I need some assistance with one of my plants please...

[RubyW]

I am growing 4 Northern Light Autos in a 4x4m tent. With the current weather we're having, I have set up a heater fan combo to regulate air around the tent better and it's been keeping a pretty consistent temperature. It started from the lower fan leaves and progressed to the top. From the pictures attached, you can see the difference, one taken today and the others that were taken 7 days prior.

Soil, hydro or coco?: Hydro

Strain: Northern Lights

Photo or Auto: Auto

Plant age: end of 6th week, begun flower over a week ago

Pot size: 10L, with 4/4.5L water

Has it been repotted? and when?: Upgraded pot size from 5L 2 weeks ago

Air temps (max min): 20*-22*

Res temps (max min): 19-20*

Humidity: 60-65%

Lighting type and wattage (hps, led, cfl): Mars Hydro 300W LED

Light schedule: 16 on, 8 off

PH level: 5.7-6.3, occasionally dips to 5.4/5.5

EC (hydro and coco only) - 500ppm

Background EC -

Feed schedule and nutes (for hydro and coco) - Once a week with water changes, General Hydroponics - FloraGro, FloraMicro & FloraBloom, Pythoff

Anything else you think may be relevant! I haven't figured out why the PH drops so low, this plant is the heaviest drinker out of all 4, drinks at least 4L per week. I have been trying to get the humidity down to 45% now that they're flowering but it's been a struggle



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[Jingo]

Welcome to the forum Its the pH swings giving you issues. This post will help you adjust your feed to keep pH under control https://www.thctalk.com/cannabis-for...y-tell-you-and.

Bubble buckets in a tent is brave, even with pithoff.

J

[RubyW]

Hey, thankyou for the quick response and welcome! Alright, I'll give that a go, the rest of the bunch are doing quite well for the conditions outside so I'm grateful for that. I had tried soil and other methods but I've had the best grows with hydro bubble buckets. It's my 2nd time using General Hydro, most people said it's up in the top 3 nutrients to use in Hydro and have been trying to stick by the bottle guidance & EC range given. Fortunately, the only time I ever had issues with the roots was during the crazy heat waves but I used Chill and that worked wonders! I'll post an update over the next couple days/week and thanks again

[Jingo]

I did GH and bubble starting out, then I switched to coco. Coco for the win, you should give it a go.

J

[MadJohn]

Bubble buckets in a tent is brave, even with pithoff.

J

Explain?

Mine went great last grow (well apart from it stretching to the moon). A LOT less work than coco.

Did I miss something?

That looks like cal/mag deficiency to me.

MJ

[Jingo]

Explain?

Mine went great last grow (well apart from it stretching to the moon). A LOT less work than coco.

Did I miss something?

That looks like cal/mag deficiency to me.

MJ

It can be difficult to manage res temps. Coco uses the same ec\pH stuff and gets same yields with less effort.

[barney_b]

*nods in agreement while dusty bubble bucket experiment and empty jars lacking lilac diesel mock me from the closet*

[RubyW]

Haha thankyou to everyone who's responded, I have tried Coco before, that was one of my first couple attempts actually. It didn't go as badly as soil did, I have just found growing with the bubble buckets easier to manage - the only trade-off being taste, plus I kinda seeing all that greeny growth.
It isn't , or shouldn't , be cal/mag deficiency - which if I had properly stated (my bad) I have been using calmag since a couple weeks in to the grow and have stopped I believe, a week ago. With the previous grows, every single strain, every single plant, starting showing magnesium and calcium deficiencies before or by around this point thus I don't think it is..if it is wow OK - no magnesium though and as far as calcium, the spots aren't on the veins and don't really match majority of the photos I have looked at. It was my first guess though when it very first started.

Another couple things I'd like to add - again I am really sorry would have helped if it was said earlier on -
I am using a reverse osmosis filter, as I live in the city and we have some horrendous water, so my background EC is virtually 0 (nothing shows on my EC stick) which I think may also be the reason for my regular calmag deficiencies prior. 2nd, as their autos, for safety I always started on a lower dosage of nutrients when starting the grow, as most people on Google have said that Autos do not need as much nutrients as Fems... either I have been getting some dodgy seeds or the guide on the bottle is also a reserved quantity, but almost all of my plants have been very, very hungry. They showed deficiencies within the first couple weeks, and once I had given the correct dosage they were all green as the hulk, until now that is. Regarding the res temps, I have been doing my best to regulate it but it's a bit tricky as I am based in the UK and the weather here has been unforgiving. Unfortunately I am not able to keep the water temp down below 18* without jeopardising the tents temperature, which when I go to do my daily rounds, easily falls to 17* after just 10 minutes. I have reinstalled the extractor fan I had on previously (again, was removed to better regulate temperature) which I have plugged in to my humidifier sensor so only comes on , alongside my dehumidifier, when needed. This has helped with bringing it down to around 50% or so, which is a big improvement as over the last couple days it's been at 80% .-.

I have been taking daily EC readings and will continue to do so until Sunday, if anything else comes to mind I should mention I will, I will post some pictures of the rest tonight as well as a update on the sickly one, if anyone else has any suggestions I would really appreciate it

[Bud Lightyear]

Pot size: 10L, with 4/4.5L water

10 litre buckets is that correct ? How exactly are adding the Cal-Mag to your feed solution ?


Regards BL

[RubyW]

Hey Buzz, Yes, I had moved the plants into bigger pots about a week before they began to flower as they outgrew the 5L pots, with all of them having 3-4L of water in the 10L buckets. I premake the nutrient mixture in a 10L water container, let it sit for at least 15 minutes if I don't have a lot of time, but I tend to leave it overnight in preparation for water change day, and individually pour out the mix into the individual buckets. I use Vitalink Cal Mag, and follow the 1ml/L as stated on the bottle. Has my method been wrong?
Also, not sure if I am going to get some disappointed looks, but I don't run a reservoir, the res temps I put down were for the bucket water temps, sorry for the misinformation and not clarifying sooner. I was going to set one up but I ran into some issues with the supply company and as this is now going to be my last grow for a while, didn't prioritise getting another one ordered.