What is DAP Fertilizer?

Discover the benefits of DAP fertilizer, a blend of nitrogen and phosphorus, for enhancing crop quality, with tips on usage and considerations for effective results.

Table of Contents

DAP or Diammonium phosphate is a complex fertilizer that is widely used because of its balanced nutrient content and versatility. It has a solid granular form (small round pellets), and the best part is that many industry experts recommend its usage for better yield and cost-cutting. And that’s what makes it even more interesting to know about, so let’s discuss what DAP fertilizer is. 

Composition of DAP fertilizer 

Composition of DAP fertilizer

Nitrogen (N) and Phosphorus (P) are the two most important macronutrients that support plant growth. In a DAP fertilizer, these are present in the form of ammonium nitrogen and phosphate ions. Let’s examine its composition in detail. 

Ammonium Nitrogen 

Ammonium cation (NH4+) makes up 18% of the total composition of DAP fertilizer. Generally, nitrate is the preferred source of nitrogen for plant uptake, and ammonium is easily converted into it (during nitrification). The ammonium form of nitrogen provides a dynamic supply and balanced nutrient profile essential for plant growth.

Phosphate Ions 

Phosphate ions makeup 46% of the DAP fertilizer and can promote cell division, flowering, and water solubility. This is because plants need Phosphorus in almost every stage, right from root development to cell division and even flowering. 

Advantages of Diammonium Phosphate fertilizer

Here are some of the advantages of using DAP fertilizers. 

Improved crop quality

The sufficient supply of N and P in DAP ensures a strong root system and a better nutrient uptake. Moreover, an adequate amount of Phosphorus enhances the stress tolerance of the plant, which eventually helps farmers achieve quality crops. 

Ease of usage 

Because of its granular form, it is easy to handle, measure, and broadcast. The farmers can even ensure its uniform application by using simple equipment such as spreaders. Hence, it does not require complex or expensive equipment for application. 


DAP or (Nh4) 2HPO4 fertilizers can be used for different types of crops, such as rice, tomato, potato, etc., and even for varying soil types. Eventually, this versatility helps farmers lower their expenditure in buying specific fertilizers for each crop individually. Additionally, the DAP fertilizers are stable at room temperature and are less likely to lose their potency while they are stored for 6 months at least.  

Considerations while buying a DAP fertilizer

Considerations while buying a DAP fertilizer

  • Check whether specific N and P requirements of the crop match those in the fertilizer. For instance, choosing a DAP with high P-content could negatively impact a crop that needs it in fewer amounts. 
  • Make sure your fertilizer is pure and void of any contaminants. 
  • Avoid overapplying DAP fertilizers to the fields, as it may lead to nutrient imbalance. 
  • Both acidic and alkaline soils react to DAP in different ways. Hence, before choosing the DAP fertilizers, make sure to check the pH of your soil. 

Parting comments 

In conclusion, DAP fertilizers play an important role in plant growth by providing them with necessary nutrients in the right proportions. Even some shreds of evidence support N and P’s synergistic effect in improving the overall growth of crops. However, when choosing the right DAP fertilizer for operations, aspects such as cost, soil type, pH, and crop requirement must be considered carefully. 

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