I agree with the high humates comment. It seems that way for me as well after putting out so much manure/compost a little fert goes a really long way and sometimes I would swear I can see a difference in 12 hours or so.
Looking at the design of that pvc setup made me think that it would likely work well for a single row system if you made it taller and dropped strings down. Ofc then you'd have to use clips which I am learning can be tiresome.
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