Hello
The 3-digit formulation stated, by law, on prepared fertilizers expresses the relative percentages, by weight of the active chemicals Nitrogen, Phosphorus and Potassium. So yes, 2-6-0 is approximately the same formulation as 10-34-0 (there is approximately 3 times as much Phosphorus, by weight, as there is Nitrogen. The difference between the 2 formulations is approximate 5 times (10% N is 5 times more Nitrogen than 2%). So in theory diluting the stronger formulation would result in a formulation closer to the weaker one; however, the ratio between the chemicals remains the same.

Most liquid fertilizers like this (or called water soluble if in a powder form) are concentrates, so require dilution by water to be safe to use on plants. The dilution rate according to the package instructions should produce a fertilizer close to that listed on the container. A greater or lesser dilution will adjust the formulation totals, but not the ratio between the chemicals (so diluting your example at 15 ml/l water will produce something like 20-16-16. The ratio is the same, only the relative strength differs.

These fertilizers in too-high concentrations can be harmful, so it is recommended to use the dilutions stated on the packages. It is also possible to use a weaker solution (higher dilution) but use more frequently. These chemicals leach quickly, so a weaker but more frequent use can supply a more regular dose for the plant.

Hi John
That would be what I would say, yes; however, it is odd the company seemed uncertain what dilution to be using. It would perhaps be a good idea to confirm the analysis with the company