Trying to find cause of yellowing/dying leaves

[Dirty]

okay, it seems as though the leaves on BOTH my tables are yellowing and dying. so far it's just the fan leaves. I couldnt give a definite answer to what it was so i just had a few q's for whomever may stroll across this thread.

in the past week (since this started), i have...
1.put a hotshot no pest strip on a fan, which is blowing directly onto the plants (i have a spidermite problem).
2. i have placed some rockwool slabs underneath my rockwool cubes, to give the roots extra room to grow. I didnt soak the slabs in conditioner, i just put it in basically plain water with maybe a TINY bit of nutes, like 1/8 str if that, and let it bubble overnight at 5.4-5.5.

now, when i put in the slabs, which was mostly plain water, i waited 2-3 days to water again, when i did water again, i used plain water, to try to flush the excess salts and whatnot out. in doing so it means the plants basically had nothing but plain water for about 5 days.

the first table is 29 days into flower the second is 15 days. the veg table i have going has shown no signs of yellowing leaves, but i didnt put any slabs under the cubes and the pest strip isn't blowing on them, though the veg room is open air to the flower room, meaning the pest strip is getting to the veg room.

i guess my Q's would be
1. has anyone had any ill effect with their plants after placing a hotshot no pest strip in their room?

2. could placing slabs under flowering plants stress them like when using dirt?

3. could 5 days with clean water (no nutes) cause the plants to yellow REALLY fast???

the fan leaves all look like a nute def., but i know they gotta be getting plenty of N, using GH and botanicare CAL-MAG which has N in it.

appreciate any responses, i can get pics but it's gonna be 24 hours cause lights are off right now.

Stay safe,
Dirty

 

[sproutco]

the fan leaves all look like a nute def., but i know they gotta be getting plenty of N, using GH and botanicare CAL-MAG which has N in it.

I assume gh means general hydro. Which one and how do you mix it? What ph are you using now? I don't recommend no pest strips especially in flower. You don't want to be smoking a nerve poison. Try neem or safer soap instead.

 

[Dirty]

Sorry for not clarifying, it's GH flora series. ph is set to 5.7-5.8.
i think what really did it was when i put the rockwool slabs underneath the rockwool cubes when they were already a few weeks into flower. I didnt put the slabs in conditioner just set it in bubbling water at 5.5 ph.

and from everything i heard, alot of people use the no pest strips in flower, but mostly all of them take the strips out before cutting the plants.

it's just a weird stroke of luck with my grows lately and this time i really can't pinpoint what it would be.

 

[sproutco]

pH's "Lucas Formula" values for 8ml micro, 16ml bloom
n 130
p 106
k 183
Mg 73

For flower, the lucas formula might work ok for your blooming plants. It does have alot of p which i don't like. It is 8 ml micro + 16 ml bloom per gallon of water. This would give you about 130 ppm nitrogen. Probably too much. So reduce the strength to 3/4. This would give you 100 ppm nitrogen. 6ml micro + 12 ml bloom. Don't use cal mag plus with this. You don't need extra calcium or magnesium and can cause problems.

GH's baseline Flora Series, the 3 bottles, green purple and red, (different from Flora Nova series) veg formula
GH 15grow, 10micro, 5bloom
211 n
46 p
263 k
40 mg

Use 1/3 strength veg formula on small seedlings. increase to 1/2-2/3 strength on larger plants. This should be plenty. You could add 1/2 teaspoon cal mag plus to add 8 ppm magnesium. Just a little more mag.

 

[Dirty]

pics...

i'm feeding the girls at bloom-15, micro-7.5,grow-5.0, but i'm only feeding at 3/4's, and yes i've also been feeding the calmag plus, and also hydroguard.

 

[MTF-Sandman]

Looks like they've probably been seriously rootbound which is causing the nute uptake problems...the nute levels should be fine - now ya just gotta get em to be able to use the nutes that are there. The problem is by the middle of flowering, root growth seriously slows even with healthy plants, so that's gonna make it alot harder to get em fixed up in time for harvest.

 

[yes_i_cannabis]

yea man..i don't know how ya gotem that big with fukall roots...i reckon whats happend is, ya flushed em heaps to much right at a crucial stage..the yellowing leaves are getting the goodness sucked out of them by the buds, all the nutrients available would be getting used in bud production...so ya gotta keep the nutes up to em...i recently did a similar thing in coco...but...me buds turned out fine..by the time she finished there were fukall leaveds left on her...

