Yellow Seedlings on Days 19 and 15

[Rufus.Gray]

Problem: seedlings are turning yellow. On the plant next to the meter, there seem to be brown spots forming on the newer leaves.

Medium/grow method: Royal Gold Mendo Mix

Feed: and supplements used: none

water source: Arrowhead Spring Water ph down to 6.4 using citric acid crystals

Strain/age: FastBuds Blue’Dreamatic (triploid) on day 15 and Monster Genetics Bruce Banner on day 19

light used: 3500k autocobs x 3 x 24 hrs
Climate: 78-81F; 65% rh

Additional info: Saw 1 gnat earlier, shook the pots a little bit and didn’t see anymore fly up. I sprayed the plants with neem oil 3 days ago. Humidity has been fluctuating a bit in the tent over the past few days, flaring up to 71% while I’m at work. I also have a day 8 Tangie’matic from FastBuds in the same soil and tent, but she seems ok at the moment.

 

[Arthur]

Your under good LED lighting, cal/mg is a necessity. some genetics will demand more or less than others. Get some cal/mg and get it in.
Maybe foliar with Epsom...

 

[Rufus.Gray]

Your under good LED lighting, cal/mg is a necessity. some genetics will demand more or less than others. Get some cal/mg and get it in.
Maybe foliar with Epsom...

I have cal/mg, but I just watered yesterday. Is that ok?

 

[Rufus.Gray]

I put 0.5 tsp of calmag into a gallon of water and gave them about 0.5L each. Fingers crossed.

 

[Arthur]

I put 0.5 tsp of calmag into a gallon of water and gave them about 0.5L each. Fingers crossed.

Pretty usual... you'll have to work out the amount that works with your water source. Strains vary, but you'll get used to reading what the plant wants.

 

[Rufus.Gray]

Pretty usual... you'll have to work out the amount that works with your water source. Strains vary, but you'll get used to reading what the plant wants.

It looks as though the calmag did the trick. I’m going to do a foliar spray with epsom salt before lights out tonight.

 

[Waira]

they need food ASAP mate, that over-all pale color, small size are the clues,... Mendo Mix is good stuff, but it's mainly coco, not a true, nutrient balanced soil... pH should be run near 6.0+ as well, Ca-Mg you're doing already- ...I've been using their King's Mix, a true soil, and love it! Less bitchy than coco+simple supplements, more flexible and a bit richer...