Identify Problem Please

[cybapothead]

Ok Guys Well ive got these 4 ladies in a 1.2x1.2x2 budbox started feeding them terra vega they shot up very well nice lush green bushy leaves when i flipped to 12/12 i started getting yellow leaves as i put them on terra flores there wasnt masses amount of yellow as i did expect some as they stretched from 1.3 feet to about 3 feet maybe more now i was told to feed vega while still stretching did that it seemed to help but couldnt do that forever while flowering 3 weeks into flower back onto flores and yellow leaves showing even more this time some leaves had brown tips and curling others had just dropped off and died however this was just the lower fan leaves and all the tops seem to be nice getting frosty leaves and nice looking buds showing the brown its seem to be getting worse i aint able to check the ph of these yet till i get meter pot size is 22 litres and there getting fed 4 liters with 2ml per litre of flores and 1/2ml bud xl per litre atm i increased recently from 3 litres every 2 days as pots was bone dry after 1 1/2 days not sure if increasing the dosage to 5ml per litre of flores will help this is my first grow they seemed to be doing really well until started flowering now im at a lost end please help pics provided thanks all

 

[cybapothead]

My Temps are ranging from minumum 23C to 29c ventilation seems fine is there anythign else i can feed them with as all i see is people having same issues also using canna not that im saying its just canna nutes but something is definatly lacking or missing somewhere help required and appreciated

 

[vapor]

can you show us a pic of the whole plant?
looks like yellow leaves are yellowing as per normal function of the flower process. Maybe a little heavy on the watering with the brown tips, heavy watering can lead to pythium. You could feed for a few more weeks. I like to see normal yellow as per flower function at week 4 or 5 in 8-10 weeks flowering ladies and 6-7 in my 12-16 weeks flowering ladies.

 

[cybapothead]

thanks for your reply the pots been dry so hence the up of 3 litres to 4 although im only using 3ml vega per litre not as much as the canna recommend 5ml not sure if the pics will show anything else but the rest is looking good ill send what i can and forward more if needed thanks again

 

[cybapothead]

the pics aint great i only took ones which showed close up the problem and also the height i will take more tomorrow and show as its bedtime for them now there is lots of bud growth on them so what u recommend is less watering of less often to help with the brown leaves ?

 

[vapor]

I want to see whole plant because i can tell if it is normal bud formation making the bottom yellow. Or if it is over watering making them yellow. I say you are good and it is normal yellowing from flowering. feed a few more weeks and then just water and let the plant yellow out till done peace.

 

[RetroGrow]

They look O.K. What is the medium?
Also, get a PH meter. This is necessary, or at least get the drops to check your PH.