Yellowing. Deficiency?

but GO BLUE!!!!!!!!!!

Mellodrama said:

Squid, are you sure that's what you wanted to write? I borrowed this from Michigan State University Extension:

"Once inside plants, nutrients are transported to where they are needed, typically to growing points. Once incorporated by the plant, some elements can be immobile while others can be remobilized. Immobile elements essentially get locked in place and that is where they stay. Those that can be remobilized can leave their original location and move to areas of greater demand. Knowing which are mobile or immobile is helpful in diagnosing deficiency symptoms.

Since immobile elements do not easily move within the plant, when deficiency symptoms occur they show up in new growth (Photo 1). When mobile elements become limiting, they can be scavenged from older growth and moved to where they are most needed, causing deficiency symptoms in older growth"

As you said, N is mobile, but that means the plant can take it from old leaves and move it to the new growth. Mobile goes up. AFAIK a mobile element never goes down, because a plant will always prioritize new growth over old.

I'm pretty sure you understand mobility, I just wanted to point it out so someone doesn't get confused.

Click to expand...

You are correct, I worded what I was saying funny. It doesn't always start at the bottom most leaves, nitorgen is mobile so it will suck it out of any part of the plant starting with older growth and working its way up but not always.

It doesn't work its way down, my bad.

It can suck from the middle of your plant and i've seen nitrogen make the top half of plants a slightly lighter shade of green way before bottom leaves start yellowing.

The N deficiency is pretty late stage when your plant is 'cannabilizing' lower leaves and working it's way up the plant.

Hey, no problem. I've been trying to memorize mobility vs. immobility and which elements do what. I still get it backwards in my head sometimes. "Wait, wait, the element goes up, so the problem is down. Or is it the other way around?"