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 Dr. Penguin
Registered: 05/19/08
Posts: 1,036
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 Re: 1st timer help?  [Re: Dr. Penguin]
#129391 - 10/05/08 09:09 PM (16 years, 2 months ago) |
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I would give them a good flush with plain water to rinse out the excess salts from aggressive feeding, and give them plain water for the next two or three waterings. If the problem clears up then it was a nute burn, get some better ferts and feed every other, or every third watering. If the problem gets worse, then it is a micro nutrient deficiency (which I strongly doubt) in which case you will need to get better ferts and hope for the best.
One clear indicator of nute burn is a crispy texture of the leaves. How do the yellowing leaves feel?
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 first1peak
Registered: 10/05/08
Posts: 18
Last seen: 16 years, 2 months
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Re: 1st timer help? [Re: first1peak]
#129392 - 10/05/08 09:10 PM (16 years, 2 months ago) |
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thanks a bunch. im learning as i go here. Learning experiences!! :-)
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first1peak
Registered: 10/05/08
Posts: 18
Last seen: 16 years, 2 months
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Re: 1st timer help? [Re: first1peak]
#129393 - 10/05/08 09:12 PM (16 years, 2 months ago) |
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some of them are crisping up
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Dr. Penguin
Registered: 05/19/08
Posts: 1,036
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Re: 1st timer help? [Re: first1peak]
#129394 - 10/05/08 09:14 PM (16 years, 2 months ago) |
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Crisping is a definate sign of nute burn, be very careful of adding any more nutes of any sort untill you flush the excess out of the soil. Adding more nutrients at this point will only make the probem worse.
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Chronica
Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 14 years, 3 months
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Re: 1st timer help? [Re: Dr. Penguin]
#129396 - 10/05/08 09:21 PM (16 years, 2 months ago) |
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Quote:
Dr. Penguin said:
Crisping is a definate sign of nute burn, be very careful of adding any more nutes of any sort untill you flush the excess out of the soil. Adding more nutrients at this point will only make the probem worse.
Flushing is a good idea maybe. If he was using a 3-8-4 or something the yellowing would be normal on lower fan leaves and slowly work its way up. Mine crisp on the outside after they have been yellow for a little while.
http://images.google.com/images?q=Interveinal%20Chlorosis
It is possible he has a micro nute problem thats causing both the problems, chlorosis can be caused by micro nutes. The spots are probably micro nutes too. For some reason I dont think its over feeding. Id say wait for sirius or someone before you flush.
Edited by Chronica (10/05/08 09:35 PM)
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Dr. Penguin
Registered: 05/19/08
Posts: 1,036
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Re: 1st timer help? [Re: Dr. Penguin]
#129408 - 10/05/08 09:57 PM (16 years, 2 months ago) |
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MG is a chemical fert which is defiantly prone to overfeeding especially when used at every watering which is never a good idea. In my experience with other plants in soil, micro nutrient deficiencies in good potting soil are very rare, in hydro yes, but soil usually contains all the essential elements for growth. But I agree, you might want to wait for a third opinion fro Sirius or the like.
Check out this thread over at another board. Pay special attention to the sections about nute burn and the sections about micro nutrient deficiencies.
http://www.icmag.com/ic/showthread.php?t=11688
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Sirius
Saturn Ascends
Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 8 months
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Re: 1st timer help? (moved) [Re: first1peak]
#129441 - 10/06/08 04:42 AM (16 years, 2 months ago) |
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 This thread was moved from Marijuana Cultivation.
Reason:
Moving this to Doctor's Diagnosis as it is a thread seeking a diagnosis.
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Sirius
Saturn Ascends
Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 8 months
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Re: 1st timer help? (moved) [Re: Sirius]
#129443 - 10/06/08 05:08 AM (16 years, 2 months ago) |
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I really don't think it is nitrogen deficiency. I didn't see the pH of the soil mentioned anywhere - what is the pH of the water you're giving it, and what is the pH of the run-off. I think the pH is off, and it is causing a micro-nutrient lock-out. If not that, then the MG fertilizer (which definitely won't produce the best results with marijuana) isn't providing enough micro-nutrients in an accessible enough form for the plants.
I don't know too much about micro-nutrients to be able to say which one in particular it is, it kind of looks like calcium but it is hard to tell the color of what is happening with the HPS) as they usually just don't come up if you're working with stuff more intended for marijuana, but the best way to go about fixing it right now is to start flushing the soil with water that is adjusted to a good pH (closer to 6.3 or so for soil, from what I've read), and start using hydroponic-quality nutrients. Even if you are half-way through flowering, you'll need to get them for the next time too, and its still awhile before you'll stop feeding and only flush your plants (the plant on the left looks like it'll need around eight weeks of flowering time and the one on the right more like ten or eleven - interesting plants by the way!  ), and using the MG just isn't keeping a good chemistry.
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Sirius
Saturn Ascends
Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 8 months
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Re: 1st timer help? (moved) [Re: Sirius]
#129444 - 10/06/08 05:14 AM (16 years, 2 months ago) |
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On that note, I'd recommend trying out the Flora series, by General Hydroponics. It is the standard in indoor gardening, pretty inexpensive, gives you a lot of flexibility in fulfilling the different nutrient requirements of individual plants, as it is a three part series, and has well-documented information on dosages for growing marijuana.
Magash also has recommended Pure Blend Pro for its easiness for anyone to use with great results.
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first1peak
Registered: 10/05/08
Posts: 18
Last seen: 16 years, 2 months
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Re: 1st timer help? (moved) [Re: Sirius]
#129448 - 10/06/08 07:37 AM (16 years, 2 months ago) |
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Quote:
Sirius said:
On that note, I'd recommend trying out the Flora series, by General Hydroponics. It is the standard in indoor gardening, pretty inexpensive, gives you a lot of flexibility in fulfilling the different nutrient requirements of individual plants, as it is a three part series, and has well-documented information on dosages for growing marijuana.
Magash also has recommended Pure Blend Pro for its easiness for anyone to use with great results.
thanks. thats what i was looking for.
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Chronica
Registered: 04/20/08
Posts: 114
Loc: Canada
Last seen: 14 years, 3 months
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Re: 1st timer help? (moved) [Re: first1peak]
#129564 - 10/06/08 02:03 PM (16 years, 2 months ago) |
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Deficient in Iron, Mg, Nitrogen, Sulfur, or Imbalanced PH can all cause the Chlorosis or Interveinal yellowing.
Its possible to be mg heres what my book says on mg deficiency.
Quote:
No deficiency symptoms are visible during the first 3 to four weeks of flowering.
In the 4th to the 6th week of growth, the first signs of def appear. Interveinal yellowing and irregular rust brown spots appear on older and middle aged leafs. Younger leaves remain healthy. Leaf tips turn brown and curl upward as it progresses. Rust brown spots multiply, interveinal yellowing increases. Rust brown spots and yellow progress, starting at the bottom and advancing to the top of the plant. Younger leave develop rust colored spots and interveinal yellowing. The leaves dry and die in extreme cases.
Your plant that has the yellow looks to have interveinal yellowing to me.
Edited by Chronica (10/06/08 02:09 PM)
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lukeduke711
Registered: 07/06/08
Posts: 123
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Re: 1st timer help? [Re: Chronica]
#129572 - 10/06/08 02:15 PM (16 years, 2 months ago) |
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i always have stuff like this happen to plants....what you need to do (only if using nutrients) is water it with strait water for a week to "detox" the plant if you know what I mean, and ill bet you itll green up quite a bit
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