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Fertilizers should be used carefully to avoid chemical reactions that can reduce their effectiveness. For example, farmyard manure should not be mixed with alkaline fertilizers like wood ash, lime nitrogen, or calcium magnesium phosphate. This is because human and animal urine contains a lot of nitrogen, and when combined with strong alkaline substances, it can neutralize the nitrogen, making it unavailable for plants.
Similarly, superphosphate should not be mixed with alkaline materials such as grass ash or lime nitrogen, as this can decrease the availability of phosphorus. Insoluble phosphate fertilizers like rock phosphate or bone meal also shouldn’t be combined with alkaline substances, as they become even harder to dissolve, preventing plants from absorbing them properly.
Alkaline fertilizers, such as calcium magnesium phosphate, should not be mixed with ammonium-based nitrogen fertilizers like ammonium bicarbonate, ammonium sulfate, or ammonium chloride. This combination can increase ammonia volatility, which reduces the overall efficiency of the fertilizer.
Uncomposted farmyard manure should not be mixed with ammonium nitrate. Since raw manure needs time to decompose before it can be used by crops, mixing it with ammonium nitrate may cause nitrogen loss during decomposition, reducing the effectiveness of both the manure and the fertilizer.
Lastly, chemical fertilizers should never be mixed with bacterial fertilizers, such as those containing rhizobia. Chemicals can be corrosive, volatile, or hygroscopic, which can kill or inhibit the beneficial bacteria in biological fertilizers, making them ineffective. Always apply these types of fertilizers separately to ensure maximum benefits for your crops.
October 08, 2025