Nutrient burn or deficiency?

Hello, this is my first post here, and I'm looking for help.


Right now I'm on week 4 of flowering, this is a blackberry.
From what I searched online this plant might have a nutrient burn or a deficiency.

I'm using organic soil that i bought and I'm feeding them once a week with a product that I bought with the soil. I'm not from USA or any English based country so I will try to translate the product description.

0-0-50
Class A Compound Organic Fertilizer. Physical Nature Water-Soluble Powder.
Total Organic Carbon (TOC) = 6%.
Potassium (K2S04): 50%.
Sulfur (S): 15%.
Magnesium (Mg): 6%.
Calcium (Ca): 3%.

Other ingredients:
Humic Extracts, B-Complex Vitamins and 15 L-chain Amino Acids.


I'm watering she every 2 days.
My ph is usually around 6.5-7.
The temperature in the tent is around 23-28ºC (73,4 - 82,4ºF)
The umidity is around 40-55%.

Too much potassium from that 0-0-50 fertilizer.

You need a more balanced fertilizer. 5,5 ,10 or similar.The numbers represents the percentages of each element.

Funny how a potassium toxicity can look similar to a deficiency?

Do you guys think this a potassium toxicity?
From now what do I do? Just add water every 2 days?

Can you get some Earth Worm Castings? Put a few cups of that on top and water it in.

May need to flush with neutral PH water and spread out watering a little. Every 2 days may be too much, when watering try to not water near stem but water where soil meets container wall. I'd also look at switching to a bloom fertilizer and apply at 1/2 strength every other water working up to full strength per manufacturers instructions.

kidimanjaro said:

Do you guys think this a potassium toxicity?
From now what do I do? Just add water every 2 days?

Click to expand...

Yes possible potassium toxicity from fertilizer and maybe over watering. I'd look at watering 3-4 days for a couple weeks, when leaves directly under buds (not sugar leaves) droop is a good indication to water

Thanks so much for the replies.
I'm already looking for a more balanced fertilizer to use, right now I'll be using some worm castings.
I'll be watering every 3-4 days and see how she goes.

Here at home i have 2 fertilizer, both claim to be "organic". One is 3-2-3 and the other is a 0-15-8, can i use this right now?

And this one that is 0-0-50, do you guy think there is a stage i can use?

Again, tnx a lot

Read the first post in this thread.https://www.rollitup.org/t/something-people-ought-to-know.501568/

myke said:

Read the first post in this thread.https://www.rollitup.org/t/something-people-ought-to-know.501568/

Click to expand...

Great information, thanks myke

kidimanjaro said:

Thanks so much for the replies.
I'm already looking for a more balanced fertilizer to use, right now I'll be using some worm castings.
I'll be watering every 3-4 days and see how she goes.

Here at home i have 2 fertilizer, both claim to be "organic". One is 3-2-3 and the other is a 0-15-8, can i use this right now?

And this one that is 0-0-50, do you guy think there is a stage i can use?

Again, tnx a lot

Click to expand...

The two fertilizers you have at home may be of use if they are in a liquid form. I'd look at the possibility of using the 3-2-3 during the plants veg state and switch to the 0-15-8 during flower. I'd use them at 1/2 strength every other watering.

Your 0-0-50 fertilizer is for potassium low soils. If you use a reputable organic soil in the beginning it should already be balanced with the 3 primary nutrients so that fertilizer should not be needed.