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 WildBud420
Stranger
Registered: 09/21/13
Posts: 138
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 leaf issue 
#696281 - 12/01/13 12:22 PM (11 years, 26 days ago) |
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1. Are you growing from seed or clones?-Clones
2. How old are your plants?-approx 3 weeks
3. How tall are your plants?-9-12 inches
4. What type of hydro system are you using?-Aeroculture
5. What brand/type of nutrients are you using?-AN Micro/grow/bloom
6. What is the Ph of your nutrient solution?-5.7
7. What is the PPM/EC of your tap water?-approx 140
8. What is the PPM/EC of your nutrient solution? currently approx 500
9. What is the temperature of your nutrient solution?-22c
10. Does your PPM/EC show a rise or fall when you do your daily PPM check?- has remained stable(maybe +/- 10ppm)
11. Does your pH show a rise or fall when you do your daily check?-tends to rise about 2 points over a week.
12. Do you foliar feed or spray your plants with anything?-No
13. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")-1000w MH for veg, 1000w HPS for flower, currently HPS
14. How close are your lights to the plants?-20 inches
15. What size is your grow space in square feet?-4.5x9x7 tent
16. What is the temperature and humidity in your grow space?-ambient 25c, under light 27.5c
17. Have you noticed any insect activity in your grow space?-No
18. How much experience do you have growing?approx 20yrs on and off.
I am having a small leaf issue, Some white tips, which i have found common when using the tap water here. More importantly is the dark spots/necrosis? on the leaf tips. After doing some searching i've come up with 2 possible problems, Magnesium and zinc. But i need help narrowing it down and what to treat it with. Any help would be great. Heres some pics of the dark spots...
 
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my current grow- GrapeGod
my Last grow-2nd round Brainstorm
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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How are the plants overall? Is the just a bit on the lower leaves? Just one or two of em? All of em?
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Dude she isn't as young as she use to be.
-niteowl
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WildBud420
Stranger
Registered: 09/21/13
Posts: 138
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Quote:
hawksapprentice said:
How are the plants overall? Is the just a bit on the lower leaves? Just one or two of em? All of em?
They still seem to be growing fine, the spots are on the top leaves and the white tips are on the new growth/some top leaves. Its seems to be happening to most of the plants.
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my current grow- GrapeGod
my Last grow-2nd round Brainstorm
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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Can I get a pic of the whole plant?
The dark spots do look like a bit of necrosis. Have you had a analysis of your tap water?
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Dude she isn't as young as she use to be.
-niteowl
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WildBud420
Stranger
Registered: 09/21/13
Posts: 138
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heres a couple pics to help, the problem is minor at this stage, i just don't want things getting worse.
As for my water analysis i found this link to a PDF on our tap water quality..water report
   
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my current grow- GrapeGod
my Last grow-2nd round Brainstorm
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 hamloaf
Biometric Precursor.
Registered: 10/21/13
Posts: 193
Loc: Back in the USSR. 
Last seen: 4 months, 13 days
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I never take too much stalk into water analysis's because it changes from year to year. Water sourced municipally is usually has high levels of chlorine in it that are toxic to cannabis plants. Excess chlorine in the water source causes all kinds of nasty symptoms to occur. Water sourced municipally usually needs to have the excess chlorine volatized out into the atmosphere before providing it to your plants.
There are a few ways to volatilize chlorine out of municipally sourced water. 1 is to fill a reservoir of sorts with the municipal water and oxygenate the water with a bubble stone(s) or water pump for 24 hours. The other method is a little more primitive. You just simply fill up a reservoir with the water, let it sit for 24 hours stirring it several times within that 24 hours.
From here it appears that you are in the early to middle stages of a Zinc (Zn) deficiency. Zinc is the most common micro-nutrient found deficient in cannabis. The way I can tell is by the younger leaves showing signs of chlorosis between the veins, and the tips of the new leaves are thin, small blades that are contorting and wrinkling. The plants are getting worse evidenced by the leaf tips turning brown and curling up as well as the the new leaf growth bending horizontally.
Zinc works with manganese and magnesium to promote similar protein actions. Zinc deficiencies are often misdiagnosed as either manganese or iron deficiencies. With zinc though (especially in the progressing stages) new leave blades twist and dry out. Same type of shit will happen to your buds too if the plant was suffering a zinc deficiency in the flowering stage. I'd treat by running a diluted mix of a complete and well balanced hydroponic fertilizer through the system that had chelated trace elements such as zinc, manganese, and iron.
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WildBud420
Stranger
Registered: 09/21/13
Posts: 138
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Re: leaf issue [Re: hamloaf]
#696444 - 12/02/13 12:14 PM (11 years, 25 days ago) |
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Quote:
hamloaf said:
I never take too much stalk into water analysis's because it changes from year to year. Water sourced municipally is usually has high levels of chlorine in it that are toxic to cannabis plants. Excess chlorine in the water source causes all kinds of nasty symptoms to occur. Water sourced municipally usually needs to have the excess chlorine volatized out into the atmosphere before providing it to your plants.
There are a few ways to volatilize chlorine out of municipally sourced water. 1 is to fill a reservoir of sorts with the municipal water and oxygenate the water with a bubble stone(s) or water pump for 24 hours. The other method is a little more primitive. You just simply fill up a reservoir with the water, let it sit for 24 hours stirring it several times within that 24 hours.
From here it appears that you are in the early to middle stages of a Zinc (Zn) deficiency. Zinc is the most common micro-nutrient found deficient in cannabis. The way I can tell is by the younger leaves showing signs of chlorosis between the veins, and the tips of the new leaves are thin, small blades that are contorting and wrinkling. The plants are getting worse evidenced by the leaf tips turning brown and curling up as well as the the new leaf growth bending horizontally.
Zinc works with manganese and magnesium to promote similar protein actions. Zinc deficiencies are often misdiagnosed as either manganese or iron deficiencies. With zinc though (especially in the progressing stages) new leave blades twist and dry out. Same type of shit will happen to your buds too if the plant was suffering a zinc deficiency in the flowering stage. I'd treat by running a diluted mix of a complete and well balanced hydroponic fertilizer through the system that had chelated trace elements such as zinc, manganese, and iron.
thanks for the advice, I flushed out the system and refilled with 50% strength nutes. Hopefully it will help.
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my current grow- GrapeGod
my Last grow-2nd round Brainstorm
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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FYI, that's pretty much the solution to most problems.
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Dude she isn't as young as she use to be.
-niteowl
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WildBud420
Stranger
Registered: 09/21/13
Posts: 138
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Quote:
hawksapprentice said:
FYI, that's pretty much the solution to most problems.
I know, was hoping to avoid draining the res.
Plants still look the same after refilling res,some colour is coming back. Still have white tips, hoping things will get better, think i will increase the nute strength next refill.
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my current grow- GrapeGod
my Last grow-2nd round Brainstorm
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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Re: leaf issue [Re: WildBud420] 1
#696658 - 12/03/13 01:48 PM (11 years, 24 days ago) |
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Leaves don't heal themselves once damaged. You have to look at the growth to see if the problem is fixed.
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Dude she isn't as young as she use to be.
-niteowl
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