I have had this problem of bottom leaves turning black around the edges then it eventually consumes the whole leaf and it drops off, I’m getting around 3-5 leaves per plant daily. From the deficiency diagnose pictures, phosphorus is the one that matches my plants. I seen on the nutrient availability chart that phosphorus is barely available at ph going in at 5.8. Which is what i was keeping it at. But last 2 waterings i raised it to 6.0 thinking it would take in more phosphorus. But if I’m diagnosing this wrong I’m just causing more problems. So I’m asking for help from weed scholars of ILGM. I have 4 plants under scrog net , 2 Gold Leaf and 2 Super Skunk photos same feeding schedule.
-Hlg 600 light
-2 Gold Leaf and 2 Super Skunk Photos
-Coco and 30%perlite
-Jacks 321
-Temps 73-75
-RH 58-62
-using Apera GS1 ph pen
-tap water from well ph=7.2 ppm=288
PH in= 5.9 ppm in= 907 #1 SS out ph= 6.2 ppm= 948 #2 SS-2 out ph=6.2 ppm= 1086 #3 GL-2 out ph=6.0 ppm= 1375 #4 GL out ph=6.1 ppm=1212 @OGIncognito@Graysin@Hellraiser@PurpNGold74@beardless@Nicky
I been reading this forum for 4 years now this is my 2nd grow, first in coco. I’m tagging those that have similarities to my grow or who have impressed me with something knowledgeable in the past.,THANKS
Run off numbers look great, a little high on the last 2 PPMs but not bad. I’m not seeing a deficiency at all, very healthy looking. In my experience with PK deficiencies most have surfaced around the mid height around weeks 4 or more in flower. I would clean everything up under the SCROG frame, those bud sites will never see the light. You are discarding the run off in the drip pans and not letting the plants set in this correct?? Make sure there’s plenty of air flow under and blowing through the canopy
This is low for flowering, perhaps. The numbers do look good, but I’m more inclined to feed at 6.0-6.2 for flower, largely because what you identified already - important flowering nutrients aren’t as available at the 5.8-6.0 range.
PS - lower your Epsom from 1.4 to 1.0, that’s a lot of Magnesium going in alongside the 4.0 part A. You can also scoot your Part B up a little (2.2) to add more calcium to the mix.
I’d thin her out at the bottom as suggested and bring rh down to 40-50%-ish if you can. With some lush, healthy, green vegetation such as yours, rh over 55% can start leading to such issues. Being at the very bottom, I’m inclined to think those leaves got splashed and stayed damp from the humidity on the higher side. Doesn’t really look like a particular deficiency/toxicity. Just my take, hope this helps!
I don’t know but i thought when low on phosphorus your plant’s would be light on color and if to much would be dark like some of the leaves in pictures.
We all agree that the plants are due for a lollipop and defoilation, anything bloee the net should be gone.
Then remove any sicker branches that are thin, if it ain’t the thickness of a lollipop stick or thicker dispose of it. Followed by thinning out 50% of the fan leafs at least.
Now let’s look at your environment, ideal plant temp & humidity.
Ideal temp is 27-28C or 81-82F, meaning your humidity should be around 70%. Alot of people don’t like running their humidity this high but with constant quality airflow it’s ideal. As long as you also have a good solid russle on all the plants via in tent fans the humidity will aid your growth with no mildue issues as your still early in flower.
5.9 PH in and 6.2 PH out… That means there is a 0.3 PH build up of salts in the root zone, that’s what my mind is telling me.
When I run into issues I don’t like the simple thing to do, because coco is so easy to manipulate, is I flush the heck out of it and then re run a full feed through it with a fresh batch of mixed and PH’d feed.
This is insurance, as I know there is no salt build up causing lockout issues within the root zone, as well I know the mix I just fed was patiently mixed and fresh.
You can mess around with Jack’s in a bunch of different ways, it’s a complex thing that really requires a calculator so I leave that up to other people for the most part like Green genie.
Adding more calcium won’t help because it’s not about the calcium in the mix as much as it is being absorbed due to other factors of nutrients.
Your to early in flower I would Geuss (could be wrong) in all my experiences of reviewing grows I very very very rarely see a P or a K deficiencie.
Moreover if these are lower leafs, the plant might just be sacrificing them because they arnt getting light anymore and thus its no longer completing its full photosynthesis cycle and instead dieing. All the more reason to run a clean up.
Looking back up at the leafs… They just look old and dieing to me, so ya I think nothing major here. Do a clean up
the reason i was thinking phosphorus is because of what the trouble shooting illustration of all the deficiencies and excesses show. It’s the closes match to what i have.
As far as the drip pans go I pump out as much as i can, there’s always a little on bottom but it dries up in a couple hours. Is this ok or do i need to dry it up better ?
I’m just starting week 3 in flower. I did a defoliation a week ago but i’m ready to do another. I’ve done a flush couple weeks ago. When i do a flush do i feed right after the flush ? Or just assume the feed next day ? 50% of fan leaves above the net ? All the black leaves are on the very bottom.
in my personal experience, with jacks 321, i as well as many ppl i know dont flush until last couple weeks before harvest (if they reuse the soil)
heres a chart
Airflow is EXTREMELY important. It can make the difference between rock hard solid clean nuggs, and a mold infested show.
Plus the wind simulation helps strengthen stems and branches and the stronger the supports the less the plant has to use energy to use to support itself so the more she can put into buds.
thats kinda crazy, my first thought when i seen the first pics was “dang, needs defole bad” lol but i guess I’ve seen ppl that never touch a sheers and just let it go wild so i wasnt sure what u were doin there hahaha
I would clean up everything below the trellis. The AC infinity oscillating clip fans are perfect to put down low blowing up through the canopy. Better bud and you’ll thank yourself when it comes time to trim those hippy chicks.
Thanks for the help to those that replied. Here’s what i did this morning. I didn’t flush, the majority suggested not to. I increased the ph to 6.2 / ph out on the 4 = 6.2-6.2-6.0-6.3. And changed my Jacks mix to A= 4.0 B= 2.2 E= 1.0 as @Graysin suggested. I did a defoliation on the bottom as @PurpNGold74 suggested and thinned out some of the bigger fan leaves as @Nicky suggested. After looking at pictures of the top I think it might need thinned more on top. I’m really afraid of trimming to much on top.
Thanks again any other suggestions are welcomed. As I progress in my grow I’m most likely going to seek more guidance . My only other grow experience was 4 years ago under Hps light. The heat was brutal and electric consumption was 100 dollars more on my electric bill. Boy what a difference using HLG 600 light. Coco and Jacks is a game changer !
show.
