DAP

DAP

DAP – Di-Ammonium Phosphate

 

N% P% K% S% Zn%
Typical Analysis 18 20.2 0 1.5 0

 

Chemical Name Diammonium phosphate
Crop Segments All
Features High analysis nitrogen and phosphorus contained in every granule.
Quality & Handling Nominal 2-4mm size granule, free flowing product.
Bulk density 0.9 tonnes per cubic metre.
Blending Can be blended with most products and trace elements except for Single and Triple Superphosphate.

FEATURES AND BENEFITS

  • High analysis source of phosphorus.
  • N:P ratio of 1:1 makes it an effective source of nitrogen.
  • DAP releases free ammonium. Nitrogen in the ammonium form resists leaching and is a slower release form of nitrogen.
  • The free ammonium gives a higher pH reaction immediately around the granule.
  • The low cost of nitrogen in DAP makes it a cost effective source of nitrogen if Phosphorus is also required.

MANUFACTURE

Ammonia gas is combined with phosphoric acid in a ratio of 1:1, granulated, dried and screened.

USES

One of the major cropping fertilisers used in Australia as a source of both phosphorus and nitrogen. The high phosphorus content makes it a true high analysis fertiliser. DAP and DAP blends are used on a range of crops in broad-acre farming, cereals, sugar cane, sowing pastures, dairy pastures, fodder crops and also in horticultural crops; for example, vegetables and tree crops.

STORAGE AND HANDLING

  • Does tend to take up moisture, both in storage and in the field.
  • Storage in a bulk shed is the preferred storage method. Covering with a tarp may reduce any moist air uptake.
  • The use of augers may damage the fertiliser and increase any handling problems.
  • Do not leave exposed to moist air.
  • Either fill or empty (completely), the drill or air-seeder fertiliser box overnight.
  • Cover seeding equipment with a tarp.
  • Raise the equipment tynes from the soil to stop moisture moving up the tubes.

RESTRICTIONS

  • For sowing there is little risk of affecting germination, even at high rates. The general rule of a maximum of 20kg/ha of nitrogen at seeding of cereals should be used.
  • When applying DAP, the fertiliser 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.
  • Do not store in silos.

 

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