Bright Yellow Crispy and Curling Up Leaves!

I need advice please i don't want to loose them!!??
They are curling up and bright yellow so please i need some advice.

Day 25
Temp:26-28C Nights:20C
Humidity:40-55%
Ph:5.9 (But always rising.Last time it goes 6.6 than i put 2ml Gh Ph down.I mean it changes in one day.I'm using tap water.)
Water Temp:23C Nights:18C
My tap water's ec:160 so i add 1,5ml gro and 1,5ml micro than my ec:230 in this stage i don't want to burn them.
But they are seems bad
Also they are in the rockwools and i'm giving water like 15minutes every hour..

They don't look too bad, just a little hungry, and maybe suffering from the lights being too close,(heat stress) or needing more air circulation. Take care of those, work on keeping the PH in check, and they should be fine.

jawbrodt said:

They don't look too bad, just a little hungry, and maybe suffering from the lights being too close,(heat stress) or needing more air circulation. Take care of those, work on keeping the PH in check, and they should be fine.

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jawbrodt Thanks for your reply.

I'm keeping the PH like 5.6 but it's rising like 6.4 in 24hours..And you are telling me they can be hungry but if you look carefully they got a bright yellow and crispy leaves with a curling ups?
Temp is still like 28-29 with a %40-45 humidity And i got fan on them i mean i don't think it's from the air temps??
By the way my Water temp like 23C maybe this is the reason?
waiting for your advices.???
I don't want to lose my girls

today i gave them 12liters reverse osmosis water with 5.5 ph balanced no nutes!! so i can just wait now i hope they will be ok.? Please tell your advices

Today i came from work and when i saw them there is no changes they got still same sick so please somebody just give me a good advices please

Your temps are a tad high, and the humidity is a tad low. I'm thinking that those, combined with your light placement, is creating heat stress problems. What type of light are you using, and how close is it positioned?


Also, I still think they are underfed, if your pics are accurate? They look a little light in color, which is a sign of a nitrogen deficiency.

they are most likely still hungry. these signs are not nute burns but rather deficiencies. they are no longer seedlings, increase your EC by much, but do it slowly. if now they are on 230, increase to 400 today, and 500 tomorrow, etc, you should see them bounce back in no time, so far no damages but don't starve them like that.

if your water temp is too high you'll start to see signs that resemble overwatering in soil - meaning no oxygen for the roots. so far i don't see that, just deficiencies.

jawbrodt said:

Your temps are a tad high, and the humidity is a tad low. I'm thinking that those, combined with your light placement, is creating heat stress problems. What type of light are you using, and how close is it positioned?


Also, I still think they are underfed, if your pics are accurate? They look a little light in color, which is a sign of a nitrogen deficiency.

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Thanks for your reply
But everyone tells that 28C is a good temp with a %45 humidty wright?By the way i'm using 250w Hps with cooltube a distance of lamp 30cm..There is no changes they got still same sick?

asaph said:

they are most likely still hungry. these signs are not nute burns but rather deficiencies. they are no longer seedlings, increase your EC by much, but do it slowly. if now they are on 230, increase to 400 today, and 500 tomorrow, etc, you should see them bounce back in no time, so far no damages but don't starve them like that.

if your water temp is too high you'll start to see signs that resemble overwatering in soil - meaning no oxygen for the roots. so far i don't see that, just deficiencies.

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Yes i think you are right these signs can't be a nute burns cause i don't give them any nutes..?You know last time i flushed my waterfarm with a ro water with no nutes but there is no changes at all..?
+My system is waterfarm and my water temp:23C Lights on

so yeah, go for it, no fear. more nutes (when using hydro nutes) will also probably keep the pH a bit "cooler". No need to flush here.

and please, keep us posted for any changes, especially for the good. people will be seeing this thread years from now looking for answers, you can help them.

Cheers! I think your ph is rising due to the hydroton not being prepped right (washed enough & ph balanced). Whenever plants are showing stress I would back off the lights a bit until they show 'happy' again. I water mine 60sec. every 2 hours when they are little like yours, rockwool holds a lot of water. Check my sig line, at that size I water them 60sec/60min. 28c is a bit high without added co2, I would shoot for 25c during flowering (will keep the nugs tight). Water temps are too high, but ok as long as you supplement with hydrogen peroxide (plenty of info here). I don't use your nutes, I use A/B at about 5ml/g at your state of growth (if they are healthy).
Good luck!

28c is a good temperature and is not too high, ive had the temps over 40c lots of times, you say your ec is 230? is this 230 microseimens or 230ppm or ec 2.3?? if its 2.3 its miles too high for those little plants, on the other hand if its 230 microseimens its too low if its 230ppm at the .5 ratio as opposed to the .7 then its still too low you want it about 350ppm and gradually increase it as the plants get bigger. in vege i wouldnt go above 450ppm.

Sure you can get away with 'not so perfect' conditions, but there are very well established perimeters that people should follow. That way they might not end up in the 'plant problems' forum! High temps equals loose and stretchy bud, unless you are supplementing with co2!

I clone with nutes at 300 to 400 ppm, I think your plants are starving. I have found that if you use a silica admixture with your hydro, and then ph your reservoir it will remain much more stable. Also if you have happened to have added a cheap airstone to try and add oxygen to the Waterfarm, that could be the culprit.

28c is NOT high temps. 27c is optimum for MJ, and 30 is max. 28 is just good.

Again me friends with a new problem..
I need some help for my sick girl.Old Leaves seems like that so please give me some advices.
PPM:200 (with 12liter water)Nute:Gh Micro Gro Bloom(i'm just giving Micro and Gro for this time)
Ph:5.6 (it was 6.3 last time)
Temp:Max:29c Min:21c
Water Temp:Max:23c Min:17c
Humidity:Max:%60 Min:%35
Light:32cm away from the top of the plants(250w Hps with cooltube)

Waiting for your advices please..I don't want to loose her

i think the advice you were given last time still stands. 200 ppm is way too low for these plants, they should be on at least 600 by now. up it by 150 each watering. you plant is small for its age. the pic btw shows a magnesium deficiency, can be corrected with epsom salt (magnesium sulfate). but from your data, it's more likely to be N def.

asaph said:

i think the advice you were given last time still stands. 200 ppm is way too low for these plants, they should be on at least 600 by now. up it by 150 each watering. you plant is small for its age. the pic btw shows a magnesium deficiency, can be corrected with epsom salt (magnesium sulfate). but from your data, it's more likely to be N def.

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I agree with Asaph I think if you just up'd your nute to normal levels your plants would respond. Have you started to foliar spray?

asaph said:

i think the advice you were given last time still stands. 200 ppm is way too low for these plants, they should be on at least 600 by now. up it by 150 each watering. you plant is small for its age. the pic btw shows a magnesium deficiency, can be corrected with epsom salt (magnesium sulfate). but from your data, it's more likely to be N def.

Click to expand...

asaph thanks for your help.i'm gonna listen to you and Today i'll up my nutes like:Micro:5ml Grow:10ml Bloom:3ml i hope it gets better

sparkafire said:

I agree with Asaph I think if you just up'd your nute to normal levels your plants would respond. Have you started to foliar spray?

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Ok i'll up my nutes and than we'll see the changes..By the way for your foliar spray advice no i don't..Do you think should i?