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dc.contributor.authorMay, William A.
dc.date.accessioned2016-07-25T00:17:18Z
dc.date.available2016-07-25T00:17:18Z
dc.date.issued1995
dc.identifier.urihttps://hdl.handle.net/10182/7170
dc.description.abstractA novel electrostatic spray nozzle, termed the Lektraspray Nozzle, was evaluated to assess its suitability for pesticide application in the greenhouse industry. The nozzle is based on the vortical nozzle principle, releasing the spray liquid into a low pressure/high volume airstream through a flexible emitter tube. The encompassing airstream shatters the liquid into small droplets and transports them to the target. The experimental work identified that the nozzle could deliver a droplet spectra with a Volume Median Diameter (VMD) of approximately 75 μm for a range of liquids and viscosities. Charging the droplets had a minor effect on the VMD, although typically improved the droplet spectra. The nozzle could be operated satisfactorily with or without electrostatically charging the droplets. The VMD could be changed simply by increasing/decreasing the liquid flow rate and/or adjusting the air pressure of the encompassing airstream. Small adjustments to the air pressure (4.5 to 14 kPa) will allow the production of an acceptable droplet spectra over a large range of liquid flow rates (30 to 1000 ml/min). The results of a limited number of tests using the Lektraspray nozzle on plants indicated that electrostatic charging could significantly influence the deposition of droplets on the underside of the leaves, providing the foliage was not "dense". However no significant increase in the total amount deposited on the plant was noted when the droplets were charged. The results from spraying a "dense" foliage plant (Pittosporum eugenioides) indicated the need to adjust the charge/air pressure relationship of the spray nozzle to increase underleaf deposition and improve droplet penetration into the plant canopy. After evaluating the experimental work on the Lektraspray nozzle, and considering the simplicity and ruggedness of the nozzle, the conclusion was that it should be seriously considered as an alternative spray application technique for use where controlled environment spraying is required. In particular - the greenhouse industry.en
dc.language.isoenen
dc.publisherLincoln Universityen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectspray irrigationen
dc.subjectpesticidesen
dc.subjectelectrostatic spray nozzleen
dc.subjectLektraspray Nozzleen
dc.subjectgreenhousesen
dc.subjectdroplet sizeen
dc.subjectdroplet spectrasen
dc.subjectirrigation efficiencyen
dc.titleThe Lektraspray Nozzle: A novel ultra low volume spray applicator for the greenhouse industryen
dc.typeThesisen
thesis.degree.grantorLincoln Universityen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Natural Resources Engineeringen
lu.thesis.supervisorMartin, Graeme
lu.contributor.unitLincoln Agritechen
dc.rights.accessRightsDigital thesis can be viewed by current staff and students of Lincoln University only. If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.en
dc.subject.anzsrc079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)en
dc.subject.anzsrc079902 Fertilisers and Agrochemicals (incl. Application)en


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