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[newgrower2018]

- lots happening here,.... so before they yellowed, they had dry-out bad enough to cause drooping? After that, how long were they exposed to the cold during lights off? Have you been feeding full strength, or dilute? What did you see in the leaves that made you think it was nute burn? I'm not sure I see those symptoms here, and a little tip/margin browning is a pretty generic symptom, could be caused by several things,...
Things are pretty advanced, hard to say what's causing what now,... The dry outs hurt the roots, also causes pH to drift out of proper range usually too,... hurt roots don't absorb water or nutes well until recovered, triggering defc. symptoms... On the other hand, overwatering can cause the same droops, but for different reasons, so be careful not to let it swing wildly the other way...
- plants look light color all over, but worst near the uppers? I'd say some P defc. is going on, but maybe a micronute defc., S defc. as well, things are muddied here now,... but if you've feed lightly, with already mild nutes, then flushed (making matters worse for nute availability, not knowing if it's a pH problem yet), I'd lean more toward plain lack-of defc.'s happening, but pH lockout is a distinct possibility still,... The cold impairs uptake and transport of several nutes, P and Fe are really bitchy about this in fact... upper 50's down can start problems if it persists long enough.... Look into getting a pH probe, a less $$ good alternative to pro' models is the Accurate 8 soil pH probe (forget the skinny probe cheapies you see around, they suck!).... Run-off is not accurate, and digging up a small holes worth of soil for a slurry test isn't a the best option either, though if done right, with enough material, it'll offer accurate pH readings...
-- the droops... if they got really dry, then it's possible some dry patches are in those pots,.. have you hefted them, stuck your finger down in there to confirm the pots are evenly and well watered? Sometimes the medium becomes oddly repellent, difficult to rehydrate (coco especially) and creates persistent dry patches withing the pot, even if it seems watered well,... a wetting agent is the ticket for that fix... Sometimes the posture partly stays that way permanently too....
...best advice pending the info needed,..... some of it ties together for sure!

Hi thanks for your help. They had dryed out alot some leaves where Crispin up they were exposed to low temps for 6 hours but i had a heater on to try keep it up dont think that helped with the dry air. I thought nute burn because of the burnt tips i just googled it and I thought it was that. There were dry patches when i went to flush it on the bottom of my pot tso make sure the full bottom evenly wet now. I was wrong with my dates they were flushed 14th Jan and since then they been watered twice times and had 1/4 nutes then half yesterday with some cal Mag. That is them just after. Is that probe any good and do u need any more info not sure if i answered all your questions

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[newgrower2018]

Few spots on some leaves and one of them has crinkly leaves the youngest is the most yellow

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[Citadel]

Having used BioBizz soil and nutes for a year or more Id say you had those issues from the start All Mix cooks Autos I'm my opinion it's way too hot. I've always used light mix since my first grow even, no major issue I use all mix once when I couldnt get the light never again I had 11 weeks of this crap. I'm no expert but I've seen patterns with growers using all mix for autos.

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[newgrower2018]

- lots happening here,.... so before they yellowed, they had dry-out bad enough to cause drooping? After that, how long were they exposed to the cold during lights off? Have you been feeding full strength, or dilute? What did you see in the leaves that made you think it was nute burn? I'm not sure I see those symptoms here, and a little tip/margin browning is a pretty generic symptom, could be caused by several things,...
Things are pretty advanced, hard to say what's causing what now,... The dry outs hurt the roots, also causes pH to drift out of proper range usually too,... hurt roots don't absorb water or nutes well until recovered, triggering defc. symptoms... On the other hand, overwatering can cause the same droops, but for different reasons, so be careful not to let it swing wildly the other way...
- plants look light color all over, but worst near the uppers? I'd say some P defc. is going on, but maybe a micronute defc., S defc. as well, things are muddied here now,... but if you've feed lightly, with already mild nutes, then flushed (making matters worse for nute availability, not knowing if it's a pH problem yet), I'd lean more toward plain lack-of defc.'s happening, but pH lockout is a distinct possibility still,... The cold impairs uptake and transport of several nutes, P and Fe are really bitchy about this in fact... upper 50's down can start problems if it persists long enough.... Look into getting a pH probe, a less $$ good alternative to pro' models is the Accurate 8 soil pH probe (forget the skinny probe cheapies you see around, they suck!).... Run-off is not accurate, and digging up a small holes worth of soil for a slurry test isn't a the best option either, though if done right, with enough material, it'll offer accurate pH readings...
-- the droops... if they got really dry, then it's possible some dry patches are in those pots,.. have you hefted them, stuck your finger down in there to confirm the pots are evenly and well watered? Sometimes the medium becomes oddly repellent, difficult to rehydrate (coco especially) and creates persistent dry patches withing the pot, even if it seems watered well,... a wetting agent is the ticket for that fix... Sometimes the posture partly stays that way permanently too....
...best advice pending the info needed,..... some of it ties together for sure!

What do you suggest they not looking any better ive just ordered the soil ph tester just the £15 one did you need any more info

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[newgrower2018]

Should I just give full nutes when they dry?

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[Waira]

....it's going to be a bit of a struggle mate.... After what you said about dry-outs, I think the roots are damaged, and that hinders everything, slows recovery,... best you can do is keep the pots moistened, but not soaked; feed more bloom nutes, 1/4 strength is far too weak..... that meter probably isn't very accurate, but since it's coming, let's see what it reads,...

 

[newgrower2018]

....it's going to be a bit of a struggle mate.... After what you said about dry-outs, I think the roots are damaged, and that hinders everything, slows recovery,... best you can do is keep the pots moistened, but not soaked; feed more bloom nutes, 1/4 strength is far too weak..... that meter probably isn't very accurate, but since it's coming, let's see what it reads,...

Hi I never ended up ordering the ph soil tester was waiting for your reply. I've just ordered it now anyway it will be here tomrrow its the dearest one i can afford right now. I gave them full nutes lastnite and think there looking a little better.i just dug my water ph tester into the soil and got readings from 6.6 to 6.8 don't think it will be accurate but was just curious

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[Waira]

it might be close enough, but we'll see,.. most seem to stay stuck around 7.0, and at 6.8, you're in lockout range for Fe and Zn,... Don't expect a big correction in leaf color and all that, some of the fade on lowers is normal at this stage,... buds seem to be filling in OK, and that's a good sign too!

 

[newgrower2018]

it might be close enough, but we'll see,.. most seem to stay stuck around 7.0, and at 6.8, you're in lockout range for Fe and Zn,... Don't expect a big correction in leaf color and all that, some of the fade on lowers is normal at this stage,... buds seem to be filling in OK, and that's a good sign too!

So it came today and it's just confused me more it's 5 at the bottom and goes up to 6.5 near top? How deep do you go to test for dryness to water them as well and do you think I should give them some calmag in there next watering

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[Waira]

sorry for the delay bud,....
That's the pH probes' readings? It makes sense, high pH at the bottom,.. think of it like a coffee cone filter, the bottom area is getting all the concentration from what's above, building up there first and worst,... pH will vary in different parts of the pot, in and out of the root zone, etc.,... So, overall, it's looking a bit too acidic... typically I take readings about mid level, so try there again, not after you've feed or used pH adjusted water, it'll skew results temporarily,.... As for the moisture reading, they are all arbitrary in that scale, so best do you own calibration of sorts,.. make up a small pot of soil, and test at few to several levels of moisture from nearly dry to soaked, noting the number... Ca-Mg, sure, that will help with some buffering too,... add that first always to whatever nute soln. you make up...