Day 17 and my bcn critical xxl is going yellow

[Newbiegee13]

Day 17 and my bcn critical xxl is going yellow on the tips of some of the leaves and spreading.
I thought maybe too much nutes so I flushed them 3 days ago but still the same.
They're auto flower

[M_C]

Hi mate, not much to go on there... fill this in, it should help us

Soil or hydro or coco:

Strain:

Photo or Auto:

plant age:

pot size:

has it been repotted? and when?:

soil type:

nutes or additives used and how often for soil:

Air temps (max min):

Res temps (max min):

humidity:

lighting type and wattage (hps, led, cfl):

Light schedule:

ph level:

EC (hydro and coco only)

Background EC.

feed schedule and nutes (for hydro and coco)

anything else you think may be relevant!

[Newbiegee13]

Coco
Bcn critical xxl
Auto
18 days old
12litre pot fabric
70% coco 30% perlite
Flora triple series with cal mag
Not been repotted
Air max 28 min 22
Res max 22 min 20
70-80% humidity
I have a 600w hps with ballast turned down to 250w
18-6 light schedule
Ph between 5.5-6.1
F.. . ..

[Jingo]

Soaking those pots each and every time you water, wet enough to where it's running down the outside to the pots and giving you at least 20% runoff. You may be getting good run off but not soaking the pots and you really need to soak those pots.

With no background EC to deal with in my grow room, I would be feeding four mil grow two mil micro and one mil bloom per gallon of water. I probably wouldn't do more than half mil calcium at this stage of growth. you may live somewhere where that feed will put you over your total EC and you'll have to make adjustments.

I would not go below 5.8 pH at any time, and I would put the upper limit of drift at right around 6.2 to 6.3. stay in those ranges and let them drift back and forth and you'll be fine. You would be absolutely amazed at how much 0.3 change in pH can affect nutrient uptake especially when you go below 5.8 you start missing a lot of calcium.

My 2020 outdoor grow autos and photos in pots

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