My plant is at the beguinning of the flowering stage and I’ve noticed some of the top leafs have some brown spots on them.
I can’t figure out if it is Phosphorus, Calcium or Magnesium deficiency or something else.
I used ox blood during the vegetative phase and BioBloom BioBizz Bloom during the flowering stage.
Thank you!!!
We need more info
First please fill this out
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA
If you can, upload a picture of your plant. It helps the diagnosis, if needed.
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you 
Thanks!
Also here a guide that may help you determine
[quote=“Countryboyjvd1971, post:2, topic:23397”]
brown splotches on leaves…usually one of two things: PH is off. Nute overdose.
The equipment shows you are experienced and using good gear. Not wanting to be rude, but, do you have a PH meter? It is critical to a successful grow and harvest.
No I don’t have a PH meter, I just used some PH paper I had laying around to test the run off and answer Countryboyjvd1971 questions.
Doesn’t nutrient burn usually start from the tips of the leafs? Also this is mostly present on the top leafs.
For the past weeks I’ve been giving her mainly plain water.
If you look at the second picture of the first thread you can see that some leafs are discolored in the middle before the brown spots appear.
Could it be light burn? The plant and the set up are fairly tall and I’m running out of vertical space
I agree that it’s likely a PH issue with lockouts happening. You need a good way to PH your water.
“Generic” soil also makes me nervous.
Nute burn caused by nutrients suddenly becoming available when accidentally hitting the correct PH.
the soil was bought at a flower store with 6/7 PH and some natural fertilizer that by now it’s probably gone
any suggestion on a good PH meter?
Attempting to grow WITHOUT a PH Meter is like driving at night with no lights and blind folded.
Paper PH’ing is a really good way to kill plants.
Leaves will show different types of damage in different places. We know what causes brown/purple splotches on leaves…because…we have ALL EXPERIENCED IT !!!
When you ask for advice, you will be wise to listen, investigate and utilize the informed responses of experienced growers.
Suggest you spend $20 and buy a PH n PPM meter set from Amazon or any other many internet sites. When my PH meter broke…I was in a panic mode until the new one arrived.
Yeah…that important.
Best Wishes
You can get on amazon and look up ph pen you can get a meter and tds meter for 20$ get some 7.0 reference solution 9$ and pack of calibration solutions 6$ and you should be good, also yes that can be burn but plain water for weeks leads me to think after you get your ph under control she’s going to be hungry but recovering so go easy at first and don’t feed full strength, you may want to get some ph up and down too.
After you get your meters run 6.5 ph water through the soil and get runoff from the bottom 15%-20% runoff is good and collect the last cup or so and test it for ph and tds that will let you know your next step.
Here’s one that is popular:
The price went up.
I got a cheap yellow one for like 13$ the only time it drifts more than 0.2 is if the batteries are getting low but we have a dollar store that sells s 4 pack for 1$
From the look of things here, your plant is suffering from light/heat burn. Do you have a fan blowing air across the top of your plant? Most led/cob lights recommend at least 18 inches away. Your plant looks like it’s about 12-13 inches from the tops. I would recommend you lower your plant down 6 or 7 inches more.
Yeah that is my worry, I just added a bigger fan and lowered the plant unfortunately I don’t have too much vertical space, this time around the plant is taller than usual. Another thing that makes me think the problem is related to the light/heat is that the damaged leafs are only the top one of the tallest colas.
This is not my first grow and I never used a PH meter and always had pretty respectable harvests (might not have been the best possible harvests but it has always been pretty good). I definitely gonna give it a try but I suspect that is not the problem in this particular case.
Awesome ph tester
Doesn’t look bad to me.
@M0bi0us i run the full biobizz line up and while i am an auto grower i have had the same symptoms on my early grows. I trial and errored my way to a cal/mag def. I have found bio bloom a little weak and i hit 4-5ml/ltr mark on my autos which is almost what they recommend for a photo. Are you running cal/mag? I pretty much use it at some strength all grow until flush. Hope this helps. OnE LoVe
A Clown soil grower 
turns into Mr.Bad hydroponic grower with a PH meter.
Get one you can trust
