Anyone know whats wrong

[Ċikku]

Im growing a cbd crack from fast buds
Shes at 7 weeks but she started yellowing and drying up
Ive been told ahe has nitrogen defecincy so I fed her a 25-10-5 base nutrient but it didnt deem to efffect her

 

[Herb & Suds]

Roasted it with too much fertilizer and probably missed a water cycle or two is my guess
That much nitrogen is never used in flower
I would flush and feed with a light nutrient solution

 

[Hollatchaboy]

Way to much N. The yellow leaves won't turn green again. Focus on the new growth.

 

[Ċikku]

Do you think I should give a bloom nutrient or something like a 10-10-10 after the flush ?

 

[Herb & Suds]

Do you think I should give a bloom nutrient or something like a 10-10-10 after the flush ?

No
I don’t consider 10-10-10 bloom nutrients for weed maybe flowers

 

[Hollatchaboy]

4-4-4 may be better?

 

[crimsonecho]

10-10-10 and 4-4-4 are the same man

 

[Hollatchaboy]

10-10-10 and 4-4-4 are the same man

Right, I get that, but not as high concentration per dose.

 

[Killaki]

4-4-4 may be better?

Try more like 0/4/4 or 0/4/2

 

[hotrodharley]

First, don’t flush. Just plain water once. What nutes are you using?

 

[Ċikku]

think ill just give her a basic bloom nutrient after the flush

what I dint know is when should I feed after the flush ?
Directly after or should I wait for the soil to dry

 

[Ċikku]

First, don’t flush. Just plain water once. What nutes are you using?

An organic bloom 3-2-5 and I recently fed once with a 25-10-5

 

[Killaki]

think ill just give her a basic bloom nutrient after the flush

what I dint know is when should I feed after the flush ?
Directly after or should I wait for the soil to dry

I would only flush if there was a buildup of nutrients in the medium. If that's not the case I would probably just give it straight water but this too is only if it's called for.
pH can make a difference here and while soil usually provides a buffer, a soil with pH well outside the desired range can cause nutrient uptake issues and this displays just like a deficiency. This is just one example, unfortunately without more info on what happened and how you got here it makes it hard to determine.
All sorts of things can cause yellowing but I can tell you it is something to do with something happening in the root zone because of the location of the yellowing. It's probably not light burn. Personally I start with logical small changes and work from there but I also know all my info.

 

[hotrodharley]

An organic bloom 3-2-5 and I recently fed once with a 25-10-5

Never use the 25 again. Not on cannabis.

 

[Ċikku]

I would only flush if there was a buildup of nutrients in the medium. If that's not the case I would probably just give it straight water but this too is only if it's called for.
pH can make a difference here and while soil usually provides a buffer, a soil with pH well outside the desired range can cause nutrient uptake issues and this displays just like a deficiency. This is just one example, unfortunately without more info on what happened and how you got here it makes it hard to determine.
All sorts of things can cause yellowing but I can tell you it is something to do with something happening in the root zone because of the location of the yellowing. It's probably not light burn. Personally I start with logical small changes and work from there but I also know all my info.

Honestly its my first grow and I fucked up from the beginning
Im using a pre fertilised soil so I didnt know when/how much I needed to feed

 

[Ċikku]

Never use the 25 again. Not on cannabis.

Ended up with nitrogen toxisity on my other 2 plants but they look much better
This one just continued to get worse

 

[Hollatchaboy]

Try more like 0/4/4 or 0/4/2

Yes, at this point, cut the nitrogen. I meant to begin with.

 

[durbanpoisoner]

Right, I get that, but not as high concentration per dose.

Not well enough clearly. You can use whatever strength you want, what you need to keep in mind is the EC of the solution before you use it.

 

[crimsonecho]

Not well enough clearly. You can use whatever strength you want, what you need to keep in mind is the EC of the solution before you use it.

basically half strength or diluted 2 times would be 5-5-5. well not quite because that 10-10-10 is the percentage of npk in the salt form right? i’m not a salts guy. so if you dilute it 2x it would be as if you were giving a full dose of 5-5-5 ferts.

oh god checking ec and ph is my nightmare. especially maintaining ec and ph pens. one of the many reasons i do organics

 

[durbanpoisoner]

Organics has its own set of challenges. Soil can’t hold a candle to the growth rate of soilless either.

The NPK ratio just gives you volume. No issue using highly concentrated nutes. Hell, you could use just 20-10-20 the entire grow and be fine. All this shit breaks down the same whether you’re using synthetics or organics.

Also EC/ppm pens don’t really go out of calibration so not sure what your point is. PH pens do though.