Magnesium Def? Maybe? Pictures

I am growing in Hydroton in an Ebb and Gro system. Using Humboldt Oneness nutrients with a little bit of Hygrozyme and I have added about 2 ml/gal of MagiCal that came with the system. Using RO water but I am also using the wastewater from the RO filter because it is filtered with a sediment filter and a charcoal filter too and it fills the res faster that way.

Recently I have noticed my larger plants (Purple God Bud) have been having a few problems with some of the larger fan leafs.

After doing some research I think that it is Magnesium def and I will add a Magnesium supplement but I just wanted a second opinion first so that I don't burn them or lock out another nutrient or something along those lines.

Thanks,
MonsterRobot

Is the ph stable...you need to aerate the oneness nutrient solution for 24 hours before using

jamaica420 said:

Is the ph stable...you need to aerate the oneness nutrient solution for 24 hours before using

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I have been aerating the oneness for 24 hours and there are some PH spikes but I take care of those right away so at feeding time the PH is stable... After my bottle of oneness is gone I am going to switch to something else... the whole process is kind of a pain in the ass...

yeah i agree, it is a pain in the ass...i grow in soil so i gotta shake it up reallly good and it usually takes 2 or 3 days to stabilize back to about 6.0 before i can use it. But i'll be getting something else when my bottle runs out as well

I added some more cal mag and things aren't getting any better... it is progressing and happening to more of the plant... Help!

Flush it with plain water 3 times the amount of the container (3 gallon container=9 gallon water) then give it a mild complete NPK feeding

jamaica420 said:

Flush it with plain water 3 times the amount of the container (3 gallon container=9 gallon water) then give it a mild complete NPK feeding

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I am growing in Hydroton with a Flood and Drain system...

Res change with mild NPK for a few days maybe?

MonsterRobot said:

I am growing in Hydroton with a Flood and Drain system...

Res change with mild NPK for a few days maybe?

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I dont have too much experience with hydro but i think that would be a good bet

Looks like phosphorus def to me

Looks like a pH problem or possibly manganese. Not Magnesium, Mag is easy to spot - the veins are green while the rest gets yellow. Here's a pic where I circled the leaves that are showing it.

How do people come up with PH all the time, PH could cause many different things.

smppro said:

How do people come up with PH all the time, PH could cause many different things.

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I based the pH suggestion on the pics of the plants - it looks like pH spotting that occurs before lockout. The manganese suggestion was based on the pics of the leaves.

yep looks like a manganese not magnesium def which is caused by too high of a ph. im having the same problem i think. flush and then water with light nutes with a ph of 5.8-6.0

100% Magnesium deficiency, its not manganese, as just like an iron deficiency you would see chlorosis of interveinal areas of the lead, but even the smallest veins persist in their green colour. Due to the older leaves being afftected first it seems and actually dead areas appearing with dead spots in its early stages, and the splitting of mid ribs and veins can be seen as well. Use a magnesium leaf spray, such as Epsom salts, and apply Epsom salts or calcium-magnesium carbonate to the soil.I don't believe the acid in the soil is a problem for now, you would have seen manganese and molybdenum deficiency much earlier than magnesium as they are trace elements and would have depleted first in a normal environment. Also on another note, increase your phosphorus as it seems the stems leading to the leaf are turning purple maybe bluish-green?

so now you have 4 diff opinions, you might be worse off.

Looks like it could be a progressed fungus or a bacteria. Root rot also produces those spots. I really dont think its a defic. Mg causes interveinal chlorosis, not huge circular rust spots that plow right thru the veins. I would treat with Daconil (chemical) or Serenade (organic) just to be safe. It wont harm ur plants and is actually a good idea to add it into ur routine a s a preventative measure. Especially when outdoor conditions are humid.

This is mg def.

I am pretty sure it is mg def... Thanks for all of the input... I foliar fed the plants epsom salts and changed my res out and things are looking a lot better!