first grow help needed please

hi this is my first grow and i have got a few brown leaves on one plant

i am using a amazon aerponic system and all has gone well so far
it is the 8 pot system

28 days in 12/12

ph 5.7
ppm 1300

just finished big bud and added pk13/14 yesterday
any help what it is would be great

TBH I'm looking through my bible and couldn't match anything to these symptomes. If you're in flowering then rest assured leaves are supposed to turn yellowish at the later stages when buds take up most of the plant juice.

I just want to metion that I am no expert, just a guy trying to help.

Thanks for the reply
does anybody else av any input just incase its a problem

Can we have a little more info....strain...... full nutes used.....
Personally I wouldn't have used big bud AND pk13/14, either would work fine on there own. Could be slight over feeding due to 2 many additives.
Leaves can discolour as plant progresses through flowering as the plant uses up it stored energy/nutes in the larger leaves.
Monitor if discoloration increases rapidily ...flush and refill nutes with fresh. If slow progress then it's more than likely natural relocation of nutes within the plant.
you say your PH is 5.7 .. is this monitored every day and adjusted too. try not adjusting the nutes as reg ....fluctuation is always good in hydro.

hi mate
strain is chronic x bubblegum clone
rez is 60 lt
food mixed in a 80 lt bin
canna aqua flores a&b
big bud week 2 75ml,week 3 150ml ,week 4 150ml
week 5 started yesterday and big bud was stopped and pk13/14 added 120ml
ph only gets adjusted on rez change and usually rises about .5 the next day so is brought down to
5.7 and usualy stays there till next change a week later

dont think its over feed as ppm is 1300 and a&b still not full strength
they have been like that for about 4-5 days and not got worse or better

anyone have any answers please

28 days.....Hmmmm if it aint getting worse don't panic could be simple relocation of nutes within plant due to flowering. It does look like slight overfeeding (same as i get on LSD... no mater how much i drop ec.)
Ph 5.7... adjusted.... you say you bring ph down about 0.5 which would put your nutes before adjusting @ 6.2..... as your using CANNA Aqua .......
read up on Canna aqua..... once nute tank ph set at start....... i set @5.5 as i rises.......... you DO NOT need to adjust again it will always say within 5.2 and 6.2 that is how canna aqua is designed. Even if it hits 6.3 it will lower itself, you DON'T need to add ph up or down after first setting. Too much up or down can cause root issues. This aint your problem as I don't think you have one, it's just a tip.
I use the full Canna range... have for 16 yrs...can't be beat and I've tried em all. Expensive .... but Quality shows.
I do think big bud or PK should be used on it's own, and not together.... and canna nutes Don't like other additives added other than CANNA products .. this can lock nutes out as they are NOT designed to work together. If you go to the Canna site and sign up you'll find loads iof useful info... FARRRRRRRRRRRRRRR more than any other nute producer.... but they have invested MILLIONS more $$$ into research than any other company.

Good Luck.. looks like your have a nice crop if things go according to plan.

It almost looks like a Ca problem. This is common if you are using RO or distilled water. Page 24 of the Garden Savers Handbook has a plant with the rust looking spots just like your plant. It can be treated with a foliar feeding. Add 1 tsp of garden lime per quart of water.

thanks fr all the advice hillcrest
i didnt know that about canna aqua
i also dont think its a root prob as they all look very healthy
as this is my first grow im just a noob lol

Serapis said:

It almost looks like a Ca problem. This is common if you are using RO or distilled water. Page 24 of the Garden Savers Handbook has a plant with the rust looking spots just like your plant. It can be treated with a foliar feeding. Add 1 tsp of garden lime per quart of water.

Click to expand...

Ca has been considered also
but im using tap water

https://www.rollitup.org/hydroponics-aeroponics/380763-first-ever-grow-aero-28-a.html

some more pics and info