Pale Leaves/Yellowing Tips - Week 7

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Hi all - hoping some of the more experienced growers could give me a little guidance here. THANKS SO MUCH!!

Problem: Leaf tips have been yellowing for a couple weeks now, but never moving too far up the leaf -- literally just the tips. The last week or so, all of the leaf mass seems to be getting a bit pale -- more light green than yellow.

Medium/grow method: Soil (Ocean Forest/Perlite); 3 gallon fabric pots.

Feed: I've been Fox Farm Grow Big every other watering since about week 4 (about 2 feeds a week). Usually about 1/2 the dose recommended by manufacturer -- but I skipped the last feeding in light of what I thought was nute burn evidenced by the discolored tips, and the feed before that I only used a 1/4 dose for the same reason. I'm also supplemented with 1/2 dose of CalMag and Silica every other week; and used GH Rapid Start for the first few weeks after sprout. I haven't started Bloom nutes yet, but the plan was to do a 1/4 dose of Grow Big and 1/4 dose of Tiger Bloom beginning tomorrow; and then 1/2 dose of Tiger Bloom the next feeding with no Grow Big. I was watering every 3 or 4 days for first 30-35 days; now I'm having to water every 2 days.

water source: city water; runs a little acidic, so usually have to PH down to about 6.5.

Strain/age: Northern Lights - Middle of Week 7. Still not entirely sure what the difference is between "pre-flowering" and "flowering", but she started throwing off pistils around Week 5. I didn't get much of a stretch at all -- she's only about 24 inches tall from the floor (about 12 inches from the soil). I was holding off on starting the bloom ferts in the hope that I get a little vertical push, but it didn't really materialize. But overall the plant has a nice little canopy. About 12 or so decent colas all with equal access to the light.

Light: HLG 260xl - about 18 inches at 250 Watts; 20/4 light schedule

Climate: Indoor Tent; running a Cloudline T6 inline exhaust fan with Carbon Filter; passive intake; couple desk fans pushing air around; Temps: 78-79 during the day; 69-70 at night; RH: 45-55.

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Hey @Proph - do you have any thoughts? Sorry to beckon you over here, but saw some of your posts in another thread and figured you'd have some ideas. Any help would be much appreciated!
 
Hey @Proph - do you have any thoughts? Sorry to beckon you over here, but saw some of your posts in another thread and figured you'd have some ideas. Any help would be much appreciated!
Het bro! Looks like a potassium issue.. But what is causing it is hard to say right now.. It could be an actual potassium issue due to lack of potassium (flowering plants require less N and more k)... Or it could be due to an excess of something that is locking out the potassium (excess of magnesium and/or nitrogen will lock out potassium)... I would lay off the cal mag and switch to bloom nutes (should be lower in N and higher in P) and watch the leaves closely for spreading.. The leaves won't get any better, so your goal is to stop or slow the spread. It would also benefit you to know the ppms of your feeds and your plain water..
 
Het bro! Looks like a potassium issue.. But what is causing it is hard to say right now.. It could be an actual potassium issue due to lack of potassium (flowering plants require less N and more k)... Or it could be due to an excess of something that is locking out the potassium (excess of magnesium and/or nitrogen will lock out potassium)... I would lay off the cal mag and switch to bloom nutes (should be lower in N and higher in P) and watch the leaves closely for spreading.. The leaves won't get any better, so your goal is to stop or slow the spread. It would also benefit you to know the ppms of your feeds and your plain water..

Hey man - thanks so much!! I'll hold back on the calmag for sure. I just hit them with 1/2 dose of tiger bloom today (also top dressed with a couple cups of ocean forest soil -- just to cover up some roots that were starting to surface a bit). Maybe 1/2 dose of bloom was a little light if you think I might have K deficiency? Do you think should I feed them again with my next watering or stick with every other?

My water runs at about 200-220 ppms. Last couple feeds I've fed about 650 ppms, including this afternoon -- today's runoff was around 1050 ppms. I think my runoff has for the last couple weeks generally been about 400-500 ppms higher than what I'm putting in (it took until about week 3-4 before the runoff was under 1500 ppms, I'm assuming because the soil is fairly hot). Does that delta seem problematic?

I'm also finding that I need to water like every 36-48 hours now it seems -- these 3 gallon air pots are drying out very quickly. Any chance I'm burning them a bit with the quantum board turned up to 250?

Thanks again for taking a look - very much appreciated!
 
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