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OfflineChronica


Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 6 years, 2 months
Black Spots
    #83233 - 07/14/08 08:28 PM (8 years, 4 months ago)

Im not sure what this is, something has turned the very tip of the leaf black. and at the tip of the leaf, not so much towards the center of the leaf but more on all of the leaf blades's  outer tips, they have black dots that look pretty similar to the calcium deficiency, but do not have any yellowing on the leaves, nor are the dots brown they are black and can be seen easier on the bottom side of the leaf than the top. Im wondering if this is a early calcium deficiency? This is happening on my bigger fan leaves.


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Offlinem3kgt
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Registered: 04/29/08
Posts: 1,008
Loc: G-Spot TX
Last seen: 1 year, 10 months
Re: Black Spots [Re: Chronica]
    #83250 - 07/14/08 09:06 PM (8 years, 4 months ago)

Well since you've already posted about purple stems then I would put the two together and say that you have a Phosphorus(P) deficiency. What is your soil or hydro pH? What is your current nutrient solution consist of?


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OfflineChronica


Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 6 years, 2 months
Re: Black Spots [Re: m3kgt]
    #83368 - 07/14/08 11:47 PM (8 years, 4 months ago)

The purple stems is on her clone. The Black dots is on the mother.

Only using MG ferts hopefully getting guano soon.

Soilless Mixture for the soil.

No PH Tester ATM.


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Invisiblecoda


Registered: 04/20/08
Posts: 4,734
Trusted Cultivator
Re: Black Spots [Re: Chronica]
    #83902 - 07/15/08 10:33 AM (8 years, 4 months ago)

knowing how strong MG ferts are, i'd say there's a good chance you're overfeeding your plants.

Why people use that crap is beyond me, i know to some it's a quick fix, but it seems like MG products cause more harm then good.  I just visited a buddies house the other night and witnessed what the MGMC soil can do.  All of his plants are suffering from a severe N def. right now and are literally dying on the vine.


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MFDoom666: sobriety kills my buzz every time.


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OfflineChronica


Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 6 years, 2 months
Re: Black Spots [Re: coda]
    #83958 - 07/15/08 12:21 PM (8 years, 4 months ago)

Quote:

coda said:
knowing how strong MG ferts are, i'd say there's a good chance you're overfeeding your plants.

Why people use that crap is beyond me, i know to some it's a quick fix, but it seems like MG products cause more harm then good.  I just visited a buddies house the other night and witnessed what the MGMC soil can do.  All of his plants are suffering from a severe N def. right now and are literally dying on the vine.




Its starting to look more like a calcium def. I have done a pretty good job with these nutes, have had a few deficiencies and fixed them. Im getting some guano soon and hope that those produce good results, havent really gotten to see any grows or much comments on it. And also some calcium/mg supplement and a ph kit.




Whats happening to the leaves looks just like this only the spots are black. The spots are starting to lighten up in the centers of them. So im thinking this is probably the problem. Calcium def.


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Invisiblecoda


Registered: 04/20/08
Posts: 4,734
Trusted Cultivator
Re: Black Spots [Re: Chronica]
    #85410 - 07/16/08 07:43 PM (8 years, 4 months ago)

ok, if it's a Ca def, look to the reason for the def. before adding in cal mag.  If your PH is off and is locking out the nutes, feeding it more won't do anything for you.


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MFDoom666: sobriety kills my buzz every time.


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OfflineChronica


Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 6 years, 2 months
Re: Black Spots [Re: coda]
    #85479 - 07/16/08 09:05 PM (8 years, 4 months ago)

Quote:

coda said:
ok, if it's a Ca def, look to the reason for the def. before adding in cal mag.  If your PH is off and is locking out the nutes, feeding it more won't do anything for you.




Good info. Im getting a ph kit with the magical. :thumbup:


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OfflineChronica


Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 6 years, 2 months
Re: Black Spots [Re: coda]
    #98248 - 07/30/08 08:29 PM (8 years, 4 months ago)

What should my ideal ph be with 1/3 peat, 1/3 perlite, 1/3 verm?


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OfflineSirius
Saturn Ascends


Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 7 months, 20 days
Trusted Cultivator
Re: Black Spots [Re: Chronica]
    #98949 - 07/31/08 07:40 AM (8 years, 4 months ago)

I'd assume that the basic hydroponic range for pH would apply, considering that you're working with an inert medium (the same range applies with coco, so it would seem likely). Here's a cool chart on different pH levels and the ranges at which different nutrients are not locked-out. It should help decide which range to experiment with, keeping in mind that different plants will perform optimally with different levels.



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Cannabis, Marijuana, Ganja & Greens >> Cannabis Cultivation

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