Di-Ammonium phosphate (DAP) is the world’s most widely used Phosphorus fertilizer. It is made from two common constituents in the fertilizer industry – Nitrogen (N) and Phosphorus (P). It is relatively high in nutrient content and its excellent physical properties make it a popular choice in farming and other industries.
When applied as plant food, it temporarily increases the soil pH, but over a long term the treated ground becomes more acidic than before upon nitrification of the ammonium. It is incompatible with alkaline chemicals because its ammonium ion is more likely to convert to ammonia in a high-pH environment. The average pH in solution is 7.5 – 8. Di-Ammonium phosphate (DAP) contains 18% of Nitrogen, 46% of Phosphorus and no Potassium. DAP dissolves easily in water at 20 degrees Celsius.
- DAP fertilizer is an excellent source of Phosphorus (P) and Nitrogen (N) for plant nutrition
- It is highly soluble and thus quickly dissolves in to the soil to release Phosphorus and Nitrogen to plants
- Nitrogen content in DAP supports the photosynthesis process
- Phosphorous improves roots and flowers growth and development
- When applying DAP, the fertilizer should be banded 5cm away from the seed, either below or to the side. DAP is low in Sulphur – 1.5%. It is not recommended for high Sulphur-requiring crops such as canola, unless blended with Sulphate of Ammonia.
- DAP should not be mixed with any fertilizers containing Zinc as it forms Zinc Phosfide, which makes it inappropriate for plants.
- DAP can be applied for all field crops, grassland and in gardens and orchards. For the best effect DAP should be applied prior to sowing mixed with soil at the depth of ca. 20cm under the ground. It is recommended to use it in early spring mainly for winter crops.
- DAP gives optimal effects when applied with Potassium Chloride with which it can be mixed at any time. Directly before spreading it can be also blended with Urea, Ammonium Nitrate and CAN.