Is this Heat Stress, a pH problem, or nute issue?

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obiebongz420

Active Member
I have attached 5 pictures, each picture of a different plant
the first 2 photos are a Strawberry Blue Strain
the last 3 are a Skunk No.1 Strain

They are inside a grow tent
600watt mH Light
with 4" exaust fan with carbon filter
Lights on Temps no higher than 79*F
Lights off Temps no lower than 69*F
Humidity during lights on is around 40-47% and 50-60% during lights off
I have a fan inside the tent for circulation

since I have discovered my taco leaves I have raised my light and shut off my fan, and have been misting these babies at lights off for the last 2 days assuming this is heat stress and thinking the leaves are getting to dry

However,

I have a pH Digital Soil Probe as well as a pH Test Kit for aquariums... in each pot the probe read 4.5 to 5.0 and at my last watering which was 3 days ago I tested the run-off on a few containers and it tested at about 5 to 5.5
Which should I trust?! The Digital Probe or the liquid runoff test?!
 

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obiebongz420

Active Member
which reading should I trust.... the probe that I stick in the soil of each pot.... or the run off I get when I water them?
cuz my soil meter says 4.5 to 5.0 .. and 3 days ago my runoff, when tested with an aquarium kit, the color looked to be about 5 to 5.5

I know either way that my pH needs to come up, I'm just trying to figure out which to trust so I know how much to move my pH

this is my first grow
 
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caregivers

Member
Hmmm I think you need to check you run off BUT dont hold me to that, since i grow hydro style. Hopefully a soil master will answer soon. But I do know this if you are growing soil you want your ph to be around 6.5. 5.5 is more for a hydro grow. Hope this helps a bit.
 
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obiebongz420

Active Member
caregivers said:
Hmmm I think you need to check you run off BUT dont hold me to that, since i grow hydro style. Hopefully a soil master will answer soon. But I do know this if you are growing soil you want your ph to be around 6.5. 5.5 is more for a hydro grow. Hope this helps a bit.
Click to expand...
yeah i knew either way that pH needs to come up.... just trying to figure out how much I need to come up based on which reading lol
 
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skoobie dew

Well-Known Member
obiebongz420 said:
which reading should I trust.... the probe that I stick in the soil of each pot.... or the run off I get when I water them?
cuz my soil meter says 4.5 to 5.0 .. and 3 days ago my runoff, when tested with an aquarium kit, the color looked to be about 5 to 5.5

I know either way that my pH needs to come up, I'm just trying to figure out which to trust so I know how much to move my pH

this is my first grow
Click to expand...
So you're putting tap water usually ph 6-8, into soil that is ph 4.5-5.5 and the run off is 5-5.5. let me do the math here..... 6(starting water)+4.5(soil) divide by by 2 = 5.25 aka 5-5.5.

hmmm.... :wall: My guess is the ph soil meter and the aquarium kit are working fine.:wall:

Next time get a different kind of soil. What kind of soil did you get?

And by the way, your tap water will probably correct the low soil ph problem on it's own.
 
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obiebongz420

Active Member
skoobie dew said:
So you're putting tap water usually ph 6-8, into soil that is ph 4.5-5.5 and the run off is 5-5.5. let me do the math here..... 6(starting water)+4.5(soil) divide by by 2 = 5.25 aka 5-5.5.

hmmm.... :wall: My guess is the ph soil meter and the aquarium kit are working fine.:wall:

Next time get a different kind of soil. What kind of soil did you get?

And by the way, your tap water will probably correct the low soil ph problem on it's own.
Click to expand...
my tap comes out at about 7.6. to 7.8 .. let it set for 24 hours and I might get to around 7.2 to 7.4 ...I then use ph Down (Sulfuric Acid) and if necessary pH Up (sodium carbonate) to achieve a solid 7.0 tap water

using top soil with these ingredients
Per Gallon of Soil, mixed in before planting.
2 Tablespoons - Bat Guano (10-2-1)
2 Tablespoons - Bone Meal (3-15-0)
2 Tablespoons - Green Sand (0-0-3)
3 Tablespoons - Kelp Meal (1-0.1-2)
1 Tablespoons - Blood Meal (13-0-0)
2 Tablespoons - Gypsum
10% of soil mix - Worm Castings
50% of soil mix - Perlite
 

