Plant deficiency Not sure if Potassium or nitrogen

[Dontsleeptolong]

Hey guys this wonder women strain is in her 3rd week of flower and over the weekend i noticed a few of these leaves appear after I defoliated her a bit on Saturday. I am not sure if this is nitrogen or potassium deficiency. and If it is how to treat it. If I can get some input I would really appreciate it. Temps are running a high of 82F during the day and 75F during lights off, watered every three days and she is in Virago organic soil mixed with per-lite about 70/30 mix.

 

[xxstantheman420]

Im dont think it looks much like a potassium or nitrogen def but more like a calcium deficiency imo check this out:

http://growweedeasy.com/marijuana-symptoms-pictures

 

[Fresh 2 De@th]

Combination of calcium, phosphorous and potassium.

 

[Dontsleeptolong]

Combination of calcium, phosphorous and potassium.

wow what can I use to treat all three, Ive been using MG plant food along side bud candy since it has been in flower. I know MG is not ideal to use but it was what I had at the time and was cheap.

 

[Fresh 2 De@th]

Tbh, i would start by checking ph from the runoff.

 

[Dontsleeptolong]

Tbh, i would start by checking ph from the runoff.

I'm running about 6.8 on my run off

 

[MYOB]

I think its....umm....

copper!

wait. no.

manganese! yeah, thats it.

flush and add some molasses. that should do something.


seriously though.

looks like classic Ca issues. Common in flowering. What is your water source? What is the ppm/EC reading? Do your base nutrients contain Ca & Mg?

Where did you get the idea of an N/K def?

 

[Crispy Bacon]

Grab you some Cal Mag my friend!

N defic is when they turn pale(N needed to produce lack of chlorophyll, aka "chlorosis, less chlorophyll=less green)
K defic is usually has tip+margin burn, and chlorosis on older foliage.

Hope this helps ya out!

 

[Bakatare666]

Combination of calcium, phosphorous and potassium.

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[Bakatare666]

Im dont think it looks much like a potassium or nitrogen def but more like a calcium deficiency imo check this out:

http://growweedeasy.com/marijuana-symptoms-pictures

OK then tell me what is causing the light leafs, rust and colored spots.

 

[solitarygrower]

It's not Calcium (at least not alone), as that affect all new growth heavily (young leaves). New shoots almost stop growing.

 

[blackrecluse]

too much k will lock out calcium.

 

[Fresh 2 De@th]

I'm running about 6.8 on my run off

i have never grown in soil before, all i ever grew in was soilless mixes, but from what i assume, 6.8 is a lil too high. if anything, you should/would want it around 6.5.

 

[solitarygrower]

too much k will lock out calcium.

True, as shown here (lot's of interactions - but some help each other too, lockouts are not as simple as people would like to believe (and this isn't even PH-related!)):

View attachment 2926834


However, IMHO, a real lack of calcium only will show only on new growth first.

Problem is that a single problem often makes another worse, so diagnosing problems by looking at leaf-color-charts are hard (almost meaningless).

In real life, a single deficience (lack of one element only) is rare, IMHO.