Thinking about topping up my soil… should I consider something fancier than soil, bat guano I’ve heard, worm casings 
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What else have you tried so far?
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I haven’t tried anything yet.
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I like roots organics. For “Top dressing soil”
https://www.aurorainnovations.com/roots-organics-dry-nutrients
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What’s the grow using currently or usually?
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Do you have a nute regimen that your using now?
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If you have a large amount of soil to re amend a soil test might help to identify which nutrients you are low in and what needs to be boosted. Without a test I would try to get as much balance and variety as possible in amendments. Gaia 4-4-4 all purpose has a decent combination of ingredients to give a more balanced adjustment.
If there’s any deficiencies visible I would make sure to add more of that specific nutrient, moulders chart is worth mentioning if your playing with nutrient levels
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I have a soil test kit actually, I’ll give it a try.
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