 

[sproutco]

Here is another formula close to what your trying

Here is another formula close to what your trying

Per gallon of water...

GH 3 part bloom formula
GH 5grow, 10micro, 15bloom
159 n
92 p
219 k
66 mg

3/4 strength: (3.75 grow, 7.5 micro, 11.25 bloom)
119 n
69 p
164 k
50 mg

Compare to Jensen's hydroponic formula...
n 106
p 62
k 156
ca 93
mg 48

That would be almost identical. This would be great to try...

Stop adding the cal mag plus. Your going to have too much magnesium and maybe calcium. This would cause a possible potassium deficiency. Your aiming for 4 parts potassium to 2 parts calcium to 1 part magnesium. The formula is already strong in magnesium. 164/50 = 3.28:1 k to mag when it should be less mag with 4:1 k to mag.

You were not using enough of the micro.

 

[Dirty]

i understand the rootbound theory on those plants, but i have smaller plants that were only 2 weeks iinto flower when i put the slabs under them, and they're getting the same thing. Only thing i'm doing different with nutes now is that i'm adding cal-mag, and as sproutco said i should stop, which i can believe, my first hydro grow looked pretty good when i finished them.

other than that i've been pretty up and up on things for the most part...i may end up pulled the earlier flowering girls and trashin them for hash, cause they look lousy, i rushed them into flower before they were ready just to fill up the space...mistake on my part....

will be posting a new thread probably in the growroom forum in a few weeks, i think i'll call it, "Pimp my ride? FUCK THAT, pimp my grow!!!", heh.

i got all the basics to really start pulling in some heavy crops, 2k flower room, with winter coming i can keep my temps with light on as low as 68, and every other basic thing, i think i really just need some help on how to really tweak everything.

anyways, i'm rambling, and that ramble is for another thread another day in another forum.

appreciate the input gentlemen,
Dirty

 

[guineapig]

Other than the yellowing fan leaves, i think you are doing a good job!!!

Are you unhappy with this slab system, somehow? perhaps should more nutrients be in those bottom slabs so the roots can absorb more nutes?

yer pal guineapig

 

[Dirty]

well my thing is this, from here out i think i'll add the slabs as soon as i put them into flower.

i think my real issue has been finding a great mother plant, have 2 superskunks, and 2 AK48's, all from nirvana seeds, i found the two stretchy culprits, but the one stretchy superskunk apparently has a purple pheno to it, it only showed it this grow, or maybe i didnt notice it last, and now temps are colder.

but i wanna perpetual harvest, every 4 weeks, and the probs with the mums i havent had a full 4 weeks to veg out my clones, otherwise i think they'd be much more filled out resulting in a better yield.

i dont say it but i'm really concerned about these grows, not just cause i love growin but cause i've been pawnin off mostly all the bud, cause i need the money cause my job's put me in a real bad spot the last year

 

[10k]

There is nothing wrong with your gh mix plan dirty, although it may be a little weak.
You are mixing the micros first in the water I hope ?

now, when i put in the slabs, which was mostly plain water, i waited 2-3 days to water again, when i did water again, i used plain water, to try to flush the excess salts and whatnot out. in doing so it means the plants basically had nothing but plain water for about 5 days.

THAT imnsho, IS the real culprit here which caused them to yellow so far up the plants this early in flowering.
But fear not, the buds should finish nicely provided you have the borg under control.

ps... edit added side note...Also btw...you realize that on the slabs (if the slabs are sitting on a tilt like they should be) the nutes will pull through the cubes much more thoroughly than they did off the slabs, meaning the drip cycles may need to be more frequent than before.

hth

 

[Getawaymonkey!]

no pest strip isnt the problem ...I use them all during my grow and have had no problems whatsoever,..other than smoking too many bongs during

 

[Dirty]

sorry guys

sorry guys

i apologize for not replying sooner, works been crazy past week.

Plants are getting flushed with plain water and some "final phase" from AN.

so 10k you believe that i could actually go over the 3/4 of 15bloom-7.5micro-5grow???

i ditched the young flowering plants, and have now stocked the table with some new plants, just a few days into flowering now. still not filled out as much as i want but i partially blame that on 2 of the mums, seem to be alittle stretchy and i must've not really noticed it, but one of the SS mums is NICE and stocky which i really like.

i have seen NO mites/mite damage recently, although i havent really been lookin for them, but i have seen no damage on new leaves lately.

from here out when i put the slabs under the girls i'll let them soak in nute water at 5.5ph

appreciate the responses everyone,
Dirty