I am seeing fairly good results so far with a 50/50 mix of biochar and garden dirt, adding soft rock phosphate, azomite, high calcium lime. and some form of nitrogen. Calcium nitrate on most things to get them going. Ammonia sulfate if what I'm planting needs an acid soil. Usually I'd add the sulfate when the plant blooms and starts putting on fruit. Tomatoes need plenty of it. I get the idea the biochar will gradually improve it's action and results over time and won't need much nitrogen added. Or much of anything else very often perhaps, since the carbon soaks stuff up and prevents leaching of soluble elements, also providing home for soil microbes that digest minerals and trap nitrogen from the air. In time I plan on playing with the sea minerals, strait sea water, (limited since it's a bit high in sodium) and various other products.
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