I start of with Sunshine Organic Growers Mix which consists of 40% organic peat moss, 30% organic coir (washed and inoculated with trichoderma spores), 10% perlite, 10% vermiculite and 10% pumice (medium size). The reasons that all 3 are added by the manufacturer has to do with the CEC (cation exchange capacity) of these 3 aeration amendments. The soil is ph adjusted with dolomite lime and is treated with organic yucca extract as a wetting agent.
This is a professional 'soilless mix' for the nursery plant industry. All of the products used are the best available.
BTW - Sunshine Mix is manufactured by Sun Gro Horticulture which also manufactures Black Gold products (their consumer line) and some other products that appear at Home Depot and Loews, etc. Sunshine Mixes are generally available in the Western US and ProMix is manufactured and distributed in the Eastern US. There is no difference between the 2 products if you're comparing apples to apples.
To the soil I add 25% organic compost, 1 cf. of pumice or rice hulls and that's the basic soil
To that I add 1 cup (per 1 cf.) seed meal (equal parts of canola, cottonseed, flaxseed and alfalfa) to replace the bloodmeal ('N') and organic fish bone meal (4-20-0) to replace the bonemeal in the original LC Mix.
About 1/4 cup of kelp meal and 1 tablespoon of mycorrhizal fungus to each 5 gallon pot and I sprinkle about 1/4 cup of neem seed meal as a top dressing.
That's it other than applying aerated compost teas at the beginning of the veg cycle and then again at the beginning of the flower cycle (a high-fungai tea facilitates the take-up of phosphorous). Just water and I hit them with a foiliar spray of fish enzyme and seaweed extract 1x a week and neem seed oil 2x times a week through veg and the first couple of weeks in the flower cycle to prevent mites and powdery mildew.
It works without any burning, stunted growth, whatever. Just add water.
This soil costs me less than $6.00 per cf. to put together.
Edited by LumperDawgz, 10 February 2009 - 07:28 PM.