Leaf yellowing & drop

[dick_turpine]

Hmm, got a defiency that might be getting out of hand.

Started on the one plant now spread to some others. Seems to be affecting lower leaves and now causing quite a few leaves to drop i figured it was a mag issue so have added calms for last couple of feeds.

Am feeding bio bizz nutes. These are cheese photos in soil about 4 weeks in flower, ph is about 7.

I do let them get quite dry before watering as don't want to overwater, could this be contributing?

Can I get the benefit of your opinions on cause / fix pls?

Will upload pics on separate post as it won't let me for some reason.

Thank you

DT

[dick_turpine]

Here are the pics:

:

[M_C]

soft or hard water?

[dick_turpine]

Soft

[M_C]

I would run with a calcium problem, but I'm unsure why...

[V8]

Same as MC says.

Do you adjust you PH before you feed? Do you know the PH of your tap water?

V8

[mpsj]

Your last pic seems to go beyond a simple deficiency. Looks like more like a nutrient burn... or possibly a lockout from overwatering/underwatering or a pH issue. What strength nutrients are you using?

[dick_turpine]

Thanks everyone, here's answers to the questions asked. I'm feeding about 1 ml per litre bio buzz grow about 1.5 ml per litre bloom have added about 0.8 ml per litre cal mag since signs started, all bio bizz products. I top dressed a small amount bat guano a few weeks ago. I don't ph before feeding as I heard so many using organic products don't bother. Note that my quantities are approx as I don't measure perfectly, I often use the bottle cap to estimate nute quantities for a 10 l watering can. I use a soil pH tester which gives me a reading about 7.

Not sure phbof tap water but can soon test and report back.

As mentioned previously, I may be underwatering a tad.

[dick_turpine]

Ph of tap water is 6.8

[dick_turpine]

Shall I just give them plain ph adjusted water next?