How to mix fertilizers and pesticides
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July 12 13:04:21, 2025
Mixing alkaline fertilizers like ammonia and wood ash with certain pesticides—such as trichlorfon, dimethoate, methamidophos, carbendazim, thiophanate-methyl, and pyrethroid insecticides—can significantly reduce their effectiveness. This is because the alkaline nature of the fertilizers can degrade the active ingredients in the pesticides, making them less potent over time.
Similarly, alkaline pesticides such as lime sulfur, Bordeaux mixture, and rosin-based formulations should not be mixed with ammonium-based fertilizers like ammonium bicarbonate, ammonium sulfate, ammonium nitrate, or ammonium chloride. They should also be kept away from calcium superphosphate. Doing so can lead to the release of ammonia, which reduces fertilizer efficiency and may even harm plants.
Pesticides containing arsenic, such as calcium arsenate and aluminum arsenate, should not be combined with potassium or sodium salts found in some fertilizers. This is because the combination could result in the formation of soluble arsenic compounds, which are toxic to plants and may cause phytotoxic effects.
When it comes to microbial pesticides like acaricidal bacteria or green worm preparations, they should not be mixed with highly volatile or corrosive chemical fertilizers. The harsh chemicals can kill the beneficial microorganisms, reducing the effectiveness of the biological control agents and leading to poor pest management results.
In general, it's important to carefully consider compatibility when mixing fertilizers and pesticides. Proper handling and storage can prevent unwanted reactions, ensure better crop protection, and maintain the health of your plants. Always refer to the product labels and consult with agricultural experts if you're unsure about safe combinations.