The overall spray water quality may have significant impact on application spray results regardless of significant quality commitment of crop protection products and sprayers’ manufacturers.
Crop protection products are manufactured, packed and delivered to the market under well controlled environment and the latest application sprayers technologies are designed and manufactured to improve spray quality and efficiency.
Nevertheless spray water represents more than 95% volume of any spray solution in sprayers’ tanks and an interaction among crop protection products and spray water may significantly influence final spray results.
The main spray water quality variables influencing pesticides treatment results are:
- pH (pesticides are designed and formulated for neutral or slightly acid spray
- water when the products used to perform the best)
- hardness (water hardness is caused by cations of Ca ++ , Na + , Mg ++ , K + and Fe ++/+++ and may cause deactivation of water hardness prone herbicides e.g. a.i. glyphosate)
- alkalinity (alkalinity refers to carbonate and bicarbonate levels in water)
- turbidity (turbidity is caused by suspended solids, soils, or organic matter which can significantly reduce the effectiveness of herbicides e.g a.i. glyphosate)