This paper (“The double action of soil in nutrition, indispensable for life perpetuation on land”) underlines the importance of continuous nutrition and respiration for life’s perpetuation. Living creatures need a continual consumption of organic matter (i.e. energy and substances), water and air (O2). The biosphere has created its own system of nutrition; it is producing and feeding on the necessary macroergic organic substances. In this system, the solar energy is converted in potential chemical energy of organic compounds by photosynthesis achieved by autotrophic plants (with chlorophyll). In fact, the solar radiation (light, heat), the autotrophic plants (with chlorophyll) and the soil are the three factors contributing to the primary biomass production: the sun offers the energy, the soil gives the chemical elements (nutrients), while the plants are the technology for production, in the end becoming a product themselves. The productive capacity of this ensamble is used by man in agriculture and sylviculture. The soil’s action in this productive process is double. On one hand the soil has a constructive action in association with autotrophic organisms, contributing to the photosyntesis of the organic phytomass (which represents the basis of the biosphere’s existence), and on the other hand the soil has a dismemberment– recovery action in association with heterotrophic organisms, storing and recycling nutrients that subsequently enter in a new cycle of living. The two actions are complementary and are included in the biogeochemical cycle of nature.