What nutrients cause this?

[kfos]

Check this out guys. Crown royal from crop king. Yellowing and rusty color on just one plant

 

[Holisticfarmer]

could b anything! Whats the rest of the plant look like?

 

[kenobi]

Agreed, more details! Although from that it could be calmg def or k? There's a guide online that gives you all the stages of def in plants and tells yoi how to reverse it.

 

[kfos]

Ok hey this system has 4 different strains it's in week 8 of flower now. 150 l hydroponic system with 20 plants in it. Using reverse osmosis water. Using flora series 3 part. Fist two pics are crown royale 9 week strain.
Third pic is white widow. 8 week strain dine this week. I think it may be cal mag. I am So close don't wanna fuck this up dudes

 

[covert222]

Well those look like they're over watered and have too much nitrogen but your discoloration could still be a rust fungus

 

[billy4479]

I agree they do look over watered , this could all be a sign of root stress , from low oxygen environment in the roots , allow longer times between irrigation

 

[MeJuana]

That leaf looks like the plant is taking it back.. It will dry up and fall off. If it is a lot of leafs then worry otherwise that ia normal..

The guys warned you on the watering. Your roots need air man

 

[Cyrus420]

Rust colored spots on leaves is a good indication of a calcium deficiency.

 

[Urbz]

N toxicity. Rust color spots could be nute burn.

 

[kfos]

Ok I think my res is too full. Should 50% of the roots be exposed? Also just figured out I did not add any cal.mag. and I use r.o water. I am on 10 min off 1.5 min on. Should I go 15 off 2 on?

 

[kfos]

Well those look like they're over watered and have too much nitrogen but your discoloration could still be a rust fungus

How much of my roots should be submerged?

 

[covert222]

As far along as you are I wouldn't worry too much or at all. But for the future I definitely think you should max fill your tray to get as much root coverage as possible just don't do it 6 times a day.I think every 8 hours or 3 times a day is the right amount but I do know people who go every 6 hours

 

[kfos]

As far along as you are I wouldn't worry too much or at all. But for the future I definitely think you should max fill your tray to get as much root coverage as possible just don't do it 6 times a day.I think every 8 hours or 3 times a day is the right amount but I do know people who go every 6 hours

How about cal mag. I did not realize that I needed to add it to my res. Can I add it next water change with no harm?

 

[covert222]

You can but you don't need to in my opinion