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.
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
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 $20 and buy a PH n PPM meter set from Amazon or any other many internet sites. When my PH meter broke…I was in a panic mode until the new one arrived.
You can get on amazon and look up ph pen you can get a meter and tds meter for 20$ 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.
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.
@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