So in my case would you be concerned at all regarding the diet of the horses throughout their lifecycle in the manure in my mushroom compost? Also I was only going to consider driving once to see the place and maybe get a free bin set up if I bought the worms on site. In the above example the vermicompost ships free $50/20lbs, so no constant driving, would you consider this worthwhile? I would need about 80lbs at this time to cover the needs of my soil mix and I am willing to pay for it if necessary. However the mushroom compost is significantly cheaper. Please be mindful that I am planning to reuse this soil and add the appropriate amount of worms per container size as well.
I definately am concerned about the ratios because youre correct that 33% of my final soil is compost. If mushroom compost is not all that good compared to true vermicompost or can even be hit or miss(I was genuinely asking), then it is not worth it for me. Fire in fire out all the way
Do you consider the castings from BAS to be good quality?
No way to know for sure what is in the mushroom compost but if it is horse poo based then I would not be too concerned because:
A. People typically feed horses a high grade diet; nobody wants to have to pay for a vet to look at a sick horse
B. Horse poo substrate is typically about a 50/50 mix of composted horse manure and straw with some gypsum added in. All things good…
C. Mushroom compost is already fully composted…nothing in it that can hurt anything else
$50 is a steep investment in vermicompost but seems fairly priced if it is somewhat fresh and highly active. Honestly nothing beats your own homemade ewc fresh from the worms ass. BAS worm castings? Ok but again you are probably paying too much. You can get started with something like a 50/50 mix of ewc and spent mushroom substrate. Don’t sweat it if your calculated ratios do not match the soil recipe. Organic inputs do not have to be that exacting. You can find bagged ewc anywhere but consider starting a worm bin to make your own. Use a bagged compost (like say coast of Maine like some body else said) to get started if you need to. Just be sure to add ewc as well.
When people say they have a ph lockout in soil it means the soil has become inactive. Dead microbes cannot consume organic matter thereby causing the fungi to starve which can no longer absorb nutrients broken down by the aforementioned dead microbes.