I'm very interested in making soil blocks next year, but every recipe for soil I see has at least one laboratory-made ingredient (lime, colloidial phosphate, etc.) Does anyone have a recipe for a fully organic planting medium?
I'm sure that's an excellent product, but it'll get pricey in a hurry when I'm preparing for spring planting. What can I prepare myself using soil, my own compost, and just a few purchases (perlite, greensand, etc.)
I wouldn't consider lime a laboratory made ingredient. Agricultural lime is just finely crushed limestone. Otherwise the lime used in building and masonry is ground limestone that has been processed at high heat to produce CaO.
I am unfamiliar with soil blocks. I am guessing you grow things in them? I am familiar with compressed earth blocks, but what little I have read here suggests completely different concerns, materials, and usage. What have I missed?
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein