k def, salt buildup, ca overdose?

[l orange bud l]

hi guys, no sick plants section?

my last crop was a disaster. yellowing leaves from 3 weeks into 12/12 and half yield by harvest. now the same thing is happening again.

plants are a foot or so high in veg, 6.5l pots. watered every day with .9 ec and 5.8-6 ph. runoff was comming out high even tho they were only on .6-.9 ec. they were having .1-.2 of calmag which iv stopped thinking they dont need it in veg. tap water is .2

now the ec is comming out .1 lower than feed in which has left me scratching my head as i thought it was salt buildup.

no camera but all middle leaves are dying from edges and mg def. new growth is pale.

using pm nutes and canna coco. gna switch to hesi for bloom. is plain water flush ok? people say no, but when i flushed with nutes before the problem got worse.

plants look very hungry. please help, i need some weed this time

cheers

 

[l orange bud l]

plants get 1l of water a day and pots are always heavy. gonna try and do it so they get a bit lighter by the next feeding as i think over saturation has not been helping.

 

[Ziggaro]

.9 is pretty light. I had purple stems, yellow leaves and what looked like tip burn at 1 ec of hg cocos base nutrients. I flushed with calmag and low strength nutes about 1 ec just to make sure my buffer was set and then raised the Ec of base nutrients up to 1.4 and they exploded.
If I run into problems now that is my protocol. good luck!

 

[Ziggaro]

btw there is an infirmary section but youll often get non coo-specific advise which may not always help. i doubt watering everyday in that size pot is a problem..

 

[I wood]

Mystery deficiencies starting at around three weeks and reduced yields could be winged root aphids. They exist only in the root zone, at first,and are very hard to see, about the same size as a piece of sand. When the population gets big/old enough a generation of flyers is produced and they show up in buds and sticky traps.
Check the root zone well, hopefully I am wrong.
Good luck.

 

[l orange bud l]

im pretty sure iv overdone it with the calmag and locked out k. does that sound possible? think ill do 2 rezs, one with calmag and one without.

i have noticed some gnats but they never caused this problem before.

do u guys plain waater flush? cant see ph being a problem if i feed straight after?

 

[Ziggaro]

no plain water flush..not exactly sure what your issues are but like I was saying..reset your buffer and increase nutrients. K is not going to lock out at those levels yes plants need camg in veg...
could be bugs but at 3 weeks flower nutrient demands are elevated so thats probably why u had problems especially if you were feeding at similar levels to now.

 

[NEGT1]

I doubt you over did it with .9 EC. You would be surprised how much some varieties can take mid flower in terms of EC. Definitely would see what others have to say, pics would help. Might soley be Mag. This is where calmag is tough because it's not just mag, and if you're adding proper ppms of cal you don't need more so a mag additive is needed in rare cases. I have a cut that loves mg during bloom, so it gets both calmag and mag adds...

What calmag sup are you using?

 

[DropDropDrop]

Im still kinda bummed about people watering small plants in big pots everyday with runoff. Dont drown your plants. In my opinion you should go about pot sizing in a way that everytime you water and feed the plant it actually needs it.
Im 100% sure you are overwatering, if the plants arent 3 feet wide and you are blasting them with shitloadoflight. How old are they? You get all kinds of lockouts from overwatering. Dont water everyday, let it dry a bit, not go to bonedry but so you feel the pots are really lighter.
I Might also lower the ph a bit for a test, but i dont think that really is any kind of problem and something you really dont need to try before you get the watering straight.

Did you start the plants in 6,5l pots? You should start them in smaller pots, it's way more easier to grow them that way. Next time start the plants in small (around 0,5-1 litres). Even in them you dont need to water everyday.

About the watering, the plant below is 70cm high from the pot, so a bit more than 2 foot. It has only now started to need one watering a day and it is in 2,4 litres pot.

Hope your plants will recover, growing in coco is easy as 1-2-3 when you get the hang of it.

 

[l orange bud l]

sorry i was talking about my last crop that was 3 weeks in bloom. these plants are about a month or 2 old from seed. the first month they werent growing due to overwatering. i havnt switched yet because they are very pale with dying leaves from the edges. ill try get a camera.

im using plantmagic calmag+

started them in half litre pot, the one litre pots and now 6.5 with good roots. do you guys let ur pots go a little light in between waterings? these havnt had chance to dry as iv been heavy watering trying to get the runoff ec down.

trying to understand cec. ziggao, you say to reset the coco with half a+b and half calmag but wouldnt that further the k lockout? how much calmag do u guys use for veg? i always go by ec over ml per litre which i wont be doing any more.

 

[l orange bud l]

is there a way to get emailed when my thread is replied to?

