Dwc turning yellow help plz

Discussion in 'Marijuana Plant Problems' started by Blacks0113, May 14, 2018.

  1.  
    Blacks0113

    Blacks0113 Member

    Hi there im growing some chunk in dwc and was wondering what could it be turning my bottom leaves to droop and yellow pics addedhelp plz
     

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    OldMedUser likes this.
  2.  
    friedguy

    friedguy Well-Known Member

    Looks like nute burn to me. Are those green leaves real dark green (can't tell with the color from your lights)? What are you feeding her?
     
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  3.  
    NrthrnMichigan

    NrthrnMichigan Well-Known Member

    I don't see any yellowing...I see purple ish.. Try to post a pic in regular lighting. In dwc drooping can be associated with lack of oxygen. But realy hard to tell from those pics. After further review...that first pic looks like those bottom leafs are fried.. What is your ec or ppm's? PH? Temp of water, temp and RH of air?
     
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  4.  
    Blacks0113

    Blacks0113 Member

    Heres some clearer pics and im adding 0.75 micro and grow to every ltr and theres 11ltrs in there and also 11ml calmag 50ml rootgrow
     

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  5.  
    NrthrnMichigan

    NrthrnMichigan Well-Known Member

    Do you have any meters? PH pen? EC or PPM pens? Looks like you are frying them. How about a pic of the roots? If you have barely any roots I wouldnt be over 500 ppm's. Just curious...are you using RO water? Why the calmag?
     
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  6.  
    Blacks0113

    Blacks0113 Member

    My ppms come to 300 - 330, ph is 6.3, water temp is 20 - 21c, rh 60 and temp 27-30 day night 23
     
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  7.  
    Blacks0113

    Blacks0113 Member

    Im new to growing and i literally dobt know just in need of severe help oh and using normal tap water which comes to ph 7.8
     
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  8.  
    NrthrnMichigan

    NrthrnMichigan Well-Known Member

    300 @ 700 scale?
     
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  9.  
    NrthrnMichigan

    NrthrnMichigan Well-Known Member

    I would discontinue use of calmag. Try to get your ph to the sweet spot of 6.1, 6.3 is acceptable. You ambient room temp is pretty high I would bring that down to 24 - 25 which in turn will help you keep your rez temps lower than 20.
     
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  10.  
    Blacks0113

    Blacks0113 Member

    The plant is in its third week should be the fourth this saturday so what do you think? Shall i just give 8ml micro and grow and leave the calmag and root grow out?
     
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  11.  
    OldMedUser

    OldMedUser Well-Known Member

    How long ago did you put it in DWC? Has it got roots in the water?

    Water temp isn't bad but lower would be better. Are you using any peroxide or have some beneficial bacteria stuff. I just used peroxide until I made a chiller then keep the nutes at about 17C/65F. Never used bennies.

    Probably didn't need any CalMag with tap water so don't add more. I never used any root stuff either and always got lots of roots just with base nutes in RO water. I don't know what's in your tap water tho. Do you?

    :peace:
     
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  12.  
    Blacks0113

    Blacks0113 Member

    I started the dwc 3 weeks ago put the rockwool straight in 1 week after it sprouted, my tap water is hard which comes to about a p. H 7.8, so i have to ph it down im using general hydroponics micro grow and bloom i was told to lower my ec to 1.2 which i have done but still abit confused
     
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  13.  
    OldMedUser

    OldMedUser Well-Known Member

    What's the EC of your tap water? I use ppm on the 500 scale so 1.2 EC = 600ppm to me. Not that high but you need to subtract the EC of your tap water from the total to know how much of it is actual nute EC.

    You should also keep track of how much water you add back to your system and once you've added back as much as the system holds it's time for a nute change. By then the EC from your tap water is double what it is straight out of the tap.

    I only use RO water and can go a whole grow without once changing nutes but that's not for the new guys. :)

    You should contact your water supplier and request a copy of their water analysis report and it's likely they will email you one for free. They're supposed to as it's public info. Might even have it posted on a town website.

    PPM-EC-CF.jpg

    I found a great spot to download FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.

    :peace:
     
  14.  
    Blacks0113

    Blacks0113 Member

    I checked the ph, ppm and ec of my tap water there as follows. Ppm 235, ec 0.4 and ph 7.6. But i dont really k ow how to measure my nutes given to plants
     
  15.  
    OldMedUser

    OldMedUser Well-Known Member

    For plants the size of yours your nutrient ppm should be around 300 - 400 so with your water being 235 you want around 500 - 600 total once you've mixed your nutes into the water.

    The pics of your plants look like nute burn but shouldn't be burning at the lower feed levels you are running. As the newer leaves look fine I think it's just an unbalanced system so far.

    What are the roots like? Are they growing out of the net pots yet into the nutrients? Even if they are not yet in the water they should be getting wetted all the time from popping bubbles in the pail. If not showing then I'd top feed with a turkey baster using nutes from the pail they are in. Cut a hole in the lid if you have to so you can get stuff in and out easier.

    I notice that the holes for those net pots go all the way up to the rim and could be letting light into the pail maybe accounting for yellowing from some sort of algae growth. I use regular net pots that have a band of solid plastic for the first couple inches at the top.

    Your nutes should be about he same strength as my AN 3-part ones and I tested just recently to find that 1ml/L of each gives me almost dead on 300ppm of nutes which is right about where you want to start young plants/clones.

    The tops look good so once things are evened out they should start showing better growth.

    :peace:
     
  16.  
    Blacks0113

    Blacks0113 Member

    Should i add more pebbles to not allow light in? Plus with the nutrients added and the little take out of nutes which consisted of taking 4ltrs nutes out and replacing it with water which i then ph'd bought the ec down from 1.9 to 1.2 and my ppms are coming to 535 is that okay? The roots havent come out yet the pot is big but yeah no sign and its in its 3rd week.
     
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  17.  
    OldMedUser

    OldMedUser Well-Known Member

    The ppm sounds good. Are you top-feeding the plant until roots emerge? They usually come out within a few days for me but I use larger clones most times.

    Just need to top-feed once or twice a day until they show roots then they're fine.

    :peace:
     
  18.  
    Blacks0113

    Blacks0113 Member

    Whats top feeding it?
    And its in its 3rd week but still no sign of roots, i was told to spray the plants with npk raw salubles kelp.
     
    Last edited: May 17, 2018
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  19.  
    OldMedUser

    OldMedUser Well-Known Member

    Top feeding is when you suck up some nutes from the pail and squirt them around the base of your little plant to feed it until the roots emerge from the net pot.

    I think I'm seeing the root of your problem now. No roots! And no food for the sprout. Amazed it's still alive at all.

    I have a 60cc syringe with some tubing on the end for sucking up samples for testing or top-feeding new clones. A good old turkey baster works well for that too and is easier to get cheap at most stores that sell kitchen stuff.

    Shouldn't spray anything on your plants if you don't have to. It's most likely that's what causes those lower leaves to brown like they did at the ends. All makes sense now.

    And add some more balls to block the light better too if you can see into the pail thru those slits in the pot.

    :peace:
     
  20.  
    OldMedUser

    OldMedUser Well-Known Member

    Oh yeah. Here's some free reading material for ya.

    I found a great spot to download FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.
     

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