Browning of the leaves, please some advice

In week nine with my autoflower amnesia haze and since 2 days top leaves start having brown spots and than the whole leave gets brown/yellow and curls up. i would think nutrient deficiency but don´t understand how as i am feeding acording to manufacturer and ppm looks to me like its it the right values. But obviously somethings off.

Watering
09-12-2020 Feeding water: Ph 6.8 ppm 100 Runoff water: Ph 7.1 ppm 380
No Calmag & no Cana Terra Flores (did feed this 02-12-2020

16-12-2020 Feeding water: Ph 6.3 ppm 680 Runoff water: Ph 6.7 ppm 890
5ml/10lt Calmag & 50ml/10lt Cana Terra flores

Good reference chart. Are you in soil or coco?

You have a calcium deficiency.

Dontjudgeme said:

Good reference chart. Are you in soil or coco?

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Soil

hotrodharley said:

You have a calcium deficiency.

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So how would i resolve this? just give more calmag?

Ice-R said:

Soil



So how would i resolve this? just give more calmag?

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Not with your runoff measuring so high. I suspect lockout. Often calcium is the offender. I don’t like flushing in soil.

hotrodharley said:

Not with your runoff measuring so high. I suspect lockout. Often calcium is the offender. I don’t like flushing in soil.

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Hi so is 890 considered high? What should the runoff ppm be?

Ice-R said:

Hi so is 890 considered high? What should the runoff ppm be?

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You fed 680. Runoff is 890. Meaning they’re not using the nutrients you gave before.