There are two taboos when mixing fertilizers.
In order to achieve reasonable fertilization and improve fertilizer efficiency, farmers usually use fertilizers in combination. However, the effective components of each fertilizer are different. Some fertilizers will have a series of reactions after being mixed, which not only fails to improve the fertilizer efficiency, but also causes nutrient loss. Therefore, there are two taboos when mixing fertilizers:
Avoid chemical changes that cause nutrient loss. Ammonium nitrogen fertilizers cannot be mixed with alkaline fertilizers such as plant ash, lime, etc., otherwise it will cause nitrogen loss. Nitrate nitrogen fertilizer cannot be mixed with acidic fertilizers such as superphosphate, so as not to cause nitrate nitrogen to decompose into nitrogen oxides and cause nitrogen loss. Water-soluble phosphate fertilizers should not be mixed with alkaline fertilizers such as lime, plant ash, pit ash and potash fertilizer, so as to prevent the conversion of water-soluble phosphorus into insoluble phosphorus and reduce the effectiveness of phosphate fertilizer.
Avoid changes in physical properties. After mixing two kinds of fertilizers with stronger hygroscopicity, the mixture will have stronger hygroscopicity. For example, the mixture formed by mixing ammonium nitrate and urea has greatly enhanced moisture absorption and is easy to agglomerate. Therefore, the two should not be mixed. Another example is the mixed use of urea and superphosphate, although it can extend the time for urea to be converted into ammonium, but the crystal water contained in the superphosphate will be freed, which will increase the humidity of the fertilizer and make it easy to agglomerate. Therefore, the two should not be mixed.