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InvisibleGod
Yahweh

Registered: 09/26/08
Posts: 434
Intense yellowing after feeding
    #489502 - 10/19/10 06:42 PM (6 years, 1 month ago)

So a couple days ago my plants looked like this:


I fed (7 ml FN Bloom per gal, pH ~5.6-5.8) right after taking that picture, and had flushed heavily instead of feeding last time (4-5 days ago).  When I checked ~10 hours later one of the plants had very yellow fan leaves.  I was a bit worried, but was rushed, and lights were going out soon.  When I came back after another 12 hours, two other plants were yellowing up the same way!  Here's how they look as of about 5 am:





I'm wondering if it's just that they're so excited to get food, they used a bunch to grow and make new bud/leaves, then started taking nutrients from fan leaves to keep up with new growth regimen.  I'm hoping it's that!  What do you think?

Other potentially useful info: 600W HPS, 4 gallon all-perlite Hempy.


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OfflineDieselB
High Watt Closet
Male

Registered: 02/10/10
Posts: 1,156
Last seen: 1 year, 9 months
Re: Intense yellowing after feeding [Re: God]
    #489507 - 10/19/10 07:00 PM (6 years, 1 month ago)

Did you flush with a nutrient solution, or just water? And if it was nutrients how strong were they?


--------------------
If you ain't smokin' dro, you're smokin' reggie. :shrug:


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InvisibleGod
Yahweh

Registered: 09/26/08
Posts: 434
Re: Intense yellowing after feeding [Re: DieselB]
    #489616 - 10/20/10 12:20 AM (6 years, 1 month ago)

Just water, which was probably a mistake.  I flushed one of the three girls with a 1/8 nutrient solution ~12 hours before posting this OP.  Runoff was coming out the same pH as I was putting in, so I just flushed that one and left the others as controls.  I think I pushed the pH too low, 5.5-5.8 or so.  I'll update with more news when the lights come on in a few hours.


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OfflineDieselB
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Re: Intense yellowing after feeding [Re: God]
    #489619 - 10/20/10 12:29 AM (6 years, 1 month ago)

That's what I figured, what I've found growing in straight perlite, you need to feed like right after you flush, otherwise the plants starve really quickly.


--------------------
If you ain't smokin' dro, you're smokin' reggie. :shrug:


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InvisibleGod
Yahweh

Registered: 09/26/08
Posts: 434
Re: Intense yellowing after feeding [Re: DieselB]
    #489624 - 10/20/10 12:42 AM (6 years, 1 month ago)

Hmm, well they were fine for days after the flush.  They only began exhibiting these symptoms after a proper feeding, about 3 days after the flush.  However, I think I've deduced what may have happened:

I flushed them in the first place because they were looking like salts were building up.  Upon starting to flush, I realized runoff was coming out around 7!:eek:  So I flushed with like...5.5-5.7, and runoff finally got down to 6ish.  So pH was probably pretty fine by then, but I was convinced that it was still kinda high in there.  So when I fed, I adjusted to 5.5-5.7 again. 
Symptoms happened within 12 hours, then I flushed that one plant.  Its runoff was coming out about 5.8, but I think it was perhaps a bit lower in the root zone.  So maybe the pH is a tad on the low side, while the plants have been used to it being too high most of the grow?


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OfflineDieselB
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Re: Intense yellowing after feeding [Re: God]
    #489657 - 10/20/10 03:39 AM (6 years, 1 month ago)

Wow, that's really high for the runoff to come out at, I hope you do have it figured out. For that matter I hope I got mine figured out too.


--------------------
If you ain't smokin' dro, you're smokin' reggie. :shrug:


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InvisibleGod
Yahweh

Registered: 09/26/08
Posts: 434
Re: Intense yellowing after feeding [Re: DieselB]
    #489782 - 10/20/10 03:48 PM (6 years, 1 month ago)

So I just checked on them again.  They much different, for better or worse.  The only difference really is that some of the leaves that were yellow before are now wilting and soft, very much like when the plant just retires old fan leaves in flowering.  The difference here is that they're not easily detached at the petiole; the plant doesn't seem to really want to let them go.  Not sure what to make of it.
The one that I flushed might look a little better.  It might just be power of suggestion.  When they've dried out enough, I'm just going to give a thorough feeding at pH 6, and I'll test runoff.

Diesel, how much FN Bloom do you give to your plants this deep into flowering?  I've been doing about 7 mL/gallon, 8 mL seemed to burn them too much.


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