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Offlinesmurf_master
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Registered: 05/12/11
Posts: 413
Loc: Everywhere Flag
Last seen: 2 years, 8 months
Older leave brown spots
    #559088 - 05/28/11 06:55 PM (5 years, 6 months ago)

Using Fox Farms nutrients, with molasses every other watering of distilled water.


All the new grow is green and healthy, the only leaves that look troubled are older and below the main canopy.

Temps 68-79
RH 30-45%




Thoughts?


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Offlinemuse42
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Registered: 04/21/10
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Re: Older leave brown spots [Re: smurf_master]
    #559148 - 05/29/11 01:55 AM (5 years, 6 months ago)

Quote:

Soil Growers:
1. Are you growing from seed or clones?
2. How old are your plants?
3. How tall are your plants?
4. What size containers are they planted in?
5. What is your soil mix?
6. How often do you water and what type of water do you use?
7. What is the pH of your water?
8. What kind of fertilizer do you use and what is its NPK ratio?
9. Do you foliar feed or spray your plants with anything?
10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")
11. How close are your lights to the plants?
12. What size is your grow space in square feet?
13. What is the temperature and humidity in your grow space?
14. What is the pH of the soil?
15. Have you noticed any insect activity in your grow space?
16. How much experience do you have growing?




--------------------
It looks like it's going to be another Gravity Bong type day...



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Offlinesmurf_master
Master Smurf


Registered: 05/12/11
Posts: 413
Loc: Everywhere Flag
Last seen: 2 years, 8 months
Re: Older leave brown spots [Re: muse42]
    #559216 - 05/29/11 12:05 PM (5 years, 6 months ago)

Clones
5 Weeks
1.5 feet
2 gallon containers
Fox Farms
Every 3 days, distilled
7
Fox Farms
No
400 Watt HPS, 40 watt CFLs
1 foot
68-79, 20-45% RH
Don't PH
No


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OfflineTank333
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Registered: 08/20/10
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Re: Older leave brown spots [Re: smurf_master]
    #559230 - 05/29/11 12:21 PM (5 years, 6 months ago)

I would check the ph of your soil. Its probably too high if your water is starting out at 7...


--------------------
My best run so far


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Offlinesmurf_master
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Re: Older leave brown spots [Re: Tank333]
    #559231 - 05/29/11 12:24 PM (5 years, 6 months ago)

I always thought that 7 was basically neutral, I haven't bothered with PH since I began growing since I always used distilled water. Am I wrong in my thinking?


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OfflineTank333
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Re: Older leave brown spots [Re: smurf_master]
    #559233 - 05/29/11 12:27 PM (5 years, 6 months ago)

Its my understanding that as your soil takes in nutrients, it causes the PH to rise, because it leaves behind all the salts... I may be wrong, but that's my best guess. :shrug:


--------------------
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Offlinemuse42
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Re: Older leave brown spots [Re: Tank333]
    #559509 - 05/30/11 03:01 AM (5 years, 6 months ago)

I very well could be your soils pH. 

I use FFOF with Grow Big and Tiger Bloom nutes. 
I used distilled water that I do not adjust when I water as well.  I have found that most of the distilled water I use falls in the 6.7 -6.9 pH range.
pH adjusting distilled water by the gallon is stupid hard and a waste of time in my opinion.

Are you feeding every other watering? 
What Fox Farm nutes are you giving them? 
How much each feeding? 
Do you adjust the pH of your nute mix when feeding and if so what do you adjust it to?


--------------------
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Offlinesmurf_master
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Re: Older leave brown spots [Re: muse42]
    #559511 - 05/30/11 03:09 AM (5 years, 6 months ago)

I usually feed them every other watering but I went a few weeks heavy nutes to see the results and they responded nicely. Added some lights to the under canopy facing upwards and back to nutes every other watering alternating with molasses, and the lowers leaves are back to a nice green.


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Offlinemuse42
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Re: Older leave brown spots [Re: smurf_master]
    #559521 - 05/30/11 03:26 AM (5 years, 6 months ago)

Quote:

What Fox Farm nutes are you giving them? 
How much each feeding? 
Do you adjust the pH of your nute mix when feeding and if so what do you adjust it to?




--------------------
It looks like it's going to be another Gravity Bong type day...



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Offlinesmurf_master
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Posts: 413
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Last seen: 2 years, 8 months
Re: Older leave brown spots [Re: muse42]
    #559609 - 05/30/11 11:58 AM (5 years, 6 months ago)

All of them
Following the schedule
No


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Offlinemuse42
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Re: Older leave brown spots [Re: smurf_master]
    #559767 - 05/30/11 07:50 PM (5 years, 6 months ago)

Quote:

Following the schedule
No




I would say you for sure have a pH issue, and it's only going to get worse.
When I add 3 tsp of just Grow Big/gallon to my distilled water, the pH of my feeding solution drops to 5.0 range.  It will only get worse, the more Tiger Bloom you start using.  Flowering nutes makes the pH drop even further.  Those are the only 2 nutes I have experience with and currently use.

I may be wrong, but I have never heard of anyone not having to adjust their pH when adding nutes.

You should add your nutes to your distilled water, and then use pH up or down, most likely up, to correct the pH back to a suitable range.  For soil, pH 6-7 will work.  I stay in the 6.3-6.7 pH range.


--------------------
It looks like it's going to be another Gravity Bong type day...



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