[Support request] pH issues between res and both trays

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  • May 28, 2024 at 8:19 am #1337
    Kray8
    Participant

    I have been battling a pH issue since setup.

    I am finding that my res is climbing from 5.6, on average, by .15pH/24hrs
    I have two pots set up and each have very varying pH levels- L/H is 6.3 and R/H is 5.75.

    Both plants have previously been locked out due to pH, and while it has got better, both are still showing signs of ill health/deficiency/lockout. Environment Details below –

    Using 2no AutoPot one systems on the same loop with both AirDomes and AirBases, AirDomes set to low during lights on only.

    Caramello and Blueberry OG 30 days old from seedling, both photos and grown from seed. 70/30 coco/perlite with clay balls surrounding AirDomes.

    Feeding The Source range to 1.1EC and 5.6pH. Mixing as per instructions – RO/Tap 95/5, A+B, Delta, Origin and Elements, in order. Adding Cyco Dr Repair N-P-K-Fe 3-0-0-.6. Adjusting pH with phosphoric acid and potassium hydroxide. Average water temp is 20.5c. I am not using a pump in my res as this makes the pH climb worse.

    AC Infinity Evo3 full spectrum LED. PPFD of 550 for 18 hours with a 2 hour ramp up and down. 700mm from canopy.

    Day/Night temps 25c/22c – Day/Night VPD 1.1/.9

    Please let me know if I have missed any information.

    May 28, 2024 at 8:24 am #1340
    Josh
    Keymaster

    Hi There…..the source range should NOT be used with any other products …… this could be issue 1…. The second issue could be that you have used clay pebbles around the AirDomes, did you pre-treat these before use … ideally they should be soaked in pH 5.5 with 1/4 strength feed for 48 hours and then the solution poured off and NOT rinsed….. However they are not necessary if the media is open… please look at the catalogue on the website as there is lots of information here….. if using AirDome I would also suggest that you up the perlite content to maximise the effect of the AirDome

    May 30, 2024 at 1:49 pm #1341
    Kray8
    Participant

    Thank you, I will change my approach with the pots next grow.

    I am using the source fertilisers for the first time. I have tried to follow the directions on the website and some information isnt clear and I cannot find any documentation on the composition of each product.

    The instructions say to use Gro and Flo A+B first, does this include Elements? As I have always been of the impression that CalMag needs to be added first?

    My RO EC is less than 0.1 ec, therefore has minimal to no iron content. My plants seem to be showing sighs of Fe deficiencies. Is there any Fe in these products? Where can I find composition documentation?

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