Oy vey! Nutrient burn?

This is my third hydro grow, and so far it's been a bit problematic. Some background...these are two feminized 'Oasis' plants, and I've been upping nutes over the past few days (using ec meter to measure levels). Yesterday I bumped it up to .9 from .7, and this morning I found one plant all shrivelled up and the other one, while looking OK, with yellow spotting on the leaves. I threw two litres of fresh water in there, adjusted PH, and brought nute levels down to .7. Should I simply wait and hope for the best at this point?
best
jash

It DOES look like a pretty good case of nuteburn...I'd drop your ec even lower for awhile.....like to about .5 at the most for a few days and see how (or if....) they bounce back.

Keep a close eye on your ph.....it usually rises like mad during nuteburn and causes its own problems.

Good Luck.

OK, I'll drop the EC even lower...will post new pix in a couple of days if they perk up. And am definitely keeping an eye out on the ph, though all looks well on that end. Thanks for the advice.
best,
jash

That is not nute burn, that starts with the leaf tips. I would be more inclined to look at the PH levels which should be around 5.8 - 6.2 for hydro.

:cool:

Thanks for suggesting the ph...all I can say is that my ph levels have read 5.8 - 6.0 max for the last two weeks consistently, which is why I thought it was nuteburn...just noticed that some roots actually made it into the NFT reservoir...while this happened last time I had a (happily trouble-free, wildly successful) micro-grow, it didn't happen until they were way into flowering mode...any thoughts on roots in the tanks?
best,
jash

Quote:

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Originally Posted by TomStoner

That is not nute burn, that starts with the leaf tips. I would be more inclined to look at the PH levels which should be around 5.8 - 6.2 for hydro.

:cool:

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I thought that was the ph level for soilless mediums. I thought Hydro was like 5.3-5.8.

Can anyone clarify just for my own personal arsenal of knowledge I'm trying to acrew? :thumbsup:

I keep my ph between 5.5-6.2 for hydro Dai.

PS.....jash keep doing what you are doing. Do they look the same, better, or worse today?

Usually in nuteburn your plants grow SUPER well which may explain the large amount of roots.....and then somewhere you cross the line and add too much and so POOF.

Do the roots look healthy and what are the rest of your specs?

Hey Weedhound...yes, the roots look healthy...and, having lowered the nutes down to .5 per your recommendation, I'm happy to say that just 8 hours later I can already detect slight improvement...so, I'm going to keep ph around 5.8 or so, and keep nutes to .5 for three days, and then ease them much more slowly up again...though i was planning on flowering in three days...do you think i should wait, like, 5 more days before kicking them in to flower so they have some time to recover? (when vegging i put them under 24 hours of light)
all best, and thanks,
jash

Hey daihashi,
Check this chart out, I usually run my ph 5.85 in veg...6.0-6.3 in flower..but to each their own....I like my results with those numbers...Hydro on the left side, soil on the right..

Peace,
Treetops :hippy:

Jash, I would wait if I were you.....you will want a couple of days to see exactly what the after effects will/won't be before you turn them.

hey weedhound...will follow your advice and see what happens then...was going to put them under 12/12 tomorrow, but i'll wait until wednesday...the veg nutes i use should (at least according to canna's own instructions) continue to be used in the flowering cycle until the first sign of flowering, so i won't be changing (or adding!) nutes at all in the next few days. if you'd like, i'll update with pics on wednesday....hopefully i can save these girls!

i've only done two other grows before this...also using nft...and there were simply no problems...the first was nirvana bubbleicious, the second was snow white...but those seeds weren't 'feminized'...are there generally more hiccups with feminized seeds in your (and other's) experience?

oh, and i almost forgot...the one plant that's all shrivelled up was topped after showing four sets of leaves...could this explain her extreme reaction to the uptake in nutes compared to the other plant?

apologies for having so many questions! i'm still a 'newbie' like they say...
all best,
jash

If they are the same strain, it's funny they should react SO differently to the nutes. I don't think topping would have anything to do with how much nutes they uptake....not that I have ever heard anyway but I suppose you could put it down to stress.

Do you have a photo of how they look now? We want to be sure we are moving them in the right direction....you are thinking they look better?

