Compost, compost tea, organic fertilizers, more compost, blood and bone meal, fish emulsion, mulch, cover crops, and more compost are all important parts of the equation, depending on pH levels that can be determined in a soil test (best to have done by your state's Extension office). Compost gets expensive, which is why we built large scale compost bins in efforts to make and supply our own compost needs. This year we produced two yards, which is a solid step in our self-sufficiency direction.
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Hover over photos below for captions.