Is this calcium deficiency or nute burn?

[justice8965]

Hey all. This seedling is about 5 days old, in coco. Noticed these yellow spots and dark spots around the leaf tips. This is the only one of my 4 seedlings with this issue. I started a foliar spray with cal mag, but I wanted to get some opinions from those who are more experienced. Does this look like calcium def to you guys, or nute burn? Here's my notes on her feeds so far by day (In EC, In PH, Out EC, Out PH)

450​

6.1​

460​

6.3​

475​

6.2​

634​

6.3​

489​

6.2​

634​

6.3​

540​

6.4​

614​

6.4​

585​

6.2​

634​

6.3​

 

[BobThe420Builder]

Watering/feeding daily with 1/4 strength nutes?

pH of feed mixture?

 

[justice8965]

Watering/feeding daily with 1/4 strength nutes?

pH of feed mixture?

Feeding daily, PH and EC is in the post, but PH averages around 6.2. Here's the nute mix I'm using, diluted with distilled water to reach target EC (amounts per gallon)

CalMag............................................	5.0
Flora micro......................................	1.25
Flora gro.........................................	0.6
Flora bloom.....................................	0.6

 

[BobThe420Builder]

pH in Coco is 5.6-6, so yer a bit high

I use GH Flora Trio in DWC, not sure on ec, I never go by it myself. I go by recommend strength from the feed schedule

Now you say amount per gallon, are those ml or ec??????

 

[justice8965]

Those amounts are ML. The actual EC of the feed is in the first post. I also noticed the tips of the leaves are starting to turn up a bit, which would indicate nute burn, correct?

 

[CannaCountry]

Stop foliar feeding the plant...make it get it's feed / water from the coco. As noted, your pH is a little high; 5.8 is your sweet spot. I'm not one to check my run off, but being that you are, be sure your disparities between In and Out don't continue on your trend.

 

[justice8965]

Stop foliar feeding the plant...make it get it's feed / water from the coco. As noted, your pH is a little high; 5.8 is your sweet spot. I'm not one to check my run off, but being that you are, be sure your disparities between In and Out don't continue on your trend.

Ok, I'll lower the PH going forward. Should I flush with some PHed distilled water for now?

 

[CannaCountry]

Ok, I'll lower the PH going forward. Should I flush with some PHed distilled water for now?

NOOO....you don't flush a coco grow. If you want to lower the pH...mix up a new batch of feed and be sure the pH is where you want it. Then feed your plants so you get plenty of run off, and by doing so you'll have essentially reset your medium...but never flush or use plain water...if you're going to grow in coco.

 

[DCcan]

You can mist the foliage with tap water just to dilute/ rinse off what you put on, but what he said, no flushing especially with distilled water.
Keep the calmag in the coco where its needed.

 

[justice8965]

Alright understood. Last feed was 585 EC. I'm going to mix up a batch of feed at around 450 EC with a PH around 5.8 and give her a big flush. I'm leaning toward this being a nute burn issue due to the colors and the slight curling up of the tips, so hopefully this will help

 

[justice8965]

Ok flush done. In EC - 437, In PH - 5.9. Out EC - 491 (down from 634 this morning), Out PH - 6.2.

PH out is still a little high. I'll keep feeding at 5.8 or so to hopefully bring that down

 

[CannaCountry]

Be mindful not to dampen off the plant with all the moisture...in other words, when they're that small, a daily feed isn't absolutely necessary, as long as the coco is still moist and holding water weight; it's a baby.

 

[justice8965]

I've got plenty of perlite in there so it only ever stays moist, not overly wet

 

[DCcan]

PH out is still a little high. I'll keep feeding at 5.8 or so to hopefully bring that down

EC out is what to watch. like 800 in/1800 out.

Ph out is pointless since you just flushed it out with 5.8+- solution

 

[justice8965]

EC out is what to watch. like 800 in/1800 out.

Ph out is pointless since you just flushed it out with 5.8+- solution

Going to keep her around 500 in and out for a couple days to make sure I'm not overfeeding. Her 2 day older sister has been getting fed at higher nutes than her and is booming. Same strain, wonder why she takes better to it.