The phosphate in traditional fertilizers (such as MKP, MAP and water soluble NPK) is in the form of orthophosphate. This type of phosphate has the characteristic that it easily form a compound with calcium, magnesium and iron. As soon as this compound is formed it will precipitate out of solution. It is then no longer available for the plant and can even cause blockages of the dripping system.
At a higher pH and/or a large volume of phosphate the amount of participation will increase. The result of this; less phosphate is available for the plant. An increase of phosphate does not result in improved availability for the plant because this precipitation reaction increases unproportionally.
After the introduction of polyphosphate many growers saw that polyphosphate in a low dosage, keeps the system clean form participation and in a higher dosage it gives extra vegetative growth to the plants. Disadvantage of the use of polyphosphates is the high pH of the product which makes it necessary to add acid in the fertilizer tank and sometimes it contains a high level of sodium.
With the introduction of Haifa GrowClean™ this disadvantage is a thing of the past.
How does it work The unique polyphosphate used in GrowClean remains stable in the solution even at a high pH and a high dosage rate (above 62 mg/ltr P). It does not give any precipitation with other elements. The polyphosphate even ensures that elements - which have precipitated - are re-dissolved. So growers are achieving an improved efficiency of the elements that are provided.
Dose for a clean systemThe standard recommendation is a dose rate of 30.9 mg/ltr P from GrowClean. [0.865 gram per gallon yields 30.9 mg/L(ppm)]Note: if used from the start of the season – and the system is clean - a dose rate of 15.5 mg/lt P from GrowClean is enough.
Assuming a 1000 liter tank 100 times concentrated the following amount is needed:
15.5 mg/ltr P
30.9 mg/ltr P
46.4 mg/ltr P
61.8 mg/ltr P
* The recommended doses are averages for all crops. Not all crops react in the same way to GrowClean.
Therefore it’s advisable to discuss the exact dose with your adviser or supplier
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