Phosphorus?

[Overthinkergrower93]

Problem: Leafs have what looks like dirt marks? Started about 2weeks ago, i think after using calmag the ONCE but stopped using after seeing this.

Medium/grow method: biobizz light mix 3gal fabric pot

Feed: and supplements used: 3ml grow/4ml bloom/2ml top max/2ml algamic per ltr every 3days. She gets 2ltr

water source: tap water, hardness- mod.soft calcium is about 28.4 mg.

Strain/age:Alienvstriangle (mephisto) day 55

light used: 400w hps about 23" away.

Climate: lights on 25c lights off 18c (has reached 15c) RH 30ish% can climb to 45% lights off.

Additional info: ive been advised it could possibly be phosphorus but woud like confirmation from the docs. Been told PK 13/14 may help so that arrived today but wont use until ive had more clarification on it. I have 2 plants both get fed the same BUT only this happened on the 1 girl (only gave her the calmag*) if pk 13/14 would help do i just add it to the other nutes especially the bloom? Thankyou!!!

 

[namvet25]

Are you ph'ing your water?Cal/mag would not cause this so continue using at least 1tsp per gallon at every feed and make sure you fully water entire plant until you have runoff out the bottom of the pot.What is the recommended dose of the PK you have>

 

[Overthinkergrower93]

Are you ph'ing your water?Cal/mag would not cause this so continue using at least 1tsp per gallon at every feed and make sure you fully water entire plant until you have runoff out the bottom of the pot.What is the recommended dose of the PK you have>

I phd at the beginning but was advised i didnt need to with biobizz products.. so havent past 3weeks, pk dosage recommendation is 15ml per 10lt

 

[namvet25]

I phd at the beginning but was advised i didnt need to with biobizz products.. so havent past 3weeks, pk dosage recommendation is 15ml per 10lt

I would keep on using cal/mag and start your pk product but being that strong I would go half dose at first.

 

[Overthinkergrower93]

I would keep on using cal/mag and start your pk product but being that strong I would go half dose at first.

Appreciate that thankyou.. just fed her (per ltr) 3.5ml bloom/ 3ml grow/2ml topmax/ 1ml calmag/ 1ml pk 13/14.. gave her 2lt in total.. fingers crossed! Thankyoi for the reply. Ph was 6.2

 

[Waira]

-- yup, P dec. for sure! I see Ca defc. too,...

 

[bakEQuatorial]

-- yup, P dec. for sure! I see Ca defc. too,...

Waira, which part shows P deficiency? I would love to learn how to spot them. Pretty pls?


Sent from my iPhone using Tapatalk

 

[Rudra]

Waira, which part shows P deficiency? I would love to learn how to spot them. Pretty pls?


Sent from my iPhone using Tapatalk

Photo 3 for example shows P def on that yellow leaf with big brown spots...

 

[Overthinkergrower93]

Well she got a nice dose of bloom with 1ml per lt (2lt) of pk and 2ml of calmag, thanks guy hope she heals... 1st grow so still learning!

 

[Waira]

@Equatorial -- sure mate! Large necrotic patches are usually P defc., usually mid-low leaves, but can hit higher up even though it's a mobile nute (within the plant),.. that yellowing is a common co-symptom I see,... Finer more scattered spotting , mid-to-high is Ca defc., as it's immobile (little to no translocation from established tissue to new growth where it's needed more),... BUt these two can have definite overlapping symptoms, and certainly can occur at the same time, muddying the diagnostic waters,... lower leaf color face is also normal at this stage and other mobile nutes are taken, N in particular,...

>>> OTG, it's wait and see for a few days as those nutes get taken up and metabolized,....