You wouldn’t cook a whole year’s meals in a day, so why would you provide your pastures with a whole year’s phosphate in one day?

Unlike traditional water soluble phosphate fertilisers which are prone to losses from runoff after application and immobilisation by soil biological and chemical processes, dicalcic phosphate (HDP) provides a non-water soluble product which provides plant available phosphate at a rate which can be utilised efficiently by pastures. These two aspects of phosphate delivery mean that less phosphate needs to be applied and the longer release properties mean pastures get a continuous supply of phosphate for better sustained production through the season.

During HDP manufacture, a process that we have refined over the last decade at Avoca, superphosphate is fully reverted with lime producing the dicalcic phosphate and neutralising any free acid. The product then has to be broken up and crushed to produce an easy to handle, stable fertiliser product. This means lime and phosphate can be spread in one easy application with no risks of the product going off and setting in fertiliser bins and clogging spreading equipment. Weather events after application are also far less influential making timing of application more flexible.

Another big advantage when using HDP is its near neutral pH from 6.5-7. This pH means that soil biology isn’t affected like it is with acidic products with pH less than 2, and can continue their natural processes which are extremely important to nutrient use efficiency and healthy soil function.

For the past three years Avoca has been manufacturing under the Hatuma Dicalcic Phosphate brand which provides great support in the way of up to date research, product manufacturing regulations and quality control. This agreement also allows Avoca to manufacture HDP for other fertiliser distributors.

All in all, HDP provides a cost effective option to reduce phosphate application rates by increasing nutrient use efficiency at the same time reducing environmental impacts.

For pricing information, or to find out more about how your farm could benefit from dicalcic phosphate, talk to one of our soil consultants today.