As is your right, also, you're compelled to -- it's the tribal thing.
Sounds good in theory but alas, in most cases, another myth.
The term 'run-off' is sort of a misnomer. The water and highly water soluble guano doesn't actually
run off, never to be seen again. Unless you're shop vac-ing the drain pan after watering (some do, vast majority don't), the highly water soluble guano is constantly being wicked back into the root zone. Quite a few growers, myself included, shoot for zero run-off.
Dolomite lime absolutely does have enough calcium and magnesium when used appropriately, and you can use quite a bit without overdoing it. It works great alongside eggshell or crabshell meal to even out the calcium to magnesium ratio, such as in this recipe, which works fantastically:
Base mix:
- 50% Sunshine Adv. Mix #4 - e.g. 4 gallons
- ~25% Coco coir - e.g. 2 gallons
- ~25% compost or castings - e.g. 2 gallons
- Calcitic/dolomitic lime - Half cup (~8 tbsp)
- Eggshell meal - 4 tbsp
For amending, the following (all per gallon):
- 1.5 - 2 tbsp Alfalfa meal (Down to Earth brand recommended)
- 1 - 1.5 tbsp Kelp meal
- 1.5 - 2 tbsp Fishbone meal
- 1.5 - 2 tbsp Neem seed meal, if available*
- 1 tsp Azomite (or rock dust, etc. @ recommended rate)
Because you know what the magnesium ratios are of super soil with and without the epsom salt, because you made a batch and had it tested, correct? Bet.
While I tend to agree that direct contact to the roots is the most sure fire way of ensuring inoculation, quite a few manufacturers say it can be mixed into potting soil, as well as watered in. Many soil mixes and fertilizers come with mycorrhizae already added and as a matter of fact, Mycorrhizal Applications Inc., a contributer to the much revered publication, Teaming with Microbes, states that temperature should not exceed 140 degrees for manufacturers pelletizing or those looking to
compost their granulated mycorrhizae -- infering perhaps temperature, not predation, is the primary limiting factor during a hypothetical 'cooking' process. They have supposedly been around for roughly 450 million years. We probably shouldn't be so quick to underestimate their durability.
1. Because it's part of the recipe.
2. Because of its popularity. Super Soil has a mostly positive reputation among those who've used it. So word of mouth.
3. Peace of mind knowing that they're using a recipe that quite a few folks have used successfully.
4. 150 bucks is a negligible investment for a year or so worth of organic growing medium.
5. It really is no one else's business what other people do with their hard earned money.