5-1-1 PH issues

spaceman13(6b)July 28, 2013

I cant seem to get my Ph above 4.5 Is there a right/wrong lime to use? I put in twice the reccommended amount and after 3 weeks the Ph is still 4.5.
I'm wondering if maybe my test strips are no good.

This is what I'm using.


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chilliwin(EU DK 7)

I had problem of low pH level, I added more nutrient rich potting soil, it buffers the pH effectively.


    Bookmark   July 29, 2013 at 3:27AM
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Is your pH test potentially inaccurate? Or your lime not mixed well enough?

    Bookmark   July 29, 2013 at 3:38AM
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edweather(Zone 5a/b Central NY)

It takes a while for the lime to alter the pH. The pH will definitely go up over time. Not too much to worry about though because the plants will get their nutrition from your fertigation water which you can make any pH you want. My tap water is 8.0, and I add a teaspoon of vinegar to each 2 gallons and it brings the pH down to about rainwater levels.

Sorry, but I just noticed that you used hydrated lime. Dolomitic/garden lime is suggested, not hydrated lime. Hydrated lime is too fine and powerful and might burn the plants, but if you mixed it in throughly you should be ok. Hydrated lime should work faster too. Just be careful with it.

This post was edited by edweather on Mon, Jul 29, 13 at 9:46

    Bookmark   July 29, 2013 at 9:40AM
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greenman28 NorCal 7b/8a

Twice the recommended amount of hydrated Lime? Yikes, that sounds like disaster...although I don't have personal experience. I'd start over.

Good catch, Ed.


    Bookmark   July 29, 2013 at 12:01PM
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I recently tested the pH of my 5:1:1 using the pour-through method. It was just under 5.0. To counter the high alkalinity of my water, I add acid to it. My trees--pawpaws-- in one gallon containers are thriving in this mix. Like many trees, pawpaws are acid-loving. Are you sure you need to raise the pH to make your plants happy?


    Bookmark   August 4, 2013 at 11:34PM
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