need help!

[SmokeandFly123]

hi all,

so this is my first grow. i am growing in biobizz light mix soil while using biobizz nutrients.
i am growing 3 autoflower plants and around day 30 i started to get some lower leaves turn yellow.
after some reading and comparing pictures online i thought i might have a nitrogen deficiency.
so increased nutrients but problem quickly started to get worse, with leaves turning yellow and wilting fast... plus spreading up the plant.
so....done some more googling and thought maybe magnesium deficiency.
this is some pics taken today on day 41.
any ideas?
help appreciated

 

[MustGro]

Sure could be magnesium deficiency. Here's a link with great pics https://www.growweedeasy.com/marijuana-symptoms
Here's a similar link to yours https://www.rollitup.org/t/leaves-yellowing-on-day-32-0f-flower.1051811/post-16283909
You could try @Rurumo 's suggestion and put some epsom salts on them.
The other thing it might be is light burn; you using powerful LEDs?

 

[SmokeandFly123]

i actually bought calmag today, does the same job as epsom salts?
i am using 1200w LEDs.
wouldn’t light burn effect top leaves closest to light?
the top leaves are the least effected and i can’t really see any light burn but i have had consistent temps of around 30c-32c since turning on full spectrum

 

[Bobkatar]

Hi bro one question in how many days you start feeding her with biobizz nuts?

 

[JordanZz]

i actually bought calmag today, does the same job as epsom salts?
i am using 1200w LEDs.
wouldn’t light burn effect top leaves closest to light?
the top leaves are the least effected and i can’t really see any light burn but i have had consistent temps of around 30c-32c since turning on full spectrum

30/32c a little high maybe? I grow between 20/26c and seems to be okay

 

[weRideVRods]

I use the liouinox once every 2 weeks half strength and I use the calmag once a week and well go see if you can spot anything other then green

 

[FastFreddi]

i actually bought calmag today, does the same job as epsom salts?
i am using 1200w LEDs.
wouldn’t light burn effect top leaves closest to light?
the top leaves are the least effected and i can’t really see any light burn but i have had consistent temps of around 30c-32c since turning on full spectrum

Are you ph -ing anything? You may have caused a lockout.
Looks to be the start of magnesium issues...Temps at lights off near root zone?
I suspect a ph problem.
FF

 

[FastFreddi]

Are you ph -ing anything? You may have caused a lockout.
Looks to be the start of magnesium issues...Temps at lights off near root zone?
I suspect a ph problem.
FF

i actually bought calmag today, does the same job as epsom salts?
i am using 1200w LEDs.
wouldn’t light burn effect top leaves closest to light?
the top leaves are the least effected and i can’t really see any light burn but i have had consistent temps of around 30c-32c since turning on full spectrum

Too many are automatically dumping calmag....usually only required with ro water.
FF

 

[weRideVRods]

Too many are automatically dumping calmag....usually only required with ro water.
FF

yup I will agree with you, alot of ppl seem to think it's the cure all and go overboard.

 

[kodak91]

Its not uncommon to biobizz soil to run out of calcium and magnesium after 4 weeks. Your tapwater might be very soft.

What is the ph that you are feeding your plant with? You might be locking out calmag.

 

[SmokeandFly123]

Hi bro one question in how many days you start feeding her with biobizz nuts?

around day 14 i started 1/4 strength nutes

 

[SmokeandFly123]

30/32c a little high maybe? I grow between 20/26c and seems to be okay

ideally i would like the temp lower. temp was around 25/26c with just veg lights on but full spectrum raised it. i might have to buy AC to keep temps lower

 

[JordanZz]

ideally i would like the temp lower. temp was around 25/26c with just veg lights on but full spectrum raised it. i might have to buy AC to keep temps lower

You could increase airflow and extraction to try and cool it down a bit

 

[SmokeandFly123]

Are you ph -ing anything? You may have caused a lockout.
Looks to be the start of magnesium issues...Temps at lights off near root zone?
I suspect a ph problem.
FF

lots of different opinions on the ph-ing with organic soil so i haven’t checked ph once.
if i remember correctly i think the water in my area is around the 200ppm mark.
i don’t let the water sit for 24 hours like some ppl do, is this a mistake?

 

[SmokeandFly123]

You could increase airflow and extraction to try and cool it down a bit

i have two 6 inch oscillating fans, passive intake with more than a good enough extraction fan causing negative pressure.
prob is i got my tent in a cupboard under the stairs for stealth, and i can open door at certain times but the heat builds up.

 

[SmokeandFly123]

Too many are automatically dumping calmag....usually only required with ro water.
FF

i only bought it because lots of ppl using biobizz seem to have magnesium prob start around 2-3rd

yup I will agree with you, alot of ppl seem to think it's the cure all and go overboard.

is that common amongst newbs?

 

[FastFreddi]

lots of different opinions on the ph-ing with organic soil so i haven’t checked ph once.
if i remember correctly i think the water in my area is around the 200ppm mark.
i don’t let the water sit for 24 hours like some ppl do, is this a mistake?

I don't either...no problems for me with chloramines at all.
FF

 

[kodak91]

lots of different opinions on the ph-ing with organic soil so i haven’t checked ph once.
if i remember correctly i think the water in my area is around the 200ppm mark.
i don’t let the water sit for 24 hours like some ppl do, is this a mistake?

Lots of missinformartion yes. But you do need to check PH. You are not growing organic, mate. Buying and using organic products like biobizz doesnt mean you are growing "organic". You are still feeding the plant through bottled nutes so you should ALWAYS check and adjust the PH. With biobizz if you water with a higher PH then needed, the microorganisms will act as PH down and adjust to the 6.2-6.8 range. BUT if you feed your plant with less then 6.2ph, the microorganisms cant PH up, so you are locking out nutrients. Cal and Mag are best absorbed in soil at 6.5ph.

 

[kodak91]

i don’t let the water sit for 24 hours like some ppl do, is this a mistake?

And no, this is also a myth. You dont need to dechlorinate the tapwater.

 

[Trippybean]

hi all,

so this is my first grow. i am growing in biobizz light mix soil while using biobizz nutrients.
i am growing 3 autoflower plants and around day 30 i started to get some lower leaves turn yellow.
after some reading and comparing pictures online i thought i might have a nitrogen deficiency.
so increased nutrients but problem quickly started to get worse, with leaves turning yellow and wilting fast... plus spreading up the plant.
so....done some more googling and thought maybe magnesium deficiency.
this is some pics taken today on day 41.
any ideas?
help appreciated

My first grow as well a couple of my GG4 autos did the same thing i think it was a ph issue cause I adjusted it and now its fixed i wish u luck