Nute Burn Or Potassium Or Phosphorus Def?

[Stuartddj]

This is my first grow indoors and everything is going well but of the last few days I've noticed I have yellowing and browning of the tips of some of the lower fan leaves.

My set up is 768 watt super helios pro 4 led light

10l air pots with bio bizz light soil with 20% extra perlite
Using plant magic old timer grow (5-3-3)
19/5 light schedule they're 37 days old all autos but different seeds. So they're just into there second week of flower.

I was just about to start adding old timer bloom with grow this week at 2ml/l each bloom and grow.

If you guys could help it'd be greatly appreciated

 

[LittleDabbie]

I think you may need some better pics but............ hold for a better opinion..

@Seamaiden ??

 

[Seamaiden]

Definitely need better pix to be able to say much of anything. But we also need information about environmental parameters, which would include temps, relative humidity, media being used (is it really soil, or soilless, and if soilless, what's it comprised of?), lighting, and husbandry regimen. :)

 

[Stuartddj]

After a day of reading every forum I'm now thinking nute burn which I thought was hard when using organic nutes. So tonight I've watered them with 3l of plain water ph 6.6 each and prepared some more as using tap water need to wait 24hrs. The ppm count of water was 297 so that's avg for tap water. When I checked the run off it ranged from 2200 for one to 1050 to another avg was 1500 I believe they're a bit high and you want to run around 800 (I think).

My RH is 35-60% my humidifier broke so ordered a new on temp is 24.5 - 28.7

My soil is biobizz organic lite with 20% extra perlite

I use a super Helios pro 4 led grow light 768w draw 512w on 19/5 cycle
I have a 3x1.5x2 tent with 6inch extractor and 24"filter and 5 inch fresh air fan

I'll try and get better pix tomorrow

I used plant magic old timer grow (5-3-3) at rate of 3ml litre 3/4 of bottles amount

 

[Stuartddj]

I've fully flushed them but I have a lot of red stems does this mean they are ( k) deficient

 

[jinxjj]

Sorry to hijack but how far is your light from canopy? Looks like alot of light for that small space.

 

[Seamaiden]

I've fully flushed them but I have a lot of red stems does this mean they are ( k) deficient

Not in my experience. Usually that's indicative of a P utilization issue. This is *very* common in indoor growing though and I wouldn't chase that particular symptom.

 

[Stuartddj]

Sorry to hijack but how far is your light from canopy? Looks like alot of light for that small space.

The lights about 500mm 1 3/4 ft away the space they're in is 1/3 of a 3mx1.5mx2m

 

[Stuartddj]

Not in my experience. Usually that's indicative of a P utilization issue. This is *very* common in indoor growing though and I wouldn't chase that particular symptom.

Ok just start feeding again lightly and keep an eye on the ppm run off.

Thanks