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iwearnopants

iwearnopants

Member
ph for soil should be around 5.5 for soil. use distilled water and measure ph after mixing in nutes to distilled water. the more you spray the leaves you open the stomata's and the leaves tend to droop more. they look healthy to me nice nitrogen lime green color, if anything lower humidity a bit and leaves will perk up keep up the fun good luck
 
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obiebongz420

Active Member
iwearnopants said:
ph for soil should be around 5.5 for soil. use distilled water and measure ph after mixing in nutes to distilled water. the more you spray the leaves you open the stomata's and the leaves tend to droop more. they look healthy to me nice nitrogen lime green color, if anything lower humidity a bit and leaves will perk up keep up the fun good luck
Click to expand...

I also have distilled water... the only reason I have NOT been using DISTILLED is when I open a NEW gallon of Distilled and check the pH level before adding anything, it tests around 5.5 ...isnt that too low to start with.... my tap starts around 7.6 and with a few drops of sulfuric acid (pH Down) I can get my tap to balance at 7.... why is Distilled water more acidic than my tap?

and I thought 5.5 was more for hydro and 6.5 was for soil
 
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monkeybones

Well-Known Member
My plants are at about the same stage as yours and some of them exhibit the same sort of leave cup. Not all of them though. Just a few.

But your leaves look remarkably healthy considering your PH reading. I wouldn't be too disheartened. Fix your PH and don't overthink anything and you'll do great.

It will be interesting to finally receive my PH/moisture meter and to compare my PH to yours with consideration given to the similarity in leaf stucture.
 
s7even

s7even

Active Member
your plant looks really good to be honest i don't think you should be worried or worked up about it too too much, just make shur you don't give it nutes for a while and when you do dont do it every time you water and you should be good to go.
another reason y leaf tips point up like that is because its to hot (dry hot) and the plant it pointing the tips up like that to help direct the air flow through its leafs more (if there is a breeze) to help cool it's self down. so just curious... do you have a fresh air intake at all in your tent? or is it just stale air being pushed around? and the humidity in your grow room around 40% is ok but u can get it to 60 during veg if can. If you want to quickly increase your humidity you can get a mug of water and put it in your grow room, also take some paper towel and fold it up like a wick and put it in the cup half in and half out to help evap the water in the mug faster. or you can hang a wet towel in the grow room.
the initial temp in there isnt that bad because in my grow room its always at about 35 deg Celsius which is close to your temp, its just crucial that u get fresh air in there as much as possible
Just some ideas hope they help you out
 
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speeka

Well-Known Member
50% perlite is too much, that's a lot of medium replaced by an inert substance. Micro herd wont be happy. Your water is fine at that pH from tap, water below 6.5 is no good in soil.

leaves cupping up is usually moisture related, i would raise my day time RH to around 60-65 %, your night time RH is perfect.
 
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obiebongz420

Active Member
s7even said:
your plant looks really good to be honest i don't think you should be worried or worked up about it too too much, just make shur you don't give it nutes for a while and when you do dont do it every time you water and you should be good to go.
another reason y leaf tips point up like that is because its to hot (dry hot) and the plant it pointing the tips up like that to help direct the air flow through its leafs more (if there is a breeze) to help cool it's self down. so just curious... do you have a fresh air intake at all in your tent? or is it just stale air being pushed around? and the humidity in your grow room around 40% is ok but u can get it to 60 during veg if can. If you want to quickly increase your humidity you can get a mug of water and put it in your grow room, also take some paper towel and fold it up like a wick and put it in the cup half in and half out to help evap the water in the mug faster. or you can hang a wet towel in the grow room.
the initial temp in there isnt that bad because in my grow room its always at about 35 deg Celsius which is close to your temp, its just crucial that u get fresh air in there as much as possible
Just some ideas hope they help you out
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no, unfortunately I do not have an intake fan, just a 4 inch inline exhaust with attached carbon filter.. and then I have a 1.5 foot household floor fan for circulation inside the tent... I open the tent 2-3 times a day, and sometimes leave a section of tent unzipped for air intake... I today however, have opened an addition vent hole on the tent for more intake... I have a cool invisible mist humidifier inside the tent as well, it is powered by a photo-cell switch that shuts the humidifier off automatically when the lights come on, and turns the humidifier on when the lights go off ;) ..should I run this humidifier constantly?!

