chemical_element 04 agricultural and veterinary sciences Injector 01 natural sciences Oxygen law.invention Fluidic oscillator chemistry law Venturi effect 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Limiting oxygen concentration Aeration Saturation (chemistry) Agronomy and Crop Science 010606 plant biology & botany Water Science and Technology |
| Zdroj: | Irrigation Science. 34:421-430 |
| ISSN: | 1432-1319 0342-7188 |
| DOI: | 10.1007/s00271-016-0512-x |
| Popis: | The wider scale use of aerated water for irrigation has been limited by dis-uniformity of aeration in the field, limited longevity of oxygen in irrigation water and lack of knowledge of what oxygen concentration brings optimal growth. Two options are presented for increasing dissolved oxygen (DO) in irrigation water: Venturi (VT) and fluidic oscillator (FO) aeration systems. Sweet corn was grown in pots to evaluate the effect of aerated water. Compared to the control treatment (CK), VT and FO showed an increase in irrigated water DO in the irrigation tank and feeding pots after aeration. Incorporation of surfactant in the irrigation water significantly improved DO level for the VT and FO treatment. Typically the DO levels reached a peak when the pump is turned off and then decline to a minimum after 24 h. The VT and FO systems had a higher magnitude and duration of the DO level in the water in all treatments compared to the CK system. The FO aeration maintained the longest duration of elevated DO in the water by a factor of two compared to the VT aeration. Compared to the CK, the best result on longevity and DO concentration was achieved using 4 ppm of a non-ionic surfactant. The corn biomass was significantly greater for the VT compared to both the FO and CK treatments. |
| Databáze: | OpenAIRE |
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