I came across an article that stated ( A 2-6-0 solution is equivalent to 1 part of 10-34-0 liquid fertilizer diluted with 4 parts of...
liquid fertilizers #385901
Asked February 20, 2017, 9:07 PM EST
I came across an article that stated ( A 2-6-0 solution is equivalent to 1 part of 10-34-0 liquid fertilizer diluted with 4 parts of water ) can you please advise how this is calculated ?
My reason for asking is I have some 10-8-8 liquid fertilizer that says to add 30 ml per liter of water in doing so does this mean the solution will not be a 10-8-8 and if not what would it be ( how to calculate this )?
I appreciate any info you could offer.
Kind Regards: John Powell
CountyOutside United States
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.
Good morning Mr. Glen N. and thanks for the quick reply to my message, I fully understand your reply,
Sorry but one more quick question, I spoke with Hafia fertilizer company regarding some 21-21-21, first person stated use one kilo per one hundred liter of water ( I did test and this killed the test plants, called them back and they stated try one kilo per 200 liters or 300 and even 400 liters of water.
I understand if example if do 300 liter the ration between the chemicals would stay the same as you advised but how to know the strength of the solution ? just divide by 3 and the 21-21-21 now becomes a 7-7-7 ?? Is my thinking correct or way off ??
This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.