I think they're looking a little better...I was going to wait on sending pics until Wednesday, but since you asked...note how the tops of the plants seem to have perked up some (at least to my perhaps overly optimistic mind)...

I really appreciate your interest and concern and advice!
best,
jash

I agree...they are better. You may lose some leaf tips or even some leaves and roots...but I think you caught it quick enough to keep them in the game. :thumbsup:

Edit: You're quite welcome. Keep me updated. :)

Its the heat baby. Get the lamp higher.

Well, four days after my last post and the two girls are growing ... but, I must admit, they do not look half as perky as my last two grows... herbie says it's the heat...and many of the leaves are dry to the touch...and yellow spotting and leaf-tip burn continues to plague them....but...

....there's been a serious cold snap where i live ... the girls are growing in my cold attic (albeit in a self-enclosed light proof box with intake and outtake fans)...and my friendly hydro salesman suggested i use an aquarium heater to get the water up to about 24 C. Indoor temps are about 28 C. Does this sound alright to all of you out there? Lamp is 250 HPS, about 10 or so inches from tops of plants.

all best and thanks,
jash

Don't worry about rasing the water temps right now. Also, the damage that was done to the plant leaves won't go away, but the new leaves will be good once the issue is fixed.

Put the back of your hand at the height of the leaves and lift the lamp until you don't feel any heat.

You'll be good again in no time, don't stress.

Ok...the conversion I am getting from C to F is 82F from 28C. Is this correct because that doesn't sound cold at ALL to me. Ideal temp for water IS 75F (24C) but I'm missing what your are saying about the "cold snap" and the 82F degree temps.

Sorry if I wasn't clear. Indoor temps have consistently been around 78 F. Nutrient/water temps have been around 60 F, until I got an aquarium heater yesterday and bumped it up to about 70F.

I've got some more (pathetic) pics...note the abundance of roots already floating around the reservoir itself...

...after two great grows, this one's turning out to be the sad one:(. I'm going to keep them vegging until the leaves turn green or until they die (sob sob). My friendly hydro guy's latest theory is that now they're not getting enough nutrients...the EC meter reads .7...he suggests bumping it up to 1.1, given that they've been vegging for three weeks now...he also suggests taking the lights from 24/24 to 18/24.

all best and thanks
jash

I don't understand the purpose of 18/24, did you mean 18/6 ?

I think that you will see improvement now that your res is approaching the correct temperature. You should be running it at a comfortable room temperature, and 60'F was WAY too low, brr!

Thanks...water's right, so all I can do at this point is keep the PH good and cross my fingers.

And yes, I meant 18 hours light, 6 hours dark...

Will post pics if they get any better. Thanks all for your help!
best
jash

I'm definitely with Stinky and your hydro man......60F is WAY too low.....yep that could have a LOT of effect on your plants.

I'm not unhappy with the way they look consdering the issues......I'd go VERY slowly in upping nutes and give them a few days between each change (about 48 hours) to make sure they aren't going to have a bad reaction.

...will do weedhound...bumped up the ec to .9, water temp and PH are just where they should be...will wait 48 hours, and see what happens...apologies for not mentioning the icy conditions of the water earlier...being new to all this, it didn't really strike me that might be an issue as silly as that sounds! will post pics sunday...

again, many thanks!
jash

...well....thanks everyone! As I hope is clear from the pics below, new leaf growth is a lovely green, and all is well with the girls after many hiccups:thumbsup:...my only questions at this point are:

1. Can I put them on 12/12 now, or should I give them one more week just to be safe? (I'm hesitant to do this though as I don't want them to get too tall, but I did succesfully supercrop my last grow so I guess I can do that again).

2. Would you recommend pruning off some (like, two sets of) the extra-yellow, dry leaves below the nice new green growth or should I just leave the girls alone?

I'm so glad I signed up to this forum!
best
jash

hey I've had the same problem as you pretty much. Sometimes it manifests at the tips, and sometimes around the edges, depending on PH, water content, nute content..

my PH is 7 a lot now :( which has me worried, I've been giving nutes to try and make the soil acidic.. not working (yet).

Checkout my grow log below homes,

Peace,
Denial

I am in the presents of those posessing information and wisdom, thanks.

You can put them into flower if you want. If you have a height issue than you should be cognizant of that for sure.