DIY Coco Coir Nutrients

Is there a reason why it's for coco and not soil? On most major nutrient brands ( Fox Farms ) not sure about others but their feed is usually less for hydro/coco than it would be for soil...
 
Well there annotations for how to adjust but most people using soil go organic and don't add chemicals.
I was just curious, thanks! When you say chemicals, what does that mean? I use Roots Organic soil mixed with about 30-50% coco, which is not organic and use General Hydroponics as my nutrients.
 
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