Help! Seedling nutritional deficiency

Discussion in 'Hydroponics / Aeroponics' started by rollmyegg, Jul 31, 2018.


    rollmyegg New Member

    Hey growers, this is my first topic and also my first grow.

    I will start with the basic info.

    I'm growing a "Sweet Mango Auto" in a hydroponic system. The Seedling is now 14 days old.
    It's just one plant, I decided to start slow. The nutrient mix is a Atami B'cuzz A and B Hydro all in one mix.
    I read about it, and what I understood, is that this mix has actually all nutrition's you need from grow to harvest. I also bought a bottle of calmag. I prepared a solution with 1ml of the solution per 1l distilled water and also adjusted the Ph to a 5.5-6. PPM was around 600., now 300. The temperature is between 28-30 Celsius ( 82.40℉ to 86 F) . I know its a bit too high, but the plant never had issues with it until yet.
    Two T8 growing lights with enough lumen and with full spectrum. Enough for the first 2-3 weeks until i put it on the balcony.
    I don't use a water or oxygen pump in the humidtydome. The plant sits on a rockwool cube 1 inch deep in the nutrient solution. Do I need to add some extra calcium or is calcium oxide enough?

    Now to the problem:

    Since 3 days , the leaves have a slight pale green color on the outside the leaves, from the halfway from the middle to the border. I was concerned and start to read a bit, and assumed that may a lack of potassium would be responsible. I mixed a new solution, because i assumed I made a mistake with the first one and created some nutrient lockup. Because in the B'cuzz hydro is already potassium oxide (K2O) included I didn't bothered to buy normal potassium. I hope it's the same. Please advise me if I'm wrong at this. Nothing changed, so I start to dig deeper, and found a interesting article that it could be overfeeding. it makes sense because my leaves start to curl weird as well. So I flushed the nutrition solution and put normal tap water for 24 hours to give it a rest and flush out the stuff. Today I woke up and got those yellow dead spots on the leaves. Now I'm on a point where I need expert help.

    Thank you all. F.

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    JSB99 Well-Known Member

    Lots of issues going on here.

    This is constructive criticism, so don't take it as me saying "you don't know what the hell you're doing and you need to go back to your day job" LOL :)

    Myself, and others, usually recommend noobs start off with soil for their first grow or two, just to learn how to go from "seed to smoke". This is especially the case for those not highly technical. So, the quickest advice I can give you is to go to Walmart and get a fabric "root bag", some middle of the road potting soil (stay far away from Miricle Grow), and grow your little one in dirt this time. The nutrients you have will work for soil as well as hydro.

    Issues with your current grow:
    • 300ppm, much less, 600ppm, is too high for a start that small. You should be in the 200ppm range. If you stay with dwc, dump your current "soup" (nutrient-rich water), and use straight water for a couple days. Then, introduce a little solution (around 200ppm) and increase it up to 300ppm over a week.
    • I wouldn't use a 1-part nutrient solution for growing weed. I highly recommend using General Hydroponics nutrients, specifically "MaxiGro", and "MaxiBloom", both of which are cheap on Amazon and other places.
    • Do not use the nutrient feed chart on the back of whatever nutrient you decide to go with. This is usually way too high for growing weed, and each plant has different needs that can't be determined at the lab. Instead, look up the nutrient charts specifically for growing cannabis in either soil or hydro (both of which have different requirements). If no online feedchart is available, rule of thumb is half-strength of what the feedchart on the label suggests.
    • In general, you absolutely need an air pump with dwc. Roots need oxygen, and if they are just sitting in the water, your plant will drown. An air pump and air stone will inject dissolved oxygen into the water, that the roots can then use to breath.
    • I can't tell what kind of container you're using, but it doesn't look familiar from the picture. A starter dwc usually consists of a 5-gallon bucket, a small air pump and stone, and a netpot sitting in a cut out hole in the lid. Lots of vids on YouTube for building very inexpensive"dwc bubbling buckets".
    • If you're going to put the plant outside, you'd be better off just doing soil for the whole grow. Absolutely do not bring your plant back in the house after putting her outside. That's a sure way to get really nasty bugs in your grow room, if you're growing inside as well as out.
    • Temps are a little high, but still in range. But you need to get a small fan moving the air around your plant to help keep it cool through perspiration. The breeze moving your plant around also helps build up strength in the stalk. But you don't want too much air blowing directly on your plant because it can cause wind burn.
    • You want to add CalMag to RO water, but if going to soil, you won't need it.
    • Once you get your plant on the right track, you'll want to look at the new growth to determine how your plant's doing. Damaged leaves will not repair themselves, so don't worry when they don't start looking healthy and new. Again, new growth is what you want to look at. It'll be a little light until the leaves grow larger, then they'll turn darker.
    Whatever you do, don't add a whole bunch of chemicals to try and fix the problem. That generally makes things worse.

    GrowWeedEasy is a great site to learn a ton about growing. I highly suggest you do lots of research there.

    Good luck :)
    Last edited: Jul 31, 2018
    rkymtnman likes this.

    rkymtnman Well-Known Member

    exactly what i was thinking. good advice.
    JSB99 likes this.

    JSB99 Well-Known Member

    It's just an accumulation of information I've gathered here :) I'm like a weed encyclopedia LOL!
    Logan Burke and rkymtnman like this.
    Logan Burke

    Logan Burke Well-Known Member

    I shot straight to the bottom to reply when I saw 1ml calmag/1l of water....that's a high, high dose of cal-mag, I don't feed my full grown plants that much cal-mag lol....and not very many nutrients have a single formula for both veggy and flower that is effective, but rather, one bottle for veg and a different bottle for bloom, maybe that's what you meant. I know I went from two soil grows to DWC, but with that being said, my first DWC was an unmitigated disaster lol. I believe that you can do it, and with one already started I'd try it, but I'd grow one in soil along side it as a back up so you aren't relying on that for all of your medicine.
    Also, I've always believed that it's best not to add something such as cal-mag unless/until you see a deficiency symptom that you think it could be of use for...try using it more as a reactionary measure verses a proactive measure..with the proper planning and people's help like JSB and RkyMtnMan, you'll be just fine for whichever kind of grow you decide to do!
    DonTesla likes this.

    JSB99 Well-Known Member

    Normally it's 5mil/gallon, so 1mil/litre should be okay.

    I've never used RO, but from what I understand, it needs CalMag because those minerals have been filtered out. CalMag is also used wen growing via Coco coir. But yeah, other than that, don't add it unless there are signs of deficiency.

    And, I'm glad to help. Hogging knowledge never helped anyone :)
    Logan Burke likes this.

    UncleAlex0425 Member

    First time grower as well I did a lot of research so if you take the time it’ll show in your grow happy growing

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    TIMtoKILL Active Member

    That’s where you should start.

    Also I would recommend getting a regular feminized seed. Autos have always been finicky with me.

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