Brown spots on my plant, trying to understand what it may be

Hello everyone , one of my plants its developing some brown spots , in some of the big leaves
the plant its in the 3 week of flowering
autos
organic soil
temperature from 18C at night to 22c during day
humidty around 45 to 50%





thank you for your help

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What type of organic soil are you using? At about your plants age they can show a calcium and magnesium deficiency. :blush::v:

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organic living soil , the base is biobizz light mix
they are in the 3 week of flowering

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Iā€™m growing in earth dust and they suggest a foliage spray of Calmag

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Welcome to the community ! @Flitme has you covered. If not already full dose of cal-mag next water day good luck :+1: :v:

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I also humbly suggest getting a microscope and examining the undersides of the leaves for pests. Sometimes bug damage can look a lot like calcium spotting.