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API Leaf Zone and K levels

1539 Views 3 Replies 2 Participants Last post by  jerryuk
Would there be someone out there that would agree with me that the K levels in API Leaf Zone are quite high?
My assumption for this came about when I was dosing daily doses without water changing for more than 3 weeks...
I have read on some forums that high K levels will reduce the uptake of Ca..... I have noticed a Ca deficiency - but the Ca test shows sufficient Ca, and I add extra Ca without any noticeable change. After a water change, without adding any extra ferts, all goes well again. This problem was worse when I was adding KNO3 on top of that... I have since started using NH4NO3 with better results, but I still have to water change the tank every 2 weeks to prevent the K levels from going up....

Any comment on this??
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AFAIK API only provide a weekly dose amount which is 5ml per 40L, which adds 3.75ppm of K per litre. This is quite a lot higher than many other ferts but isn't particularly high given the Fertilator's recommended level of 10-20ppm.
but if the plants are not utilizing it all, it will accumulate, and without water changes, the K will increase... what would be your opinion as to how much is too much??

I have started using another brand of liquid fert for my Fe and Trace... I will post up my findings in a few weeks....
Well you don't say how much Leaf Zone you're dosing but I'd hazard a guess that K isn't the problem - I'd say it's more likely that you're depleting another element and the water changes are adding it back in. If you look at PMDD recipes the amounts of K are quite high. If you're plants aren't using much then they won't be using much of anything else either.

Look forward to seeing the results of your new trace.

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