Spray deposition of an optimised Canopy Density Spraying boom design in a bed-grown crop

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The reduction of the emission of plant protection products (PPP) to the environment is an important issue when applying agrochemicals in the Netherlands. Apart from spray drift reduction, more attention is nowadays paid on use reduction as the combination of both means higher levels of emission reduction of PPP, as the amount of spray drift is from a less PPP used. With more precise application methods applying PPP only to the areas where it is needed, the plant, this can be achieved. Canopy Density Spraying (CDS) was therefore used under practical conditions in onions. To show the differences between a CDS-sprayer and a standard application technique, spray deposition measurements were done (following ISO24253-1/2) in three different crop growth stages of an onion crop. The CDS-sprayer was a Homburg Sensispray2.0 based on a Hardi Twin air sleeve boom sprayer with a working width of 5.4 m (three beds of 1.80 m onions) at 30 cm nozzle height. Based on Greenseeker sensors measurements of vegetation index (NDVI), spray volume was adjusted using three nozzles mounted in a Lechler Varioselect nozzle body, switched on or off individually or jointly. Angling of the air sleeve and nozzles towards the crop rows on the bed improved spray deposition compared to a horizontal spray boom and nozzle orientation. In three growth stages spray deposition on the onion leaves was for the CDS spray technique 1.5 to 2.8 times higher compared to that of the standard air-assisted sprayer. Loss to soil surface on top of the bed and on the paths in between the beds was for the CDS sprayer lower than for the standard. Spray deposition above the crop rows was for the CDS sprayer higher than of the standard.
Original languageEnglish
Title of host publicationInternational Advances in Pesticide Application
EditorsP. Balsari, C.B. Ellis, S. Cooper, E. Gil, R. Glass, B. Magri, C. Mountford-Smith, D. Nuyttens, T. Robinson, J. Thomas, J. van de Zande
Place of PublicationWarwick
PublisherAssociation of Applied Biologists
Publication statusPublished - Jan 2020

Publication series

NameAspects of Applied Biology
ISSN (Print)0265-1491


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