Help with some issues

[pimpampum]

Hi guys, I hope someone can give me some advice/help. Broke soil around the 15th of March

Plant -> canna cheese 1:1 by mephisto

Soil -> canna professional

Feeding -> I started with 1/4 of the dosis on the biobizz feeding chart and I increased to a full dosis every other watering (I'm not giving fish mix at this point)

Temps and RH -> temps between 20°C (lights off) and 26°C (lights on); RH between 45%-55%

Lights -> spiderfarmer SF2000 (60 cm above canopy)

PH -> between 6.2 and 6.4

Light schedule -> 19h on/ 5h off

Lot's of airflow and exhaust always on.

2 of the plants were topped around day 21 but every plant is showing deficiencies.
What can it be? N deficiency?
Should I decrease the feeding? Should I flush? Give more calmag? I'm really lost at this point...

Thanks a lot

 

[Cannaficionado]

Hi guys, I hope someone can give me some advice/help. Broke soil around the 15th of March

Plant -> canna cheese 1:1 by mephisto

Soil -> canna professional

Feeding -> I started with 1/4 of the dosis on the biobizz feeding chart and I increased to a full dosis every other watering (I'm not giving fish mix at this point)

Temps and RH -> temps between 20°C (lights off) and 26°C (lights on); RH between 45%-55%

Lights -> spiderfarmer SF2000 (60 cm above canopy)

PH -> between 6.2 and 6.4

Light schedule -> 19h on/ 5h off

Lot's of airflow and exhaust always on.

2 of the plants were topped around day 21 but every plant is showing deficiencies.
What can it be? N deficiency?
Should I decrease the feeding? Should I flush? Give more calmag? I'm really lost at this point...

Thanks a lot

So exactly how far along in your grow are you. What is the breeder reccomend harvest window and where are you right now.

I do see what looks to be problems, Nitrogen is a mobile nutrients meaning the problems would start on older growth towards the bottom. You're well into flower and shouldnt be feeding anything high in Nitrogen, this will stunt flowering. Seems like you got a lot of dry crispy leaves at the top. How did the dead parts start showing up, at the edges of the leaf (margins) or did it start from the center and consume the leaf from there?

My guess would be that maybe your overloaded on phosphorus or potassium and its locking out most of your secondary nutrients like sulphur, calcium, manganese, and magnesium. Are you using any p-k boosters?

Trying to find your soil online but not sure Im finding it. Is it peat or coco based or is it a blend?

 

[pimpampum]

Seeds broke soil on 15th March so I'm around week 10. Breeder says this strain harvest is between day 80-90.
The plant with the crispy leaves started showing some brown spots in the center of the leaves and start spreading to the tip of the leaves, drying the tips and making them crispy.
Bio bloom is a p-k booster so yes, I'm using it.
This is the soil I'm using.

 

[Cannaficionado]

Seeds broke soil on 15th March so I'm around week 10. Breeder says this strain harvest is between day 80-90.
The plant with the crispy leaves started showing some brown spots in the center of the leaves and start spreading to the tip of the leaves, drying the tips and making them crispy.
Bio bloom is a p-k booster so yes, I'm using it.
This is the soil I'm using.

Thats very helpful information

So calcium deficiency shows up as necrotic spots in the center of older and newer leaves as calcium is a immobile nutrient. In most cases its hard to be calcium deficient especially in an amended soil so I doubt that you lacking calcium, my guess is the phosphorus or potassium is locking it out and making it unavailable. If I were you I wouldn't add cal mag, the extra magnesium will further hinder the uptake of calcium in the plant. If I were you I would dial back on the pk boosters right now, do some plain waterings with ph water. In all honesty I think its top late to address this issue now. You're not too far off from harvest and this issue needs more time than you got to fix it in my personal opinion.

This problem should not effect the outcome of the finished product. Your buds look great right now, you'll have some ugly leaves but your plant wont be producing any more anyway so the problem will slowly spread to the other leaves as it ages. Keep in mind that those pk boosters aren't really necessary. Most of them are just a marketing ploy in my opinion. Never used them and my plants turn out great. A lot of pk boosters actually have PGR (plant growth regulators) in them and are labeled as pk boosters. Idk about yours. Ive never really looked at pk boosters at all before.

Its a good thing to keep in mind that when you see these necrotic spots start popping up that means that your calcium has already been locked out for some time. Everything has a balance in plants. Calcium isn't the only thing that causes spots like that its just the most common.

I had a similar problem in veg on my current grow. Had a calcium deficiency shows up right before I was ready to switch to flower. The problem was actually an imbalance, I actually had too much as my water source is loaded with it. I had to up my magnesium input to help the lock out. The reason calcium and magnesium are usually together is they both directly effect the uptake of eachother. In your case the pk boosters probably locked out both magnesium and the calcium hindering the uptake of both. Did you have very pale new growth before you started to flower, almost yellow but would green up after the leaves grew in?

 

[pimpampum]

Wow thanks a lot for your detailed answer, it really helps me understand the issues that I'm facing.
The bio bloom says that "it contains the optimum blend of nitrogen, phosphorus and potassium..." so I guess it's a p-k booster right?
So I will take your advice and do only plain waterings with controlled pH.
I think I'm around one month (maximum) away from harvest and I will check how the plants respond from now on.

Once again thanks a lot for your input

 

[Cannaficionado]

Wow thanks a lot for your detailed answer, it really helps me understand the issues that I'm facing.
The bio bloom says that "it contains the optimum blend of nitrogen, phosphorus and potassium..." so I guess it's a p-k booster right?
So I will take your advice and do only plain waterings with controlled pH.
I think I'm around one month (maximum) away from harvest and I will check how the plants respond from now on.

Once again thanks a lot for your input

I just looked it up, biobloom seems like it is not a pk booster. Just looks like a normal flowering supplement. Pk boosters are usually ridiculous high in p and k usually like a 0-60-60 yours is nowhere near that. So you may just have a minor imbalance. But like I said mine took about 3 weeks to correct in veg, so I think you will be ok till chop day.

My guess after looking it up is maybe something you are using has extra phosphorus or magnesium or even calcium. Like me, your water may have some stuff in it that you arent accounting for. Most nutrients regimens are made with the thought you are using distilled or reverse osmosis water. If you're using tap or spring water those dissolved solids need to be accounted for

 

[pimpampum]

Ah ok, I understood it. I had some prevoius grows and this is the first time that I got this problems (first time using mephisto seeds too) so I'm trying to understand and learn from it and you helped a lot!

 

[Cannaficionado]

Ah ok, I understood it. I had some prevoius grows and this is the first time that I got this problems (first time using mephisto seeds too) so I'm trying to understand and learn from it and you helped a lot!

Different plants will respond differently even if they are fed the same. My calcium deficiency showed up on 2 of the 3 plants Im growing but the 3rd never had a single problem. Plants definitely know how to throw a curve ball. Good luck. Plants look great by the way