PK boosters early in flower causing MG lockout

Is there any downside to giving a mild dose of PK boosters? I heard too much P early in flower can lockout magnesium?

Potassium toxicity can lead to cal,mag,zinc,iron deficiencies. The first two weeks the flower is stretching and will still need veg nutes. Or at least that's what everyone has told me.

I use canna pk 13/14 from end of week 3 at 0.5ml per litre and stop using it 1week before I start flushing. Works perfectly fine at those rates. They might take more but I'm a light feeder. Say I'm feeding bloom at and ec 1.4, when I use the pk I add it first to the water till it reaches ec 0.5 and then top up to ec1.4 total. Background tap water here is 0.2.

Aolelon said:

Potassium toxicity can lead to cal,mag,zinc,iron deficiencies. The first two weeks the flower is stretching and will still need veg nutes. Or at least that's what everyone has told me.

Click to expand...

I usually start before

Aolelon said:

Potassium toxicity can lead to cal,mag,zinc,iron deficiencies. The first two weeks the flower is stretching and will still need veg nutes. Or at least that's what everyone has told me.

Click to expand...

i feel like I’ve got a mag lockout due to me adding PK boosters this past week. I’ve used them at mild doses at the start of week 3 now I’m in week 4 and I’m seeing a really bad mag deficiency and it’s spreading and not going away even tho I’m adding cal mag