From

Location

Message

Date Posted

Grittyville, WA

That cant be an iron deficiency, its gotta be magnesium....? Magnesium is a mobile nutrient and it will literally drain out of the plant under certain conditions? Someone correct me if I am wrong please... thx.

5/22/2024 6:07:57 PM

Grittyville, WA

It has to do with transporting sugars. Theoretically, you'd see yellow where the transport of sugars down into the roots stripped all the magnesium out of the leaf. I believe thats why the odd mottling affect happens??

5/22/2024 6:12:49 PM

New Castle, Indiana

My soil test said my Mag was very high, so I'm not sure how it could be deficient. I've had others suggest that the effect on the younger leaves could actually be the result of spray drift from the field or Mag toxicity, maybe from the insecticides?

5/22/2024 11:50:40 PM

Grittyville, WA

I think, as an analogy, its a situation where you can have a good paying job but still go broke if you get hit with extra expenses. The plant gets hit with a perfect combo of low transpiration (leaves wet all day), excess water around the roots (which dilutes the minerals going into the xylem), and high sugar production and movement, adding all of this together it just gets temporarily overdrawn with regard to magnesium. "Credit card denied" mode. I dont think I've ever seen this happen on a plant that was covered & dry.

But there's a lot I dont know, so...

5/23/2024 2:58:02 AM