It's a bad idea in general, because a healthy sustainable soil is more than just available nutrients. Good soils also have micro-organisms that break down organ

It's a bad idea in general, because a healthy sustainable soil is more than just available nutrients. Good soils also have micro-organisms that break down organic matter which also releases more nutrients, introduces air into soil, some even have symbiotic relationship with plant roots. Also, you don't put raw manure directly into soils. You need to compost them first for at least 6 months. That alone breaks down and kills harmful organisms.