You are using an outdated browser. For a faster, safer browsing experience, upgrade for free today.

DAP fertilizer (Diammonium phosphate) it’s a kind of Phosphates (phosphatic fertilizer), a widely used and versatile fertilizer in modern agriculture. It is highly valued for its balanced nutrient composition, convenience, and effectiveness in promoting plant growth and productivity. This article will discuss the details of DAP fertilizer, exploring its definition, composition, production process, benefits, application methods, timing, numerical representation, longevity in the soil, pH nature, and considerations for its usage. Additionally, it highlights KMKA Co.’s products and its ability to provide support to DAP producers.

What is DAP fertilizer?

DAP fertilizer, short for diammonium phosphate, is a compound fertilizer that combines two essential nutrients: nitrogen (N) and phosphorus (P). It comprises ammonium ions (NH4+) and phosphate ions (PO43-). DAP fertilizer is widely used due to its high nutrient content and balanced nitrogen-to-phosphorus ratio.

DAP Composition

DAP fertilizer is characterized by its high nitrogen and phosphorus content. Typically, it contains around 18-21% nitrogen and 46-53% phosphorus. The nitrogen component provides plants with an easily accessible source of this vital nutrient, while the phosphorus content supports various plant functions such as root development, energy transfer, and flowering.

What number is DAP fertilizer?

DAP fertilizer is represented by an NPK ratio, which indicates the percentage of nitrogen (N), phosphorus (P), and potassium (K) it contains. DAP typically has an NPK ratio of 18-21-0, signifying the percentage of nitrogen, phosphorus, and potassium, respectively.

Production Process

DAP fertilizer is produced through a chemical reaction between ammonia (NH3) and phosphoric acid (H3PO4). The reaction results in the formation of diammonium phosphate [(NH4)2HPO4]. This compound is further processed to obtain DAP granules, which are more convenient for handling, storage, and application.

Benefits of DAP Fertilizer

Balanced Nutrition: DAP fertilizer supplies both nitrogen and phosphorus, ensuring a balanced nutrient intake for plants. This promotes overall growth, enhances root development, and supports reproductive processes.
Rapid Nutrient Uptake: The ammonium nitrogen in DAP is readily available for plant absorption, facilitating quick nutrient uptake and utilization.
Phosphorus Enrichment: DAP serves as an effective source of phosphorus, which is essential for energy transfer, cell division, and promoting early root development.
Increased Crop Productivity: By providing essential nutrients, DAP fertilizer contributes to improved plant health, resulting in higher crop productivity and quality.

Application Methods

DAP fertilizer can be applied using various methods, including:
Broadcasting: Sprinkling the granules uniformly over the soil surface.
Side-Dressing: Applying the fertilizer in a band alongside plant rows during specific growth stages.
Seed-Row Placement: Placing the fertilizer in the planting row during sowing.
Fertigation: Dissolving DAP in water and applying it through irrigation systems.

Applying DAP Fertilizer

When should DAP fertilizer be applied?

The timing of DAP fertilizer application depends on the crop and its growth stages. In general, DAP is often applied before or at the time of planting to provide essential nutrients for initial plant establishment. However, for crops with longer growing seasons, split applications may be considered, with a portion applied at planting and the rest during active growth phases.

How long does DAP stay in the soil?

The persistence of DAP fertilizer in the soil depends on various factors, including soil conditions, microbial activity, and crop uptake. Generally, DAP gradually releases its nutrients over several weeks to a few months. However, the availability and longevity of DAP in the soil can be influenced by factors such as soil pH, temperature, moisture, and organic matter content.

Is DAP fertilizer acidic or alkaline?

DAP fertilizer tends to be slightly acidic. When applied to the soil, it can lower the soil pH temporarily. This temporary acidity can benefit certain crops that thrive in slightly acidic conditions. However, it is crucial to monitor soil pH levels and make necessary adjustments to maintain optimal nutrient availability for plant uptake.

Considerations for Usage:

When using DAP fertilizer, it is important to consider:

Soil Testing: Conduct soil tests to determine nutrient requirements and ensure appropriate application rates.
Environmental Impact: Following recommended application rates to prevent excess nutrients from leaching into water bodies and causing pollution.
Safety Measures: Adhering to safety guidelines provided by the manufacturer, such as wearing protective gear during application.

The Importance of Phosphate Suppliers

Phosphate rock suppliers, such as KMKA Co., play a critical role in the production of DAP fertilizer. These suppliers provide the essential raw material, phosphate rock, which serves as the primary source of phosphorus in the production process. Their expertise and commitment to quality ensure a reliable supply of phosphate to DAP producers, contributing to the availability and sustainability of DAP fertilizer in the agricultural industry.

According to our reserves of Phosphate, and our logistics, we can feed your esteemed company with high-grade rock phosphate. Just open your email and reach us by an inquiry…


DAP fertilizer, with its balanced nitrogen-phosphorus composition, offers significant benefits to plant growth and crop productivity. By understanding its definition, composition, production process, benefits, application methods, timing, numerical representation, longevity, acidity/alkalinity, and considerations for usage, farmers can effectively utilize DAP fertilizer to optimize plant nutrition and achieve sustainable agricultural practices.