HELP! Leaf marks nutrient burn or deficiency?

[Alik92]

Hello everyone!
Tomorrow is the last day of the 4th week of flower for my white widow and yesterday i noticed some new purple/brown marks on the leaves of my plant.. I dont know what it is, internet is making me confuse, and before i do something wrong i thought i'd ask you guys what you think..

The marks came the day after i rushed watering, i had to leave and the pot was kinda dry, so i gave it a smal portion of ph'ed water.. Didnt even gave enough water to get a runoff. The next day i saw the marks and fed the plant with GHE flora series and Grotek monter bloom at 1.5EC.

Today it got a little worse..

If anyone can give a suggestion, i would appreciate it!
I am sorry about the lights in the photos, i tryed outside of the tent and they were even worse... I need to buy a new cell phone.
Any info you need just ask!

[3Berries]

You adding Ca and Mg?

[Alik92]

No, i was told my flora micro had enought micro nutrients.. And we have a good tap water in my city, well treated, it comes at 0.6 to 0.7 EC (they called it hard tap water)..

I do grow with led light, should i start mixing some calmag?

[3Berries]

If you want to maximize the plant it needs calcium to do anything. My biggest problem when smaller was they never used up any water, even when bigger it was only once a week for watering. As soon as I started adding the Ca directly that changed and the plant started growing like a weed, two nodes a day and water every three days even when adding 3/4 cup a day of liquid.

If the tips start to turn and I don't add Ca then the whole leaf starts yellowing between the margins and veins and never recovers. <<<<I always thought this was nute burn.

I am at a high COs and light level. But the LED 'bleaching' does not occur now, just canoeing if they are too close or near the end of the day. Humidity too is much better as none is needed to be added. The plant is breathing quite well.

[golfnrl]

If your tap water is .06-.07 EC and your target EC is 1.5 that doesn't leave much room for 'stuff' in the water. Has that EC been your target for the whole grow? What is your grow medium? Coco and Perlite? Looks like soil but hard to tell from the pics. What was your PH the last time you watered?

This might help as well. https://www.growweedeasy.com/common-nutrient-problems

[3Berries]

As far as the nute burn tips and Ca uptake my thoughts.

Is it indeed nute burn or starvation? Due to the lack of Ca it can't move nutrients and build more plant tissue? It seems the affected leaf never recovers and just stops growing, slowly giving up what it's got.

So far I have seen no sign of too much Ca.

[bboyfromwayback]

Looks like the start of lockout to me. I would try flushing it good then water with proper nutes and ph. White Widow is a finicky strain. She’s picky about her ph

https://www.growweedeasy.com/flushing-sick-cannabis

[Alik92]

Hi! thanks for the input..
I grow in soil, 10L pot.. Using led lights (Marshydro ts1000, its a micro grow)..

They do drink some water, i have been giving them 2L mix every 2 to 3 days (at the 3rd day the pot is really dry, atleast i feel like it..), sometimes i dont get runoff so i give another 2L.. i like to get atleast 500ml runoff..

I have some doubts about the flushing process (what am i supposed to do..), my understanding is that i should water with the desired nutrient mix until i get atleast 60% runoff... Sometimes i water until i get a runoff EC close to the one i am giving them.. should i water without nutrients in a flush? should i use more water?

I try to ph to 6.0 to 6.5, i use a ph pen and it reads 6.2, but i dont trust it very much so i use an aquarium test kit (one of those that you have to use some liquid drops and check the color) to double check..

Its funny, i tryed to search the web for symptoms like mines, if i didnt ask you i would be think it was Phosphorus/molybdenum or cooper deficiency.. In another words, i would probably mess up my feedings even more..


Edit:
Hey guys, could i be overwatering? https://www.growweedeasy.com/5-surpr...ering-cannabis

[Rwise]

During the flower stage raise the PH to 6.5-6.8 range for better uptake.

[Alik92]

Lol finally realised i could answer people directly..
I do believe i have been overwatering a little the last week or so, ph is probably a issue too. What would you do in this case?
I was thinking about letting it dry first to avoid any rot issues, and then watter with an higher ph (6.4/6.5), read the runoff and act based on it.
Wont be giving any nutrients since i have doubts on overwatering.

[OldManGrower]

Add Cal Mag at full strength ASAP. You have to work at it to add too much calcium. Add additional cal mag every watering at 1/2 strength.

[Rwise]

Learn to lift the pots to see when they need water, Calmag wont hurt.

[Alik92]

Hello guys! thank you all for the help..
Adding calmag did it, brown stripes and edges are starting to turn green again!
I reduced my water quantity just in case..

Thanks for the help again!
Will save this on my notes eheh