Manure and fertilizers

A fertilizer or manure is any type of organic or inorganic substance that maintains or increases the content of nutrients in the soil, as well as improves the quality of the substrate at a nutritional level or stimulates the vegetative growth of plants.

Plants do not need complex compounds such as vitamins or amino acids, essential in human nutrition, since they synthesize everything they need. Plants only require about a dozen chemical elements that must be presented in a form that the plant can absorb.