Healthy soil is sadly becoming rarer to the planet. To understand how to improve soil, we need to understand the basic make up of soil. Soil is a living system. All soil is a mixture of inorganic and organic materials. Soil contains a great diversity of macro-organisms (worms, ants, etc) and micro-organisms (bacteria, fungi, algae and yeasts). The soil provides anchorage and support for plants which take nutrients and water from it. The action of the soil organisms on the dead and decaying matter returns nutrients to the soil. There is a direct relationship between the fertility of the soil and the efficiency of this recycling process.