@Stumpy1 posted a new topic, subject "Light burn or nutrient issue 🤔". It read:

   Howdy folks, started second grow, following the nutrient amounts to the T , noticed the leaves had markings just now that were not there this morning . I raised the light a few inches . Need some advice . Just started week 3 however have not yet added the resin . 
    
    image2436×1125 425 KB
    
    image1512×2016 1.6 MB
    
    image1125×2436 564 KB

So @PharmerBob replied

    What's your input? What's your output? What nutes are you adding and when? Got a log? What medium is that? How long have they been in it? Was it hot to begin with?
    
    From looking at it your input is off and your killing your plant slowly. Now how can we fix this issue? Add input
    
    Judging by serrations of leaf edge this has been going on for a while

So @Stumpy1 replied

    image1512×2016 1010 KB

After which, @Stumpy1 added

    In perlite, watering every second day . 14 days since germination

After which, @Stumpy1 added

    EC and PH is always spot on

After which, @Stumpy1 added

    image1125×2436 705 KB
    
    this photo taken two days ago, not hot , been averaging 24 degrees inside the tent . Light is 20/4

@Stumpy1 replied

    image1125×2436 400 KB

Then @Stumpy1 said

    image1512×2016 1.58 MB

So @PharmerBob replied

    Ec and ph are spot on what?

To which @PharmerBob replied

    Nitrogen seems low in that nutrient line up as well
    
    Might as well fill out a support ticket
    
    Your not supplementing cal/mag?

To which @Stumpy1 replied

    When I mix the nutrients and water , water temp is always around 20 degrees

@PharmerBob replied

    Well done it's thoroughly mixed. You need to know the parts per million/ total dissolved salts/ electrical conductivity of the actual input
    
    Along with the ph before you add to your soil
    
    If your not within parameters for your substrate you will take the ability for the plant to intake that nutrient

So @Stumpy1 replied

    Was going to start adding cal mag next water , noticed the leaves had changed hence the questions . Only second grow and learning as I go , am not an expert . 
    
    image1512×2016 1.02 MB

@PharmerBob replied

    Cal mag is an every watering thing. Some nutrient lines give small portions that will get you past seedling stage but not enough for a growing / full size plant

To which @PharmerBob replied

    Cal/mag won't cause the yellow leaf tho, it will create brown spots, you still gotta figure out what's causing the yellowing
    
    I'd say your nutrient line isn't strong enough to support this type of plant, or it's too weak of an input for it.
    
    Ph and ppm/tds testers would be beneficial

Then @Stumpy1 said

    Ok thanks, I'll add it every water , do you think I should maintain the current nutrient levels according to the manual or back off a bit . My hydro guy is an hour drive away, I'll go and see him tomorrow. Was just hoping for input from regular growers. Thanks for your help

Then @PharmerBob said

    No one can tell you to add or back off without knowing the correct information of what your actually adding

After which, @Stumpy1 added

    Ok, thanks for your help

So @CMichGrower replied

    Stumpy1:
    
    > In perlite, watering every second day
    
    Perlite and what else…

Then @pillsbury said

    hydro guy is an hour drive away, I'll go and see him  
    Can Hydro guy come see you? Hands on with your plants would be best. Also dump the water/ph probe they don't give very acccurate readings.

So @Stumpy1 replied

    image1512×2016 988 KB

To which @Stumpy1 replied

    Coco with 30% perlite… I did mention I'm only new at this .

@Stumpy1 replied

    When lights come back on I am to test ph and ec on runoff. Thinks it could be ph fluctuation or needing more nutes, may need a flush for a day ,See what the numbers are at lights on

Then @Stumpy1 said

    Intake ph was 6.2, output /overflow was 6.8, ec was 1.92 and on overflow 1.30 , ph to high for the cal/mag to be picked up I believe. Will drop the ph on tomorrow's water to 6 and keep an eye on it . Thanks for all the feedback , lots to learn . 
    
    image1512×2016 1.68 MB

To which @PharmerBob replied

    5.5-6 with coco

After which, @Stumpy1 added

    Thanks heaps

After which, @Mark0427 added

    Yes could be that the medium has too high of a ph. Coc is best around a 5.8. Try and get it down to a 5.8 area and it will prolly start to kick in gear. If u can since u chose coco. Which coco? And jacks 321 nutrients are fairly cheap go along way and u can do grows start to finish with just jacks and nothing else. Knowing if u have a buffered coco to start will help alot. Canna coco comes buffered ready to go. Other cocos might require to be washed and buffered to they correct ph before planting. Cocoloco was a bad coco for me to stary with even buffering it it was still a huge mess and almost killed the plant.

So @Stumpy1 replied

    Thanks mate, when I feed today I'll drop it down again. Is it safe to straight to 5.8 or could I shock it

To which @primus replied

    I hope that's a typo. 24 degrees is way too cold. Unless you talking Celsius.

After which, @primus added

    Don't do large swings. Unless its absolutely necessary or else she will start acting like blonde and not do anything you want her to

Then @primus said

    As for nutes and plant symptoms I can't help with that. I use Nectar for The Gods line. Completely different. Had to relearn everything.

To which @Stumpy1 replied

    Celsius mate, live in Australia

After which, @Stumpy1 added

    Thanks heaps

To which @Mark0427 replied

    If u have ur sol  
    Il ph coming out high drop it in the nute mix to a 5.0 and water with that a bit see if it brings the ph down. Just do phd water. Once the ph is in check leave it dry out good for a few days then drop some good phd nute water on her. If i try and flush it woth phd w a ter if say 7 gal id go with atleast 4 or 5 gallons of phd wayer and slowly put the water to the diry so everythong gets wet alowly and works its way down the dirt and out. If u do too fast the water will find tunnels it will make and basically yravel thru the tunnels and not get all out. Slow is key after ph is in check mix nutes and ph to 5.6 to 5.8 and water awau. Good lick

After which, @Stumpy1 added

    Thanks so much

Then @Stumpy1 said

    Ph sorted, had a good week, have bounced back and they look very happy , apreciate everyone's input 
    
    image1512×2016 1.8 MB
    
    image1512×2016 1.35 MB

To which @PharmerBob replied

    Glad to see them thriving! Well done! Now you can really see what they can do! Grow on my friend!
    
    They filled that space out quickly

Then @Stumpy1 said

    Thanks heaps, I can't believe how quick they are growing. We have had a week of rain and outside temps have been pretty low . Let's hope it stays this way .

Then @PharmerBob said

    They will take off from here on out just keep it dialed in

To which @Stumpy1 replied

    I hope so…

Then @Stumpy1 said

    image1125×2436 623 KB
    
    image1125×2436 635 KB

@Stumpy1 replied

    image1512×2016 749 KB
    
    image2436×1125 510 KB


{'source': 'discourse', 'url': 'https://support.ilovegrowingmarijuana.com/t/light-burn-or-nutrient-issue/64261', 'title': 'Light burn or nutrient issue 🤔', 'views': 336, 'has_accepted_answer': False, 'word_count': 1176, 'like_count': 18, 'reply_count': 30, 'participant_count': 6, 'posts': 42, 'tags': '', 'author': '@Stumpy1', 'participants': '@Stumpy1, @PharmerBob, @CMichGrower, @pillsbury, @Mark0427, @primus', 'image_url': ['https://global.discourse-cdn.com/growingmarijuana/optimized/4X/4/1/1/4111488c7da817c4c08d0a6f98d4bf2b1e54838a_2_1024x472.jpeg'], 'created_at': '2021-03-16T10:14:11.586Z', 'last_posted_at': '2021-04-30T12:31:07.527Z'}