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 iDl
undecided
Registered: 03/13/10
Posts: 35
Last seen: 12 years, 1 month
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 spots and blotches on leaves 
#453301 - 07/30/10 08:37 PM (14 years, 3 months ago) |
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i'm on week 3 of flowering. about 10% of the leaves on multiple plants are showing signs. the plants all veg with no issues. the medium is CocoNot/perlite. nutrient is botanicare pro bloom/liquid karma with a powdered guano supplement to up the phosphorous. ph is mantained between 5.5 and 6. i know there are cec issues with coconot.
what do you guys think?
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GnarlyGoods
Stranger
Registered: 03/29/10
Posts: 49
Last seen: 14 years, 3 months
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 Re: spots and blotches on leaves [Re: iDl]
#453590 - 07/31/10 03:03 PM (14 years, 3 months ago) |
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looks like the same problem i had, it could be because the ph is too low, but im not completely sure. it wouldnt hurt to raise the ph a wee bit
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geokills
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Registered: 05/08/01
Posts: 1,287
Loc: city of angels
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 Re: spots and blotches on leaves [Re: iDl]
#453997 - 08/01/10 03:42 PM (14 years, 3 months ago) |
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I would suggest lightening up on your nutrient solution. This should also help bring your pH up a bit, since all the nutrient solutions I've come across are fairly acidic.
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 coda
Registered: 04/20/08
Posts: 4,736
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Re: spots and blotches on leaves [Re: geokills]
#454022 - 08/01/10 04:22 PM (14 years, 3 months ago) |
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Are the stems on those leaves purple or red?
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MFDoom666: sobriety kills my buzz every time.
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rakipo
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Registered: 06/20/10
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Last seen: 14 years, 2 months
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Re: spots and blotches on leaves [Re: coda]
#458633 - 08/12/10 12:21 AM (14 years, 3 months ago) |
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You have a phosphorus deficiency. Since you have been using a nutrient supplement that has a good level of phosphorus that might mean you have excess amounts of iron and zinc. Excess amounts of iron and zinc lock up your phosphates. Acidic soil aggravates the phosphorus deficiency even more, so keep it within the 6.0-7.0 range. Sucks that I couldnt get to this thread earlier but you need to flush your soil.
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kln
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Registered: 12/08/09
Posts: 134
Last seen: 8 years, 6 months
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Re: spots and blotches on leaves [Re: rakipo]
#460983 - 08/15/10 08:08 PM (14 years, 3 months ago) |
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Quote:
rakipo said:
You have a phosphorus deficiency. Since you have been using a nutrient supplement that has a good level of phosphorus that might mean you have excess amounts of iron and zinc. Excess amounts of iron and zinc lock up your phosphates. Acidic soil aggravates the phosphorus deficiency even more, so keep it within the 6.0-7.0 range. Sucks that I couldnt get to this thread earlier but you need to flush your soil.
I agree that he should flush the medium asap
But, he is using coco/perlite mix so he should go for a ph of 5.8 like mentioned above he is keeping between 5.5-6.0
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iDl
undecided
Registered: 03/13/10
Posts: 35
Last seen: 12 years, 1 month
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Re: spots and blotches on leaves [Re: kln]
#461123 - 08/15/10 10:49 PM (14 years, 3 months ago) |
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hey guys, thanks for the advice. ive been testing the runoff over the last two weeks and initially the plants showing the worst problems had the lowest ph runoff. starting with water at 6.0 ph the runoff came out as low as 4.3 in the extreme case. the plants showing no problems had a runoff of around 5.5-6. i am working with multiple strains. some showing no issues and others obviously having problems. the purples having the most problems.
i've been flushing them with a light nutrient solution + calmag until the runoff is around 6.0. (they were getting no calmag supplement before). the runoff at this point is fairly stable around 5.8-6.1 with all the plants. most of the plants greened up nicely but still show some rusty spots and minor yellowing. one plant is still getting worse. i dont have pictures today, i might tomorrow.
I should also mention they are in 3gallon pots being hand watered/fed every other day sometimes every day if i am available. they are not on any kind of automated feeding system. they are now on week 5.
Thanks again for the interest, i'll try to keep you guys updated more often.
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kln
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Registered: 12/08/09
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Last seen: 8 years, 6 months
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Re: spots and blotches on leaves [Re: iDl]
#462788 - 08/18/10 09:20 AM (14 years, 3 months ago) |
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I'm curious to see their progress!
coco/perlite handwatered is how i'm working right now.
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