Indoor Whats up with my girls? Autos

[SouFou]

Hey,

Note this happened literally a day after they went into flower and they were on just plain water.
These girls have been in batmix all their lives, and when they flipped to flower last week, only then some slight yellowing at the edges of the leaves have started to appear.
They are all on the same feed in the same conditions, Light is 24 hours and 24" away. When I saw pistols appear I gave them their last watering of plain water before I started on the Biobizz fishmix and bloom. It's been about 1 week since flowering started and they are currently on days 34 and 36. I started them on 1ml of fish
mix&bloom as per the feed chart and recently upped it to 1ml&2ml just yesterday. Here's a recent picture I have just taken.

Deez nugs - Day 34
FC x Forum -Day 36

 

[Not-a-cop]

Are you measuring and controlling the pH and EC of your feed?

 

[SouFou]

Are you measuring and controlling the pH and EC of your feed?

No I'm not, should I be? I'm in soil. My water is P.h 6.5. According to the manufacturer there is some self regulating PH stuff in the soil. They have been watered until run off almost always with just plain water so I doubt there's any build up of nutes. I started growing in soil to get rid of the PH and EC meters to be honest.

 

[Groff]

Are you measuring and controlling the pH and EC of your feed?

No EC since its Biobizz, so pure organic. pH is important. Though from these pics, I'd say it is normal "aggressive growth yellow tip" for now. Does not seem like burn just yet to me.I'm on day 43 an giving them 4ml/L, though I dont use Bloom, only fishmix. Bloom can burn, I dont think Fishmixcould ever burn at such low dosage.

pH 6.5 and you're golden.

To me they look fine, some strains are so aggressive growing the tips may be yellow really close to nute burn.
_

 

[Waira]

thanks Groff! ........ yellow tips are pretty generic as a symptom usually, several things can cause it.. but here it's glaringly biaed toward the tops/newest growth, so something is boderline there.... Also, I recommend going to 20/4, i see definite light stress signs on upper leaves, and the tips may be linked to this indirectly as well... there's a great thread on this in MythBusters, 24/0 vs 20/4... Basically, blasting with 24/0 light isn't going to yield you mush more if anything, too many other limiting factors in play before light fits into the equation... Look up Maximum Daylight Integral; there is only so much photonic energy the plant can use in a day, and powerful lights on 24/7 full cycles can easily overdo this, to the detriment of things, not to the benefit... riding the photosynthetic machinery into the red isn't a plus! That curling is a response of the plant trying to lessen the directness of the light striking the leaf surface, so is the so called "praying to the light" posture...
The vast majority of opinions I see on 24/0 see rapidly diminishing returns beyond 18/6, and since energy isn't free, nor is the wear&tear on the lights, unless you have you gig dialed in like a Master, CO2 included, odds are 24/0 is a waste of time, $, resources....