Abstract
The investigation about surface tension of water used for preparation of pesticide solutions reveals it is quite diverse and changeable without any logical correlation towards location, time, and type of water source. Moreover, spraying with solutions with lower surface tension give bigger flow rates due to the lower resistance of fluid to the nozzles. The conducted trials show that plant surfaces with more rough texture require to be sprayed with pesticide solutions with lower surface tension. The wax content of the surfaces has no significant impact on surface tension requirement.
Highlights
Using of pesticide solution with low surface tension is crucial for achievement of satisfactory level of pesticide effectiveness (Crease & Thacker, 1991; Ellis et al, 2001,)
Just like river and tap water samples, the results show absolutely changeable and unpredictable surface tension values for lake
The difference is obvious - the same sprayer with the same nozzle adjusted to a constant position and sprayed droplets with the same size but with solutions with different surface tension achieved different flow rates
Summary
Using of pesticide solution with low surface tension (good wetting ability) is crucial for achievement of satisfactory level of pesticide effectiveness (Crease & Thacker, 1991; Ellis et al, 2001,). If the surface tension is too high (wetting ability – too low), pesticide solutions will be at the form of drops on the sprayed surfaces (they will not cover all surface and can be dropped down) on one hand and they will not penetrate fully in the rough surfaces from the other. Different surface tension means different flow rates and respectively different sprayed dose rates (Matthews, 2008)
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