Soil with NPK - when to start adding liquid NPK?

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ActivatedAlmonds52

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I'm growing Shiva Skunk and it's on day 30 from seed and day 12 since cup->pot transplantation. I use Canna Terra Professional, which has pH 6,0 and NPK 12-14-24.

I've read somewhere that the NPK in the soil gets depleted after a while. I'm also well aware that I'm supposed to start adding NPK fertilizer at some point anyway.

My fertilizers are almost all BioBizz: Bio-Grow (NPK 4-3-6), Bio-Up (pH+), Bio-Bloom and CalMag. What would be the best time to start doing this?
 

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