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Aplikacijska tehnika ima velik vpliv na učinkovitost delovanja fitofarmacevtskih sredstev (FFS) za zatiranje škodljivih organizmov na čebuli. Na tem področju nimamo veliko informacij, še posebej glede vpliva tehnike na zmanjševanje zanašanja FFS. Izvedli smo poljski poskus, v katerem smo preučevali vpliv parametrov aplikacije in dodajanja močila Break Thru® (kopolimer tri-siloksana) na oblikovanje depozita škropilne brozge na površju listov čebule. Značilnosti depozita smo prikazali z uporabo testnih lističev, občutljivih za vodo (angl. WSP), in z meritvami koncentracije barvila tartrazin (E102), izluženega iz filtrirnega papirja ter s površja listov čebule. Aplikacijo škropilne brozge smo izvedli s standardno poljedelsko škropilnico, umerjeno na porabo vode 200 ali 400 l/ha. Testirali smo šobe TeeJet® XR 11002, 11004 TeeJet® Twin 60 11002, 60 11004 in TeeJet® Turbo Twin 60 11002 ali 60 11004. Statistična analiza je pokazala značilne razlike med depoziti barvila tartrazin, ki so jih različne šobe oblikovale na različnih delih zelenja čebule. Šoba TeeJet® Twin je deponirala značilno več barvila na listju čebule kot drugi dve testirani šobi. Povečanje porabe vode iz 200 l/ha na 400 l/ha ni značilno povečalo depozita barvila. Učinek dodajanja močila Break-Thru je bil pri različnih šobah različen in je povzročil povečanje depozita na različnih delih listov čebule. The application technique has a great influence on the effectiveness of the plant protection products (PPP) for the control of harmful organisms of onion. In this area, we have a large deficit of information, especially with regard to the impact of the technique for reducing the drift of PPPs. A field trial was carried out to test the effects of spray application parameters and the effects of adding Break Thru®, a trisiloksane based adjuvant, on the formation and retention of spray deposits on onion leaf surfaces. The characteristics of spray deposits were shown by using water sensitive papers (WSP) and by measuring the concentration of the tartrazine dye (E102) extracted from onion leaves. The spray application was carried out using a standard field boom sprayer set to deliver 200 or 400 l of spray per hectare. The nozzles TeeJet® XR 11002, 11004, TeeJet® Twin 60 11002, 60 11004 and TeeJet® Turbo Twin 60 11002 or 60 11004 were tested. Statistical analysis revealed a significant difference between nozzles in terms of the tartratzine deposit at different positions on the onion canopy. The TeeJet® Twin nozzle deposited significantly more tartratzine compared to the other two tested nozzles. The increase of spray volume from 200 to 400 l/ha did not increase the tartrazine deposit significantly. The effect of adding the adjuvant was different with each of the tested nozzles. It caused an increase of tartrazine deposits at different positions on the onion leaves. |
