Run-Off Ph Is Much Higher Than Feed Ph When It Went In????

Discussion in 'Sick Plants and Problems' started by adamsgoneawol, Aug 30, 2014.

  1. photo 5.JPG photo 5.JPG Hey Guys! 
     
    2nd grow, got 4 Blue Cheese clones in coco in 15L pots.  I'm using House and Garden Nutrients, and I'm in 3rd week of Flowering.
    I'm a bit concerned cos I'm feeding my plants at 5.7 ph, 4 litres each every 2/3 days.  However when I test the run-off, it's coming out at 6.5.  Is this going to become a problem? Do I need to flush the coco?  Why is it coming out so much higher?  I know coco is supposed to be neutral so is it down the nutrients I'm using?  I'm not exceeding the recommended doses.
     
    Any help would be much appreciated :)
     
    Adam
     
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  2. #2 mantriur, Aug 31, 2014
    Last edited by a moderator: Aug 31, 2014
    How much runoff are you getting from 4 liters in 15L pots? It might just be old fertilizer solution changing chemically over time. But you're going to have old ferts in the runoff either way. For the sake of measurement, you could try to flush out leftover nutes first with soft pure water. Measure that runoff to see what's really in the substrate. Then water with your nutrient solution and check that runoff again. It should be closer to what you're putting in.
     
    Also before watering, let the nutrient solution sit for 10-15 minutes for the PH to stabilize. What you measure right after mixing it, might not be what it turns out ...
     
    There's also the possibility of bad coco. I don't have much experience there, but I know that there are differences in quality due to the harvest and cleaning process. But I don't know what that would do to the PH. Have you rinsed the coco thorougly before using it? If so, with what? If you used very hard tap water, it might be residue from that, but that shouldn't last long ...
     
    tl;dr: Try more runoff. :)
     
    Edit: Your plants look very good. You might want to cut back on the nutes slightly. They all have tiny yellow tips, which points to fertilization at the maximum. With nutes, more isn't necessarily better, if you fertilize at the upper limit, you're really just wasting money.
     

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