Some gardening techniques that are taken for granted are not healthy for soil. For example, the NRCS cautions that tilling the soil disturbssoil's organic reserves. Minimally till or do not till at all. Use a pitchfork to loosen soil from above. Concerning fertilizer, human manure should be used only with great care. Since there is a risk of disease and pollution, one should educate oneself about the proper use of human manure to improve soil.
With commitment and education, one can improve one's soil to its best condition to grow healthy crops. While there is a learning curve to soil management, the lessons are valuable and offer ample rewards. As the seasons pass and the garden is well-managed, soil will improve and one's garden will be truly "green."