Aqua Man
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High P can kinda present as high nitrogen at first and can affect calcium and magnesium uptake. I'm kinda thinking it's plausible this could could be what you are seeing. Especially if added cal mag haven't helped.I was using about 2/3 the recommended dosage of Remo's Bloom, Micro, and Astroflower until a week ago when I made this post. Since then, 100% recommended.
I was using 1/20th recommend Magnifical until a week ago when I made this post. Since then, 100% recommended.
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High P can kinda present as high nitrogen at first and can affect calcium and magnesium uptake. I'm kinda thinking it's plausible this could be what you are seeing. Especially if added cal mag haven't helped.
If you added cal mag and it's still progressing 4-5 days later then I may look to another reason calcium may not be being taken up. That's could be a few reasons. High P could be one reason.Too much P you are saying? So maybe go easy on the Astroflower for a bit you think?
I was considering upping the mag/cal a bit.
Or reducing the light intensity.
Thoughts?
FYI Reservoir temp is 17.8 C (64f)
Dude ime never go over 6.1 I generally like 5.6-5.8 and let it drift up to 6.0 never above.I am thinking perhaps my attempts to keep ph in 6.0 to 6.5 (sometimes goes to 6.8 before I can check it) in order to aid calcium absorption has contributed to P lockout?
Maybe I should give it some 5.5PH water for a bit?
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I would change nothing with the nutrients for right now after hearing that info... Adjust your ph and see how she responds.
Curious to see the ph after 24 hrs. If it's rock stable try cutting back to 1/2 tsp.I took a few steps today. Thanks, @Aqua Man for taking extra time and to share some very helpful knowledge.
I changed out my reservoir today with fresh nutrient solution. I used close to the directed amounts (~7ml/gal instead of 8) of Bloom, Micro, MagnifiCal each. I ditched the Astroflower (aka bloom booster) under the hypothesis that it was contributing to the problem with too much pk for late flower.
I also learned that with my super low ppm water, it is okay to use some PH UP (about 1 tsp/5gal) prior to adding nutrients and then finally adding PH down. I was struggling with 0.5 to 0.8 PPM swings over several hours. So I will be using my Potassium Hydroxide 34% for now, and shop for some potassium silicate to use instead.
With this mix, my 6.8 ph 30 ppm tap water went to 12.00, and ppm went to 150 after adding 1tsp/5gal.
After adding my nutrients to the water the ph went to 8.0 and ppm went to 850.
After adding about 3 tsp of phosphoric acid 34% the ph came down to 5.5 and stayed there with a PPM of 880.
I also changed the lighting, taking out the 650 actual watts of "full-spectrum" blurples, and replacing it with a single 240w V4 hl lm301b quantum led. Once I see no more signs of burning I intend to up the DLI incrementally by adding more lights.
This light has 512 pcs Samsung lm301B leds (even mix of 3000k and 4000k)+32pcs Epistar 660nm.
I have also changed from flooding every 3 hours 24/7 to only flooding during lights on. I used to just be too lazy to set the actual time on it. And am flooding at 50% greater frequency during that 12-hour lights-on period than I was before. (every 2 hours instead of 3)
Fingers crossed that the girls respond well and finish their last half of flowering on their best foot.
I will be cleaning up the dead leaves on the bottom and in the branches.
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Curious to see the ph after 24 hrs. If it's rock stable try cutting back to 1/2 tsp.
Yup that the point it should take longer. Try going to 10ml per 5gal next water change18 hours since my last post.
PH is at 6.39
I would say that shows I failed to buffer the reservoir by much. It is still swinging in the same range, just perhaps taking more hours to do it.
Make sure water is aerated before using if it's tap.
Did you check for spider mites? Yeah the ph should be more stable now then. It's a good sign they are drinking well
Ok just wanted to make sure. Should see it stop progressing in a day or 2. If it's still spreading then it will need some more looking into but I'm fairly confident it won't.I've been looking affected leaves with a 60 x microscope and I have not seen any sign of pests.
I only grow Hydro and keep outside clothes away. Not even house plants or carpet so hopefully I don't encounter that issue
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