5/31/2023 0 Comments Spraying golf greens overloop![]() The cations that can cause the most trouble for pesticides include: Water hardness above 250 to 350 parts per million (ppm) (calcium carbonate – CaCO3 equivalents) should be treated before adding weak acid herbicides. Example of weak acid herbicides include glyphosate and amine formulations of 2,4-D, MCPA, 2,4-DB, clopyralid and diflufenican. Extreme cases can lead to the herbicide settling out in the spray tank or most commonly reducing the ability of the active ingredient to be absorbed through the plant leaf. ![]() Calcium and magnesium ions have positive electrical charges that enable them to bind with negatively charged products such as ‘weak acid’ herbicides in solution making them less soluble. ![]() Water that is considered hard has high levels of calcium, magnesium or bicarbonate ions. The two that cause the most confusion are hardness and pH. However, there are a range of water quality variables unseen to the naked eye that can affect certain pesticide formulations. ![]() Obviously, water that is free of suspended materials such as clay, algae and other debris will block filters and possibly nozzles which makes spraying very frustrating. It is surprising however to find that very few growers have had water quality tested. The quality of water being used in the spray tank to act as the carrier for your pesticides can have significant effects on how well those pesticides will work. ![]()
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