Diagnosis please

Getting brown rusty patches on my leaves. not sure what is causing it.

Strain is Dosidos Auto. 2 weeks into flower

Medium is BioBizz All-mix compost.

Feed schedule is 1ml BioBizz Grow, 2ml BioBizz Bloom & 1ml Maxicrop Liquid seaweed per 1L of water.

I live in a Hard water area, i had a look at the local water companies report for my area and Calcium is 126mg/L it doesn't mention Magnesium anywhere on the report.

I have been adding 1tbsp Epsom Salts per 5L (gallon) but the problem still persists

Temps are, lowest is 22.C (71.F) highest is 31.C (87.F)

Lights are a diy led build using 300w Samsung FSERIES GEN3 4000K strips

I am also getting the same problem on my babies.

Phosphorus deficiency

hotrodharley said:

Phosphorus deficiency

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Thanks mate.
I am already giving it BioBizz Bloom NPK is 2-7-4
I will up the bloom until i can get some worm castings or fish blood and bone and make a tea

subudai said:

Thanks mate.
I am already giving it BioBizz Bloom NPK is 2-7-4
I will up the bloom until i can get some worm castings or fish blood and bone and make a tea

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Sometimes it can happen when there's too much Ca or Mg. If you know you're feeding enough enough of something and your plant is still showing deficiencies it's a good time to check your Mulder chart.

I'd say ya got nute burn.

I agree w/ hotrodharley……a plant’s biggest need for phosphorus is early-mid flower. Now exactly how to resolve the problem is another story. I’ll leave that to more experienced farmers, but I grow with dry organics and top dress w/ bone meal right after I flip…..it seems to be working.

I think the majority of issues when it comes to soil can be attributed to over feeding. It’s easy to do (ask me how I know) but when you’re in a nutrient rich soil any additional nutrients can cause issues and the problem is you can’t say for sure how much of which nutrients are in the soil.

I'd say u can't fix old deficency. Those are fucked up older leafs. Take note you messed up and figure out how. Don't keep doing it or just add more stuff.

Slurry test for the win

ProPheT 216 said:

I'd say u can't fix old deficency. Those are fucked up older leafs. Take note you messed up and figure out how. Don't keep doing it or just add more stuff.

Slurry test for the win

Click to expand...

The thing is, i have some others that are fine.
Its my first time growing an auto, maybe this is a fussy feeder?

I agree its a mess this plant, i have had a break for 2 years from growing so i am out of practice and trying to get back into the swing of things again.
The buds are swelling nicely despite the problems

Your plants are infected maybe spread by pest or disease. U will undoubtedly make it fine til harvest. Looks like u got 2-3 more weeks. U will not get the best out theze plants. Instead of trichomes everywhere including on some fan leaves your plant will be losing leaves and fighting disease instead of producing more trichs/terps etc. Plus your picking infected leaves. I say just ride it out but I don't know whats going on with your grow. Coco and hydro u can fix issues quicker cus u water frequent or change reservoir. Soil I'd say dont pluck leaves til the 75%-80% done and keep it moving til next grow. Even cut infected parts of leaves and keep the rest. Conserve as much as possible.
And/or deficiency But i lean more towards infection.