Leaf problem, curling, drying *HQ PICS*

hey, here is my latest visible problem on a young tray of clones.

ph- 5.8

nutes= 500ppm GH floragro

temperature= 60-65 with a possible dip into the mid 50's.
feed schedule= 3min flood every 4 hours.
medium = pebbles only


It looks like the leaves are drying out and sometimes curling on the edges. Check out the High quality pictures and tell me what you think. Any input is appreciated. Ignore the possible powdery mildew problem, which is more apparent on the lower leaves. I have a sulfur vap.

I don't see any high quality pics . . . Are your clones fully rooted? How clean is the reservoir? Low temps can sometimes cause nutrient lockout problems. try to keep them between 70-78.

right, here are the pics.

haha sorry you responded quicker than i could reply with the pictures. (about 30 seconds after i posted) THANKS! interesting about the low temperature lockout. It does appear to be some kind of nutrient deficiency or ph problem with the leaf curling, but I have kept these conditions stable. I think you are right about the temperatures.

NewGrowth said:

I don't see any high quality pics . . . Are your clones fully rooted? How clean is the reservoir? Low temps can sometimes cause nutrient lockout problems. try to keep them between 70-78.

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Answer these and then tell me how much PPM flux you see between reservoir changes.

yes, clones are fully rooted and some even started growing upwards today. Been vegging them for a few days and seen no visible growth until today.

gvega187 said:

yes, clones are fully rooted and some even started growing upwards today. Been vegging them for a few days and seen no visible growth until today.

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How does the root zone look?

like i mentioned about 4 days of veg have passed. This is the first res./nute load the clones have seen, so yes the resevoir is clean and ppm's have been consistent at 500ppm

since plants have been vegging for only 3-4 days no root growth has begun to escape the pots. I assume the root zone is healthy as some plants are already starting rapid vertical growth. Plants with this problem (pictured) are not growing as vigorously.

What strain is this? It's a nutrient uptake problem, maybe they are just shock, likely root damage. Depends on how long your temps are getting into the 50's. Are you using h202? If not try adding some and see how they respond. Make sure you are not flooding during the drak cycle as well.

NewGrowth said:

What strain is this? It's a nutrient uptake problem, maybe they are just shock, likely root damage. Depends on how long your temps are getting into the 50's. Are you using h202? If not try adding some and see how they respond. Make sure you are not flooding during the drak cycle as well.

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these plants are currently still vegging so they flood all day. I am using somewhat organic nutes so I'm afraid to use h2o2. I use hygrozyme instead to keep the roots as clean as possible. Open space on the tray, not filled with containers are covered with mylar.

temperature problem seems the most probable error. This is a mix between WW, skunk #1 and northern lights. Apparently a 60/40 sativa indica. Would the sativa in her make it more susceptible to low temp stress?

any other theories? Thanks for the input newG

i'd try a bit of rhizotonic, stress reliever and boosts root production

...............what

canna rhizotonic buy some and try it

oh i gotcha. I hope one magical soup isnt my solution however. I checked the ph last night and it was actually 6.2 or 6.3. Somehow it went from 5.8 to 6.3 really quick...any ideas on that?

ripz, what other products produce similar results as the rhizotronic? I think there are tons of products with that same ingredient in it....just wondering. Thanks.

are you topping up your solution regularly cos obviously the more it drinks the higher the ph and ec will rise. have used lots of products over the years and found nothing that comes close to rhizotonic its da bomb

actually i don't add more normally. I used to do this and have had better results. What other reasons are there for toping off a res? aka I know it is a good thing, but why? other than trying to keep your ph/nutes right.

gvega187 said:

actually i don't add more normally. I used to do this and have had better results. What other reasons are there for toping off a res? aka I know it is a good thing, but why? other than trying to keep your ph/nutes right.

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what other reasons do you need m8? sounds like good enough reason to me idea is (depending on nutes ) to start off at around ph 5.5 and let it rise up slowly between res changes to 6.2-6.4, ec is dependant on how hungry the plant is. if you dont top up you will be hitting 6.0 on the ph after a coupla days

lol indeed this reason is a very major one. I was just wondering for my own knowledge what other benefits adding back fresh h2o helps.

Plants appear to be improving with the adjusted ph. Flushing soon and throwing them into 12/12. Thanks 2 Ripz and NEWg...i really want to try that rhizotonic. I always have at least minor root problems.