Building Organic Soil

What can an organic gardener add, where and how? Compost is the best, but until it is made, ready-made sources are available. There are many potting mixes which could be added to inadequate soils, but I recommend [those] which give no deleterious effects [have only natural ingredients]. The standard amendments, which do not provide much in the way of nutrients but which do improve texture, are peat moss and vermiculite. Standard amendments which do add nutrients are: rock dusts; meals high in nitrogen; sources of trace elements; sources of potassium; sources of phosphorus; sources of calcium; sources of sulfur; cover crops tilled in and allowed to decay; seaweed meal