The solution to neutralising ammonium emissions in liquid manure

Liquid manure from dairy or pig farms is aften stored for long periods of time and the applied to fields in spring and summer. The problem is that liquid manure is full of ammonia  and smells pretty strongly. The other problem is that its anaerobe so that there is no composting process of the manure and the ammonium is left to volatilise creating environment problems. Liquid manure is also a very poor soil fertiliser and generally after application, chemical nitrogen is applied to the soil. It also takes weeks before the liquid manure is absorbed by the soil due to oxygen depletion.



GierO2 is a highly stabilised source of oxygen that is added and mixed into the liquid manure. It then slowly decomposes inside the liquid manure providing a source of oxygen to the aerobe micro-organisms and allows for a composting process. It converts ammonia to nitrite and nitrate, converts organic phosphate to inorganic phosphate and liquidises the manure making it very easy to handle and spread out over fields. 


GierO2 significantly improves the fertilising capacity and quality of the liquid manure.


Trials were carried out using GierO2 added to liquid cow manure. Giero2 was added twice. The first time 6 days prior to field application and the second time 6 hours before field application.   

Using an ammonia detector, it was determined that no ammonia emission was present in the liquid manure spread out over the field. 

No smell was detected by the operator, he also noticed that no birds were present whereas normally with untreated liquid manure many birds follow the spreader. He also noticed that no worms were coming to the surface, which surprised him.


Soon after we started using GierO2 we started noticing other benefits:

  • Increases the microbial protein % in grass by 70%. Grass treated with GierO2 liquid manure has a Microbial protein content of 85% on average. In untreated manure the ratio between microbial and none-microbial protein is 50:50. Due to higher microbial protein in grass, we have measured higher protein % in milk ranging between 0.5 to 1%.

  • Increases inorganic phosphate from ± 55% to ± 78%. Inorganic phosphate is directly absorbed by plants, which means that it is very likely that less phosphate leaches out.

  • Manure treated with Gie02 versus untreated manure + 80 kg pure Nitrogen fertilizer (NF):

    • Result: Untreated manure + NF grew better initially, but was rapidly surpassed by manure treated with GierO2.

  • Higher fertilizing value of liquid manure when applied to field. No nitrogen fertilizer is required.

  • Nutritional value and volume of grass treated with manure + Gier02 was much better.

  • Manure absorption by the soil on average 5 times faster than untreated manure.

  • Because GierO2 makes liquid manure aerobic it is much friendlier to the soil micro-flora.

  • Treated manure becomes more fluid and much easier to pump from manure pit. Hard pieces of manure are eliminated.

  • Encourages faster grass and root development.

  • Color of treated manure from dark green / brown to a lighter color.

  • No investment cost, low tech, low cost

  • Significantly higher yields obtained with maize and potatoes when grown in soils fertilized with manure treated with GierO2.

  • Farmer can save money on fertilizer and on supplementary cow nutrition. This easily covers the cost of using GierO2.

    • It was estimated that for each ± $1.00 spent on GierO2 a farmer would get a direct & indirect return of ± $3.50 making a profit of ± $ 2.50 per each $1.00 invested.