The plant is about 1m tall, Ca Mg is 50 15 respectively.
I grow in Bio Terra Professional and feed with Bio Flores (NPK 6-6-20) with every watering.
What do you think is the solution for it?
3 Likes
You will get more help with a pic of the whole plant it shows a lot more info, and will save you answering a lot more questions shortly.
Whats your temps and RH like, what is the PH of the water you are feeding at, has your PH meter been checked recently?
Did it start at the top middle or bottom of the plant, just old leaves or new as well.
Looks more like a P deficiency to me on the right side leaf, or over watering maybe, hard to say on the limited info…
8 Likes
Doesn’t look like a Magnesium deficiency to me. I agree that knowing more about what the rest of the plant looks like would be helpful in diagnosing the problem.
3 Likes
Hello Shadey,
It did start at the bottom of the plant, the rest of the plant looks healthy.
My temp is 28C, humidity is 30-45%, runoff pH is 6.2 (soil pH is 5.8), runoff PPM is ~650.
My meters have been recently calibrated and tested.
It could be a Phosphorus deficiency, haven’t had much experience with it.
2 Likes
Hello Howard.Crane,
What does it look like to you?
1 Like
28c is running kinda hot. You got pics of the full plants? What stage of growth? Although yellow they’re lacking the “barring” of the veins. Which would indicate a mag deficiency. I’d be inclined to agree with the P def
5 Likes
It does look a bit like P def to me, pretty similar to what I’ve experienced when there’s enough P being fed, but the plant can’t use it for some reason that still needs to be diagnosed. In my experience that has most often been due to over watering or environmental conditions.
That’s the frustrating thing about diagnosing plant problems: there are often related but non-visible confounding factors that make a simple determination based on appearance difficult. Sometimes pathologically so 
6 Likes
Yeah the temps are a bit high, especially with the low RH, those plants will be drinking heavily, to expirate enough to keep cool.
This can cause nutrient burn from uptaking more nutrients than needed, with the water it needs to expirate. Normally that will also cause a K deficiency later as K is responsible for water uptake and regulation just as in humans, but with that high K level in your feed I think the P has bottomed out first.
I don’t use bottle nutes, but that seems more like a last 3-2 weeks of flowering mix. What I understand is with most nutrients it’s a 2-1 ratio P to K for a healthy soil PH but again not sure as I grow no till organic.
I would suggest dropping your temps or raising the humidity, and add a bit more P. Provided the soil is drying out ok and the plant is not drowning.
7 Likes
Hello Colanoscopy,
I do agree on the temp, can’t do much about it though, room has an oil radiator with out a shutoff valve.
This is Sherbet Cookies, planted on Aug.18.
Howard.Crane,
I think you are right, the medium probably needs a good flush to sort things out.
Shade,
That’s good advice, thank you.
I can see how Phosphorus can run dry before the rest.
Do you think that I’m giving it enough N & K?
Do any of you think that I’m not feeding enough Ca, Mg in a first place?
CANNA Terra allready has dolomite lime in it, but it could be that for some reason it is not available to the plant.
5 Likes
The plant looks fine to me apart from a bit of tip burn. I think you are just getting the old fan leaves dying off.
4 Likes
Hi bro heat is a biggie if you can run a clip on fan to circulate the air it would help a lot
I see leaves tips burnt and turning downward most likely to the heat
The leaf decolonization looks like trace minerals
Do you use teas in your grow if so add table soon Epson salts also bone meal and blood meal and molasses
Try not to use too much cal mag it can cause some issues
Peace
4 Likes
On closer inspection I’d say heat and low humidity are your issues mate. Can you not feed an intake into the room from somewhere cooler?
4 Likes
My grow area has temperature issues and I find this Silica Blast helps strengthen cell walls and keep the chlorophyll intact. It has become part of my daily watering and my plants loving it.
5 Likes
I agree that it looks like a very minor P deficiency. That said that plant looks perfectly healthy otherwise, you might cause more issues by trying to chase deficiencies. Losing a leaf here and there is pretty much inevitable, personally I’d keep right on with what you’re doing!
8 Likes
That’s what I was thinking, majority of the plant looks good and healthy, maybe a bit of P deficiency but I would try and raise the humidity to correct the issue if you can’t lower the heat, rather than add some extra P and throw off the balance.
3 Likes
I’ve managed to stop the spread of the yellow leaves by flushing.
A small fluctuation in the blood’s acidity is deadly.
- CANNA
Not only P was drawn but also Ca and Mg.
@Shadey Big fan leaves should not be dying off.
Adding P would not help if pH is the problem.
Hi @Papalag , thanks for the advice.
@anon58740919 It’s not my flat, I can’t exactly cut a hole trough the wall mate.
@herb4ever I was thinking that until I’ve found out that BioCANNA allready has silicon in it.
@beacher it is crucial to catch a deficiency at an early stage and prevent it from spreading throughout the whole plant.
5 Likes