Fertilizers / DAP 18-46-0 / Uses
DAP fertilizer uses
Diammonium Phosphate Uses: DAP Fertilizer for Crops
DAP 18-46-0 is used in agriculture around the world. Its high phosphorus content supports early plant growth and root development, and its nitrogen supports healthy leaf growth. Here is where DAP is used, why phosphorus matters, and when and how DAP is applied.
- Cereals and rice
- Oilseeds and sugarcane
- Vegetables and fruit
Crops
Common uses of DAP fertilizer
DAP 18-46-0 is used on a wide range of agricultural crops. It is especially common in winter cereals, where good root growth helps the crop through the season.
Application methods and rates should always depend on soil conditions, crop requirements and local agricultural recommendations.
Agronomy
Why phosphorus is important
Phosphorus is an essential nutrient for plant development. DAP provides a concentrated source of it, together with nitrogen.
Root development
Phosphorus drives strong early roots, which help the crop take up water and nutrients.
Early plant growth
A concentrated phosphorus source at sowing gives seedlings a fast start.
Energy transfer
Phosphorus is part of the compounds plants use to move energy inside their cells.
Flowering and seed
It plays a role in flowering and in seed and grain development.
Application
When and how DAP is applied
DAP is a granular fertilizer that is easy to spread and store. Many programmes use it at or before sowing, for phosphorus and a starter dose of nitrogen, then add urea later in the season for more nitrogen.
Some DAP grades also carry a little sulphur, which helps plants take up nitrogen and phosphorus.
Timing
Autumn for tilling, spring at sowing, and pre-sowing cultivation.
Method
Broadcasting, or placement during planting, for example of tubers.
Soils
Suitable for all soils. On acid soils, the temporary alkaline zone around the granule helps phosphorus uptake.
Compare
DAP compared with other fertilizers
For the trade side of phosphate fertilizers, see the DAP and MAP suppliers database.
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Frequently asked questions
What is diammonium phosphate used for?
DAP is used as a fertilizer to supply phosphorus and nitrogen to crops, especially at sowing and in early growth, to support root development and early plant growth.
Which crops is DAP used on?
DAP is commonly used on wheat, rice, corn and maize, barley, oilseeds, sugarcane, vegetables, legumes and fruit crops.
When should DAP be applied?
DAP can be applied in autumn for tilling and in spring at sowing, as well as before sowing. Rates and timing should follow soil tests and local agronomic advice.
Can DAP and urea be used together?
Yes. Many fertilizer programmes use DAP at or before sowing for phosphorus and a starter dose of nitrogen, and urea later to supply more nitrogen.
Is DAP good for acid soils?
Dissolving DAP temporarily makes the soil solution around the granule more alkaline, which can help phosphorus uptake on acid soils.
Can DAP burn seeds?
Yes, if too much is placed in direct contact with the seed. DAP releases free ammonia as it dissolves, which can damage germinating seeds, especially in dry or alkaline soils. Place it a few centimetres to the side of and below the seed, or keep seed-row rates low. MAP releases less free ammonia and is often preferred close to the seed.
Is DAP used outside farming?
Yes. Diammonium phosphate is also used in some industrial applications, including certain fire-retardant formulations. This page covers its use as a fertilizer.
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