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Is this a nitrogen or magnesium deficiency?

Discussion in 'Marijuana Plant Problems' started by caca24, Jun 7, 2017.


    im4satori Well-Known Member

    ya even a 1/4 dose that's still 2.5 to 3 mls per gallon

    anything over 1.5 would be too much N

    at 2.5 mls per gallon the N is super high, the P is fine and the K is low

    if you convert the % amounts its

    189ppm N (way to high almost double)
    40ppm P (fine)
    77 ppm K (low)

    so theres no doubt you've over fed the N with that dose

    caca24 Member

    This would account for the claw and the burned tips.

    Is your opinion that I am having a nitrogen overdose and magnesium deficit?

    With the yellowing top leaves now it looks like an iron deficit too. :(

    From what I read, plant stress can display things similar to nutriment deficiencies.

    If we go back to my first post, I had not given anything to the plant except water but I was still experiencing yellow lower leaves. Is it probable that via a single dose, I pushed it from nitrogen deficiency to nitrogen overdose? How does the magnesium come into play here?

    im4satori Well-Known Member


    im4satori Well-Known Member

    your lower leaves where yellowing and the plant was asking for some food

    possibly several things if you hadn't fertilized

    then you jambed a bunch of N down her throat and she got sick from too much and the leaves curled down

    who knows you could also be lacking iron

    without a properly balanced fertilizer your not going to get passed your issues

    whats the iron % in the fertilizer you have/used?

    post a recent pic

    caca24 Member

    I think it looks slightly better than just before I watered it.

    Here it is:


    Fertilizer details
    Guaranteed Minimum Analysis

    Total Nitrogen (N) 28%
    Nitrate Nitrogen 1.7%
    Ammoniacal Nitrogen 0.3%
    Urea Nitrogen 26%
    Available Phosphoric Acid (P2O5) 14%
    Soluble Phosphorus 6.1%
    Soluble Potash (K2O) 14%
    Soluble Potassium 11.6%
    Calcium (Ca) 0%
    Magnesium (Mg) 0%
    Chelated Iron (actual) (Fe) 0.100%
    Chelated Manganese (actual) (Mn) 0.050%
    Chelated Zinc (actual) (Zn) 0.050%
    Chelated Copper (actual) (Cu) 0.050%
    Boron (actual) (B) 0.020%
    Molybdenum (actual) (Mo) 0.0005%
    EDTA (chelating agent) 1.24%

    im4satori Well-Known Member

    ya man.. I think its time to feed her again but

    that plants in bloom you don't want to use that fertilizer during bloom

    the iron is also very low

    theres no magnesium and no calcium whats so ever... it doesn't even have sulfur so its incomplete
    honestly it looks like something youd use on a lawn, along with some lime

    the plant does look better... its still showing magnesium def
    spray her with 1/4 tsp Epsom salt per gallon and again in 3 days...

    you need a proper fertilizer or something we can stack on top of this one that has high K and a good amount of the micro nutes like iron

    see whats available to you, take pics of the labels that shows the % amounts and what its derived from but don't buy it and post the pics so we can get you square before you buy
    Johnei likes this.

    caca24 Member

    Since i am in the great white north, my selection of fertilizers is limited. Everything I have seen in the big box stores is either miracle gro or scotts turf fertilizer. I will go to the plant store this weekend to see if I can score something better.

    Anyone got recommendations on something I could order online?

    im4satori Well-Known Member

    the general hydropic flora grow and flora nova is super easy and works well and its complete 8mls of one or the other per gallon full strength

    theres plenty of options

    maxi grow and maxi bloom 50/50 2 grams each for bloom full strength or 4 grams grow for veg

    these are both easy to use and complete and balanced

    caca24 Member

    I bought some flora grow as it was the only readily available one that I could order. I should get it in a couple of days.

    I should go 50% strength on the first feeding right?

    im4satori Well-Known Member

    id give it
    6mls per gallon
    1/8 tsp Epsom (0.5 grams) per gallon
    3mls cal mag per gallon

    caca24 Member

    Looks like she pulled threw! Thanks!

    Now I have an issue with height because I did not expect it to grow this tall. This is why I have some lightburn and funky looking leafs on top. Also, why there are a couple 90 degrees bends in the stems.

    Any ideas when she will be ready?

    IMG_20170706_210605372.jpg IMG_20170706_210624447.jpg

    im4satori Well-Known Member

    theres no way for me to know that

    but most take 8 to 12 weeks of 12/12

    with 9 to 10 weeks being most common

    im4satori Well-Known Member

    if your very careful

    you can start at the base of the stalk and tie a loose loop

    then wrap the string (carefully) around the stalk while moving upward
    until you get a few inches from the top

    carefully guiding string to not mess up the leaves or branches or in the bud sites

    then take the string from the top and bend it down ...bending the top over...
    but its a real risk if you end up breaking the stalk that would suck bad

    maybe a safe option is to use some bamboo stakes and try and guide the top over and tie it to the stake to get it out from under the bulb directly

    caca24 Member


    I was able to bend the main cola so that it fit under the light without being directly pressed against it.

    After a dry, I was able to collect a good 47 grams out of that plant and I am currently curing it.

    Unfortunately, the main cola got a bit of bud rot because it was not suspended while drying. I am making some tincture out of that.
    im4satori likes this.

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