I might try your paper towel in cup, or wet towel idea, which I had been pondering for the last day or two :)
 
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obiebongz420

Active Member
speeka said:
50% perlite is too much, that's a lot of medium replaced by an inert substance. Micro herd wont be happy. Your water is fine at that pH from tap, water below 6.5 is no good in soil.

leaves cupping up is usually moisture related, i would raise my day time RH to around 60-65 %, your night time RH is perfect.
Click to expand...
by the time I mixed everything up using a soil recipe i found online... 50% was from a 5 gal mix... and I didnt use a complete 50%... I had 5 gals of soil I mixed in to my organic amendments to 3.75 gal of perlite, mixed thoroughly in a big cooler before I divided it into each container and transplanted... so each container doesnt contain 50% perlite...

Is the cupping leaves a sign they want misted at lights off?
 
smokie927

smokie927

Active Member
obiebongz420 said:
I also have distilled water... the only reason I have NOT been using DISTILLED is when I open a NEW gallon of Distilled and check the pH level before adding anything, it tests around 5.5 ...isnt that too low to start with.... my tap starts around 7.6 and with a few drops of sulfuric acid (pH Down) I can get my tap to balance at 7.... why is Distilled water more acidic than my tap?

and I thought 5.5 was more for hydro and 6.5 was for soil
Click to expand...
Your plants look fine, You want to water from the bottom you'll get way more growth and happier root systems. I wouldn't even worry about your ph until your plants are bigger, normal tap water with ph of 7.6 and minor veg nuts will balance out ok. you actually want your ph around 5.8-6 when it's time to test,this is known best for nitrogen absorbtion. After the first few weeks of watering from the bottom you,"if you want", start watering from the top or both. Hope they grow well. Stay up Oregon,the chronic state.:weed:
 
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obiebongz420

Active Member
smokie927 said:
Your plants look fine, You want to water from the bottom you'll get way more growth and happier root systems. I wouldn't even worry about your ph until your plants are bigger, normal tap water with ph of 7.6 and minor veg nuts will balance out ok. you actually want your ph around 5.8-6 when it's time to test,this is known best for nitrogen absorbtion. After the first few weeks of watering from the bottom you,"if you want", start watering from the top or both. Hope they grow well. Stay up Oregon,the chronic state.:weed:
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water from the bottom?! im not growing upside down lol ....

what do you mean, insert a hose into my containers at the bottom?
 
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obiebongz420

Active Member
well I think I have corrected the pH issue...

I ground up 2 teaspoons of garden lime pellets I had to a fine dust, and mixed the 2 tsp into a gallon of water...

I then took the same ground up lime pellets and sprinkled 1/4 teaspoon into each container evenly and cultivated the top 1-2 inches of the medium with out damaging any roots.. and then watered with the lime water...

rechecked levels today and all are on the rise, including the one that was 4.5
 
smokie927

smokie927

Active Member
obiebongz420 said:
water from the bottom?! im not growing upside down lol ....

what do you mean, insert a hose into my containers at the bottom?
Click to expand...
From your pics it looks like your growing soil in 1-3 gallon pots. Now if thats true,then get a plate or drain tray for your pots set your pots in it and fill up your tray(s),by doing this your plants will soak the water up from the bottom. This technique is best for your seedlings up to 3 weeks or the whole cycle. It allows your plants to take up only what they need while your soil doesn't get saturated like it can when you water from the top,meaning: you don't overwater. Hope this helps.:leaf:
 
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obiebongz420

Active Member
smokie927 said:
From your pics it looks like your growing soil in 1-3 gallon pots. Now if thats true,then get a plate or drain tray for your pots set your pots in it and fill up your tray(s),by doing this your plants will soak the water up from the bottom. This technique is best for your seedlings up to 3 weeks or the whole cycle. It allows your plants to take up only what they need while your soil doesn't get saturated like it can when you water from the top,meaning: you don't overwater. Hope this helps.:leaf:
Click to expand...


hmmm sounds like something to experiment with.... got 5 little girls, might try it with one or 2
 
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