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- #141
millertm
Well-Known Member
You stated T12 bulbs, but I see a Mag and coil ballast running in last 2 pix. Keep your grow room under 80°, photosynthesis will stop over 85°.
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millertm
Well-Known Member
Great recovery, I'd say that since I see older leafs yellowing and new growth looks good. You are under feeding. If yellowing spreads to upper growth you will have other issues. Add micro nutes for this to correct. Add macro for upper leafs yellowing. Since no claw or twisted leaf mass PH looks good with no signs of over feeding.
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Never heard of this before. Could you explain better? Outdoor grows exceed 85 in almost every situation and I have seen many indoor grows regularly exceed 85 degrees. My own included.
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- #145
i had the t12 but i now have 125w cfl daylight
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- #146
The yellowing is only at the bottom
whats micro and whats macro?
ph of run off is approx 6.8
ive only fed them once and watered 2 times...
Macro nutrients are your big 3 NPK. Micros are all the others.
What millertm wrote is a little misleading though. The area of growth effected does not point toward macro or micro nutrients, but rather mobile or immobile nutrients.
Mobile nutrient deficiencies will be seen in older fan leaves, because the plant is taking the stored nutrient in those leaves and mobilizing it to promote new growth.
If you have a deficiency in new growth, then it points to an immobile nutrient, as the plant cannot pull this resource in from another part of the plant, so it's new growth gets effected by the deficiency.
When I get on the computer I will post a chart that shows which nutrients are mobile and immobile and has pictorials of each common deficiency.
What millertm wrote is a little misleading though. The area of growth effected does not point toward macro or micro nutrients, but rather mobile or immobile nutrients.
Mobile nutrient deficiencies will be seen in older fan leaves, because the plant is taking the stored nutrient in those leaves and mobilizing it to promote new growth.
If you have a deficiency in new growth, then it points to an immobile nutrient, as the plant cannot pull this resource in from another part of the plant, so it's new growth gets effected by the deficiency.
When I get on the computer I will post a chart that shows which nutrients are mobile and immobile and has pictorials of each common deficiency.
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- #148
millertm
Well-Known Member
Yes mobile and non mobile, if you have a good grow nute it's taken care off. Cal Mg solutions also are used on stressed plants but it will raise PH.
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Growlow
Well-Known Member
I'd strongly encourage you to follow the advice from UltraDan and Major PITA. They're leading you to the promised land mate. Take note that any CalMag I'm familiar with will not raise pH it will do the exact opposite.
DeanB
New Member
Does that say 90 degrees? See if you can't get it down 5 degrees. The lights are fine where they're at. The fan though needs to be pushing that hot air out. Try hanging the fan in the back of the cabinet or ???
millertm
Well-Known Member
Sorry, trying to help.
Calcium hydroxide - Wikipedia, the free encyclopedia
But it seems this is quite basic with acid Pka of 12. Higher number weaker acid. Pkb of 2 is strong base. Not sure how it dropped your PH, some store bought Cal Mg solutions could be buffered. Epson salt is very alkaline too. I've seen it used at 1 TSP gal and it took PH 7 water over 8.5.
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Calcium hydroxide - Wikipedia, the free encyclopedia
But it seems this is quite basic with acid Pka of 12. Higher number weaker acid. Pkb of 2 is strong base. Not sure how it dropped your PH, some store bought Cal Mg solutions could be buffered. Epson salt is very alkaline too. I've seen it used at 1 TSP gal and it took PH 7 water over 8.5.
Cheers
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Growlow
Well-Known Member
As an example Dolomite is essentially CalMag. I can show you a video if needed. My tap water comes out at about 7.8-8 add 1/4 cup of Dolomite and the pH drops to about 7.3
Growlow
Well-Known Member
Did up a quick video for ya mate 
Let me just say I'm not trying to be Mr Right or belittle you Millertm. Just sharing what I know.
Let me just say I'm not trying to be Mr Right or belittle you Millertm. Just sharing what I know.
DeanB
New Member
Millertm is talking about Calcium Hydroxide and Growlow is talking about Calcium Carbonate ?
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Growlow
Well-Known Member
I've not heard of any CalMag being made of Calcium Hydroxide. Then again I haven't messed around with a lot of bottled CalMAg's. The only Calcium Magnesium supplement I have used besides raw materials like Dolomite Lime is GeneralOrganics Calmag+ and that is also made of Calcium Carbonate, Magnesium Carbonate and a lil Iron.I am aware that Calcium Carbonate can neutralize acidic rich soils. Magnesium Carbonate has the same affect but is weaker in nature. Which would generally support what Millertm says. All I'm aware of is how it reacts in powdered form. When I used the liquid form it was in DWC and I'd never grown with bottled nutes so from memory the bottled stuff also slightly dropped the pH but increased the PPM.
Dolomite Lime is a mix of calcium carbonate and magnesium carbonate. Both are slow acting and therefore considered safe for garden applications.
Calcium Hydroxide is also known as hydrated lime or caustic lime. It is very fast acting and considered to be moderately dangerous to use. It can seriously burn you and your plants.
I have not heard of Calcium Hydroxide ever being used outside of an industrial or cleaning application and I would never use it as a soil amendment.
Calcium Hydroxide is also known as hydrated lime or caustic lime. It is very fast acting and considered to be moderately dangerous to use. It can seriously burn you and your plants.
I have not heard of Calcium Hydroxide ever being used outside of an industrial or cleaning application and I would never use it as a soil amendment.
Here is that chart..
It is also important to note that not all "mobile" nutrients are created equal. Some are much more mobile than others (semi-mobile?). Also, while something like calcium is mobile, if the soil has lots of potassium, it will lower the uptake of calcium and magnesium. The potassium ions are more available to the plant.
I"m not great at a lot of nute diagnostics. The yellow margins look to me like they could be any of these: potassium, calcium or magnesium (or a combo). I'd hit it with some Cal-Mag or CaliMagic.
I"m not great at a lot of nute diagnostics. The yellow margins look to me like they could be any of these: potassium, calcium or magnesium (or a combo). I'd hit it with some Cal-Mag or CaliMagic.
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- #160
Hey yall things are looking awesome...
I fed them yesterday... They are still under 16/8 lights
And they have pre flowers all over
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I fed them yesterday... They are still under 16/8 lights
And they have pre flowers all over
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