Comparison between novel and traditional spray application techniques in strawberries D. NUYTTENS, P. BRAEKMAN & D. FOQUE Institute for Agricultural and Fisheries Research (ILVO) – Technology & Food Science Unit – Agricultural Engineering Burg. Van Gansberghelaan 115, bus 1, 9820 Merelbeke (BELGIUM) Research questions v Can spray boom systems improve the spray results in a strawberry crop compared with the traditional spray gun? v What is the effect of nozzle type and setting on spray boom deposition results? Materials and Methods v Spray application techniques v Elsanta strawberry crop 3 -nozzle vertical spray boom Ø Average height ± 0. 40 m Ø Growth stage: end of fruit production Ø Approx. 8300 running metres ha-1 v Canopy spray deposition measurements Ø Mineral chelates (Fe, Co, Cu, Mn, Mo, Zn; 100 mg L-1) • • Same collectors for the different applications Analysis: Inductively Coupled Plasma (ICP) VMD: Volume median droplet diameter vvol 50: Average droplet velocity Ø Deposition measurements • • were normalised to a concentration of 100 mg L-1 in the tank and an application rate of 1000 L ha-1 ground surface are expressed as relative values (%) compared to the maximal feasible deposition, assuming a perfectly uniform distribution of the spray liquid on the contours of the crop canopy Ø Filter paper collectors (7. 6 x 2. 6 cm²) • • • Three collectors on the crop canopy → spray distribution Two inside the crop → crop penetration Five plants were selected as repetitions Handheld spraygun application Results and discussion v Deposition (%) on the crop contours for the ≠ collector positions Ø Significant effect of collector position on deposition (2 > 3 > 1) Ø Important variability of the deposits measured at each sample point v Deposition (%) on the inside of the crop for the ≠ collector positions Ø Significant effect of collector position on deposition (4 > 5) → Deeper position in the crop Ø Important variability of the deposits measured at each sample point v Deposition (%) on the crop contours for the different techniques Ø Clear effect of spray system on deposition: boom ~22 -60% vs. gun ~20% Ø Difference most pronounced on top of canopy: boom 13. 1% vs. gun 4. 5% Ø Highest deposits with ID 12002, Albuz AVI-Twin 11002 & Tee. Jet XR 11003, all at their recommended working pressure of 6. 0, 6. 0 and 2. 5 bar v Deposition (%) on the inside of the crop for the different techniques Ø Deposition with gun was only significantly lower than boom for ID 12002 nozzle Ø Best crop penetration with the ID 12002 nozzle: big and fast droplets Ø Increasing spray pressure above the recommended one and spray angling did not improve penetration Conclusions v (automated) vertical spray booms are a valuable alternative for the traditional spray gun: operator exposure↓, labor-intensity↓, spray deposition and uniformity ↑ v Nozzle choice significantly affects spray deposition and penetration v Highest depositions with the air inclusion or extended range flat fan nozzles at their recommended spray pressure Reference: Braekman P, Foqué D, Messens W, Van Labeke M-C, Pieters J G, Nuyttens D. 2010. Effect of spray application technique on spray deposition in greenhouse strawberries and tomatoes. Pest Management Science. 66(2): 203 -212 www. ilvo. vlaanderen. be david. nuyttens@ilvo. vlaanderen. be +32 9 272 27 82
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