Leaves yellowing then getting brown and falling off

Hi there,

I've got a couple of plants under 12/12 cycle, they have been flowering for around 15 days and all the lower leaves are falling off.

First they get yellow, then they darken getting like brown, dry, and they fall with the smallest touch.

I water with ph'd water and usually i leave the water seat for a day or longer, temps are alright, sometimes goes a bit up to 82 but most of the time is around 77, at night goes down to around 68.

The humidity is between 40-55% difference between day and night. And the pots are 3L pots, I know they aren't very big but the box ain't either, i've got then under 150W HPS.

Could it be lack of nutrients ?

Here are some pics of the leaves.

What are you feeding them?

If I would take a guess right now I'd say add some Cal/Mag. I use Botanicare. It also have Fe (Iron). I'm very happy with the results. Depending on the color of your mid to upper growth I might give them a nitrogen boost to. Last but not least if neither of those work I would try some Phosphorous (the P in NPK).

Thanks curious,

I already game them like 4ml/L of biogrow last watering at it didn't help at all. I was thinking about giving them about 4ml/L of bio-bloom to see if it helps, can't really think of any other reason but the nutrients.

May try to add some atami bust first, it's meant to have micro-nutrients.

I was reading about the deficiencies and sound like it could be Phosphorus def. The only thing that doesn't match is that the leaves aren't purple/dark green but instead they are yellow. But I just found this:

Some plant species and varieties respond to phosphate deficiency by yellowing instead of purpling.

Click to expand...

I think I'll water with 4-5ml/L of bio-bloom and lets see if they like it