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Old June 7, 2018   #10
zipcode
Tomatovillian™
 
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,582
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Phosphoric acid is risky. I used it and prefer citric (I would use sulfuric but don't have any). The problem is if you have high alkalinity water (tap water usually) and use phosphoric, the amount of phosphorous you add is significant and you get worse nutrient lock than due to the high pH. It has happened to me last year.
Probably the best long term solution would be humic/fulvic, since they are stable in soils, if you find any reasonably priced source (somewhat unlikely, at least currently).

Edit: in case the 'change the fertilizer' was not quite clear, there are fertilizers with overall acidifying effect or the opposite (talking about the chemical ones), you should look at the exact composition. Not sure about the organic fertilizers, there is conflicting information about this out there, but in my experience they're mostly neutral in the long term.

Last edited by zipcode; June 7, 2018 at 07:33 AM.
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