The fact that polyphosphate from Super FK offers added value with respect to the growth and development of a crop, is practically a given. A frequently heard statement on Super FK is that the inherent phosphate is readily available at pH values above 6. A pH above 6 is not required, but is common in practice.
The use of Super FK prevents deposits in the substrate of elements, causing an enhanced uptake of nutrients. The result: more (hairy) roots, a firmer / fuller crop, a greener color and a higher yield. Other positive side effects include reduced sensitivity to various infections.
The agent’s effectiveness below a pH value of 6 is sometimes contested. This scepticism, however, seems unwarranted. A case in point is a recent trial performed at the Research Center in Sint-Kathelijne-Waver, Belgium.
In order to keep the pH in full control, researchers opted for cultivation on water. Each table had its own barrel with the above nutrient solution. This solution was changed every day. The pH of the feed water was 5.5 with an EC of 2.5. The solution was pumped through the gutters. The intervals became shorter as the lettuce matured.
Other trial data
Cultivation: lettuce on NFT (Gardia by Rijkzwaan)
Planting date: 14-02-2013
Interim reviews: 6, 20, 27 March
Harvest and final evaluation: April 3 (48 days after planting)
Evaluation
"Lettuce grown with Super FK had more root mass than the control specimen."
A difference of 14%.
Final conclusion
The assertion that Super FK does little when the pH does not exceed 6, is invalidated in this trial. The test shows that even with an optimum pH of 5.5, Super FK still has a positive effect on the development of a crop.
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mail: wouter.van.santen@yara.com