Animal origin fertilizers
Among organic fertilizers of animal origin, we distinguish fertilizers obtained from the processing of whole animals and from the processing of animal substances or organs.
The first group is meat meal, which is made from fallen animals (after degreasing them). It is mainly used as feed and is rarely used in horticulture. In addition to the precious, French fish guano is also known of the real guano, also called Biskaya-Guano. The starting material is whole sea fish or fish waste. The obtained substances are degreased, enriches with magnesium lime and undergoes aerobic fermentation.
Blood meal is precious, concentrated, fast-acting auxiliary fertilizer. It is used as an admixture for garden soil; it is sold in bags. It is suitable for preparing solutions for liquid fertilization.
Leather meal comes from the waste of the tanning industry. It is also suitable for the preparation of liquid fertilizer. From the animal skins intended for processing, selected remains are crushed and processed into organic fertilizer. It should be used strictly as directed, as it may contain various harmful metal salts, used for tanning.
One of the valuable auxiliary fertilizers is horn fertilizer, hooves, racic, bristles, feathers and bones. As can be seen from the figures in the attached table, these materials contain a lot of nitrogen, and bones - like a mole - more phosphorus.
Horn meal is a fast-acting fertilizer and can be applied directly to it
flower beds or for making special garden soil.
Horn grit is not processed as quickly by soil organisms. Therefore, for its plant growth stimulating effect, especially in cold weather, unfortunately you have to wait longer.
Horn chips are added to compost piles or used in the form of liquid manure for liquid fertilization. To facilitate grinding, some companies roast hard corners. In this process, proteins are regressed, which then decompose more slowly, which influences the revitalization of the soil. For the garden plotter, all horn fertilizers are very convenient, as they can be easily used in any way.
Fertilizers made of pig hair and bristles with the addition of hooves and leather are rarely used in horticulture. Fresh hair or bristles should not be composted immediately after receiving them from the slaughterhouse. The dried bristles can be easily and well mixed into the compost mass. Due to the high nitrogen content, they significantly improve the quality of the compost soil. Feather meal has similar properties.
Bone fertilizer is high in organic calcium phosphate. It accounts for approx 30% skimmed and detached bone meal. Bone meal, from which only some of the fatty and sticky substances have been removed, contains 18-22% phosphorus and 4% nitrogen. The latter is found in sticky substances and increases the absorption of phosphorus, which in turn promotes the growth of microorganisms. Bone meal is difficult for gardeners to find, because they are excellent additives to feed for farm animals.
Sometimes organic fertilizers made from municipal waste can be purchased. This mainly applies to municipal waste and sludge from sewage treatment plants, often mixed together and composted. Such compost undoubtedly contains some valuable organic substances, but the unknown composition of these composts makes, that they are not suitable for fertilizing food plants. If you know their origin and method of production, they can be used to fertilize lawns. These fertilizers are suitable for fertilizing green areas in the city, by greening the lanes along streets and railway tracks, reclamation, e.g.. gravel workings, quarries, and also for fertilizing wooded areas. Compost from municipal waste, However, it is not recommended for plots and gardens, there is in Poland "Dano" compost obtained by biothermal method
The chemical composition of the most important organic fertilizers is shown in the table.