Ongoing issues

ReggieDobson

Active Member
Hi everyone!

Right so recently I have posted a thread cus I couldn’t recon what issue I had, I was suspecting either light issues or something with the nutrients. I dimmed the light on 75% and I checked ph of runoff which was around 7.8-7.4 so done a bit of flush nothing heavy tho and they looked better two days afterwards so yesterday I gave them only water again to fully clean them out and today I have noticed that the issue I had actually got worst so I know I had lockout and I am almost sure that it is progressing potassium deficiency. I got a lux meter today and I measured the light and at 75% it’s too weak (which rules out light issues) and actually I dimmed it back to 100% and now the reading on the highest point of canopy is (see the photo). So my questions are:

1. I have been running my lights until today on 75%, I had only dimmed the light on 100% for a day last week but after spotting those leaves being burnt I assumed light issue so I have put it back on 100% today. It nearly end of 6th week of flowering so do you think changing the light at this point will contribute to better yield?

2. Am I right that this is potassium deficiency and maybe I shouldn’t be flushing them yesterday as maybe I washed everything out and remember I lightly flushed them when the issues had begun 4 days ago as well. I’ve got some PK agent so now how to sort this issue out? Obviously I can’t feed them until Friday I suppose because the soil is still wet so need to wait for it to dry out and therefore I am worried that they will get worst until Friday, what’s your thoughts about it?

3. If I’m gonna feed them next time should I give them only water with PK agent or should I give the PK agent, bit of cal mag, rhizotonic, booster and half of the dosage of Flo fertiliser? I know that one thing might be locking the other so I’m not sure if I should use but if everything in the solution at once or should I do it any different way?

As for the photos that’s three shots of my girls, so first photo be of first plant (there is couple of big fan leaves like the one on the photo, around 5-6 leaves), then second one and the third one isn’t that bad yet.
 

ReggieDobson

Active Member
What light are you using, and how high is it from the canopy?
Lumatek pro ats 300w, it’s about 14inches from the tallest canopy and about 16inch from the the rest. I know it’s not the light because I had been running the light at 75% and they were fine I’ve just dimmed the light to 100% just an hour ago because I used that lux meter and it was a bit low on 75% so I think I can go with 100% easily. Anyways if the light issue is out of the table then it must be deficiency
 

harris hawk

Well-Known Member
many companies say this - veg at 60% and increase it to 100% before flower - flower at 100% and then the last 2 weeks lower to 60% -before harvest
 

Modern Selections

Well-Known Member
What is your pH input? Looks to me like the plants have suffered high pH and are in need of a feeding at the correct pH. Soil 6.3-6.5, coco 6.1, hydroponics 5.8.
 

ReggieDobson

Active Member
What is your pH input? Looks to me like the plants have suffered high pH and are in need of a feeding at the correct pH. Soil 6.3-6.5, coco 6.1, hydroponics 5.8.
I use tap water and I always let it stand for 24hrs for chlorine to evaporate. Then the ph is above 8 but after adding nutrients the ph of the solution is 5.4-5.8 so I add a bit of ph up to bring it back to 6.2-6.5. I had fed them too often I guess cus when the issues started I tested the run off which was way too high (7.5-7.8) so yesterday and three days before that I fed them only with bottled water from Tescos (6.2 ph)
 

StickyBudHound

Well-Known Member
I use tap water and I always let it stand for 24hrs for chlorine to evaporate. Then the ph is above 8 but after adding nutrients the ph of the solution is 5.4-5.8 so I add a bit of ph up to bring it back to 6.2-6.5. I had fed them too often I guess cus when the issues started I tested the run off which was way too high (7.5-7.8) so yesterday and three days before that I fed them only with bottled water from Tescos (6.2 ph)
My tap water will drift back up to higher pH after nutes get added. The addition of nutes dropping it was temporary. It was causing all kinds of problems and the only way I was able to get a handle on it was to install an RO filter system. The pH stabilized and the weird variations of problems on the plants stopped after that.
 

ReggieDobson

Active Member
My tap water will drift back up to higher pH after nutes get added. The addition of nutes dropping it was temporary. It was causing all kinds of problems and the only way I was able to get a handle on it was to install an RO filter system. The pH stabilized and the weird variations of problems on the plants stopped after that.
Hmm interesting, I will check the solutions ph next time couple hours after it’s been made to see what’s ph like, cheers pal
 
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