 

[DropDropDrop]

Well my bet is that you are still overwatering the plants, i dont think there is no way a one foot plant that has been having problems growing will fill a 6,5 liter container with roots near enough.

 

[RedBeardy5]

Ok, after the first 2 weeks in flower for three of my grows I got thrips. I could not figure it out, leaves we're turning yellow starting at the bottom going up.

 

[cannacultural]

I had a similar issue last run, thought it was K def. I've now put in down to salt build up and possible pH imbalance. .9EC is rather low, given your starting ec is .2. Plant growth is limited to the nutrient of lowest availability, so upping the EC a little might be an idea - I normally go 1.2-1.4 through veg, pH 5.6 for the most part. Don't over do the calmag unless your base nutes aren't offering enough. 6.5l pots shouldn't need watering every day - I'd be doing it every second day, with a higher EC should balance out - you may be over flushing the plants as it is (as others have suggested, over watering)

 

[l orange bud l]

Well my bet is that you are still overwatering the plants, i dont think there is no way a one foot plant that has been having problems growing will fill a 6,5 liter container with roots near enough.

i think you could be right. but the roots are comming out the bottom. wasnt overwatering from the start, only since i had high runoff ec so there is a good rootball.

so now the runoff ec is .1 lower than what goes in but the runoff ph is 5.4 which doesnt make sense to me. i thought it would be the same as what goes in or higher.

i have upped feed to 1.2 and letting pots go a bit light between waterings as they were just heavy all the time for last few weeks. cut out calmag as i think that is one of the problems. now im going to pots up into bigger pots as all else has failed.

is it possible to still have some salt buildup when the runoff ec is lower? after reading all the threads online, im pretty sure its salt buildup causing all the problems.

 

[theother]

i think you could be right. but the roots are comming out the bottom. wasnt overwatering from the start, only since i had high runoff ec so there is a good rootball.

so now the runoff ec is .1 lower than what goes in but the runoff ph is 5.4 which doesnt make sense to me. i thought it would be the same as what goes in or higher.

i have upped feed to 1.2 and letting pots go a bit light between waterings as they were just heavy all the time for last few weeks. cut out calmag as i think that is one of the problems. now im going to pots up into bigger pots as all else has failed.

is it possible to still have some salt buildup when the runoff ec is lower? after reading all the threads online, im pretty sure its salt buildup causing all the problems.

What is your environment like? Temps rh, light, co2 etc

 

[l orange bud l]

What is your environment like? Temps rh, light, co2 etc

i think its 24-5 lights on and about 20 lights off.

no c02 sadly.

1 600w light, 2 fans and extractor fans.

humidity is around 60.

i think these pm nutes are bad for salt. had 1 good crop and 1 failed. gonna change to hesi for flowering. does anyone no if they are ok for drippers? think i read somewhere that they are incompatible.

gta flower soon and plants look fucked. will get some pics for u guys tomo.

 

[theother]

i think its 24-5 lights on and about 20 lights off.

no c02 sadly.

1 600w light, 2 fans and extractor fans.

humidity is around 60.

i think these pm nutes are bad for salt. had 1 good crop and 1 failed. gonna change to hesi for flowering. does anyone no if they are ok for drippers? think i read somewhere that they are incompatible.

gta flower soon and plants look fucked. will get some pics for u guys tomo.

Interesting, temps seem good but my advice would be get at least a min maximum recording hygrometer if not a data logging hygrometer. Sometimes youll see a grow that looks legit temp and RH wise when you glance at it but when you see it over the course of the day you can see that parameters are less than ideal for much of the day.

What are PM nutes?

Honestly, this opinion is not going to be popular, but its not usually the nutes. You are in a good range, on the light side, worried about what you should etc, I would start to examine the environment, watering habits, pruning techniques lamp height pests etc.

Pics will help, the mere fact that your not overfeeding is a sign things might work out for you yet!

What EC is your tap? I didn't think about you using tap and your total ec being .9, that might be a little low, that would be right around what i would feed in veg with RO.

 

[l orange bud l]

Interesting, temps seem good but my advice would be get at least a min maximum recording hygrometer if not a data logging hygrometer. Sometimes youll see a grow that looks legit temp and RH wise when you glance at it but when you see it over the course of the day you can see that parameters are less than ideal for much of the day.

What are PM nutes?

Honestly, this opinion is not going to be popular, but its not usually the nutes. You are in a good range, on the light side, worried about what you should etc, I would start to examine the environment, watering habits, pruning techniques lamp height pests etc.

Pics will help, the mere fact that your not overfeeding is a sign things might work out for you yet!

What EC is your tap? I didn't think about you using tap and your total ec being .9, that might be a little low, that would be right around what i would feed in veg with RO.

pm is plant magic. could overflushing cause a nute imbalance?

 

[l orange bud l]