Yellowing leaves with brown dots

Any ideas on what this could be. It's on the older growth, from top to bottom. Ph run off is between 6 and 6.5 in a soiless mix. 5 weeks into flowering.

Looks like a potassium deficiency?

Possibly caused by too much calcium?

Need more details about your grow to be sure

Digitalhemmorage said:

Any ideas on what this could be. It's on the older growth, from top to bottom. Ph run off is between 6 and 6.5 in a soiless mix. 5 weeks into flowering.View attachment 5201984

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Is the purple showing on the leaves as shown or is that from lights?

You need Calmag, take the one with N

The purple is not from the lights. I also use cal mag.

Can you post pics of the whole plant?.. it makes diagnosing easier..

I will post pics when I get home. Also the calmag is the 2-0-0

Kassiopeija said:

You need Calmag, take the one with N

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out of curiosity why would you add N during flowering?

Dtownhellbilly said:

out of curiosity why would you add N during flowering?

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You don't need alot of it, but you shouldn't starve the plant of nitrogen either.

Full plant picture.

Dtownhellbilly said:

out of curiosity why would you add N during flowering?

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Nitrogen is still important during flowering much less entire grow. It provides health , pigmentation, cell health , etc.

Although branching and new leaf slows at later stages - flowering plants continue to root.

What ph are you feeding at during flowering?
I like to vary my nutrient ph each feed keeping it in range of 5.8-6.3, not exactly the same every time during veg. Growing in coco you should lower ph during flowering.
When i see the chart showing the best ph to intake each nutrient, they don’t line up exactly at 6.0, some slightly above some below. 6.0 is generally in the sweet spot however the ph scale is not linear. It is more like the richter scale where 1 point represents 10x the strength so each tenth does make a difference.
If you are currently feeding at 6.0 and runoff is 6.5 I would feed at 5.5 ( no lower) and get the runoff to 5.6 to 5.8 during flowering.
My 2 cents-
Nice looking flowers-

Dtownhellbilly said:

out of curiosity why would you add N during flowering?

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Nitrogen is used by the plant during all stages of its life. It's needed for photosynthesis and is used by the plant for flower development. It does more than just keep the plant leaves green.

Tolerance Break said:

Looks like a potassium deficiency?

Possibly caused by too much calcium?

Need more details about your grow to be sure

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Wowww too much calcium...my soil has it excessevely. Do you mind helping me solve it? My plant Also have yellow and Brown dots and i know that i could've added too much Ca through a compost i have here

CannIHarvestit said:

Wowww too much calcium...my soil has it excessevely. Do you mind helping me solve it? My plant Also have yellow and Brown dots and i know that i could've added too much Ca through a compost i have here

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I don't think I can help you. Deficiencies look more or less the same between soil and hydro, but I don't know how to fix problems in soil.

Looks to me like it’s generally underfed. I’d up it feed 20-25%.