Organophosphate passes Potash & Phosphate Institute’s Standards (Quality & Standards)
A large number of Phosphate Fertilizer is available on the market. However, while in the selection of agronomist, asuitable source is vital.There are some facts that need to be considered while selecting ‘P’ Fertilizers involving:
Citric Solubility of Phosphate
While we all use P2O5 content as an index of quality it doesn’t mean much in terms of the potential effect of the Phosphate Fertilizer on crops. For example, consider a Phosphate Fertilizer with quite low total P2O5 of 25% and citric acid soluble ‘P’ of 15%. The 1,000kg Phosphate Fertilizer yields 16kg plant available P. By contrast 1,000kg of a material with 30% total P2O5 but citric acid soluble P of 10% yields only 13kg P.
2% CA Soluble P (%)
Amount available P (kg)
Amount available P2O5 (kg)
Rock / Natural Phosphate P2O5
Particle Size and Fineness Assessment
The finer the material the greater the surface area of the Phosphate Fertilizer exposed to the soil solution for dissolution. Most experts consider grinding so that 80% of the material passes through an 80 mesh (0.18 mm) sieve to be sufficient”. With Minjingu Organic Phosphate,over 90% of the material will pass 0.15 mm sieve and not more than 10% will pass through 0.25 mm sieve.
Moisture Content Assessment
Check moisture content of the Phosphate fertilizer. You get less ‘active’ ingredient (P/TShs.) if the material is damp/ wet and damp as it is much more difficult to spread in the field. Minjingu Organic phosphate is dry; moisture content of only around 5%
What does this mean to you?
In most cases to get the effectiveness of applying 100kg of Minjingu Organophosphate you will need at least 2 times the amount of other P fertilizers. The recent trials in Southern Tanzania comparing the use of 200kg Triple Superphosphate (TSP) against about 80kg of Minjingu Organophosphate+ revealed that after 6 months of application, Minjingu Organophosphate yielded 20% more harvest.