Ammo-Phos® / Hycrop 9-19-7

Important Information

• BENEFITS

  For drilling or banding close to seed, where a high phosphate supply is required

  Less risk of seed burning compared to DAP due to virtually no free ammonia being released

  MAP based products are superior on alkaline soils compared to DAP

   

  Ammo-Phos / Hycrop 9-19-7 is safer to use than DAP-based fertilisers, due to less risk of seed burn.  This is because of the MAP releasing virtually no free ammonia, which is toxic to seedlings.  Used in place of Hycrop 8-15-15 where soil potassium levels are good.

   

  It is suitable for drilling or banding close to seed, where an equal amount of phosphate and potassium is required, as there is less risk of seed burning compared to DAP due to virtually no free ammonia being released, which is toxic to seedlings.

   

• USES

  Ammo-Phos / Hycrop 9-19-7 is used for pea and potato crops, as well as other vegetable crops.  It is suitable where there is a greater proportion requirement for phosphate over potassium.

• APPLICATION

  Application rates will vary according to base soil fertility. For pea crops, about 150kg may be used. As a pea fertiliser it should also contain 400 grams of sodium molybdate per tonne of fertiliser, to aid nitrogen fixation by the rhizobia bacteria within the pea nodules. For potato crops, rates may range from 250 to 500 kg/ha, depending on base soil fertility, and yield potential.

   

  Application rates are typically 400kg/ha in Mid October.  Actual spreading rates will vary according to farm type, climate, productivity, soil type and crop type.  Soil testing and fertiliser plans are available to ensure you use the right product at the correct rate.  Call our Customer Centre for information.

   

  As with most solid fertilisers, Ammo-Phos / Hycrop 9-19-7 can be stored over a season as long as it is kept in a cool, dry, well ventilated area. 

   

  Ammo-Phos fertilisers contain monoammonium phosphate (MAP), which is manufactured by chemically reacting one molecule of ammonia with one molecule of phosphoric acid.  Diammonium phosphate (DAP) is made the same way, except that two molecules of ammonia are reacted with each molecule of phosphoric acid. As MAP has only half as much ammonia in proportion to the phosphate, there is virtually no release of free ammonia, and therefore can be sown closer to seed compared to DAP.

   

  MAP has been found to be superior on alkaline soils, due to (i) its acid nature (compared to DAP, which has a slight alkaline effect) and (ii) the greater volume of soil enriched with phosphorus.