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Temporal and spatial dimension of dissolved oxygen saturation with fluidic oscillator and Mazzei air injector in soil-less irrigation systems

journal contribution
posted on 02.08.2018, 00:00 by Hongjun LeiHongjun Lei, Surya BhattaraiSurya Bhattarai, Ronald BalsysRonald Balsys, David MidmoreDavid Midmore, T Holmes, W Zimmerman
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.

Funding

Other

History

Volume

34

Issue

6

Start Page

421

End Page

430

Number of Pages

11

eISSN

1432-1319

ISSN

0342-7188

Publisher

Springer

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Sheffield, UK; North China University of Water Resources and Electric Power

Author Research Institute

Institute for Future Farming Systems

Era Eligible

Yes

Journal

Irrigation Science