bladgödsel

Bladgödsel, literally meaning leaf fertilizer in Swedish, refers to plant-based fertilizers produced from processing leaves to release nutrients that can be returned to the soil or applied to crops. It has been used in traditional and organic farming as a low-cost source of minerals and organic matter, especially where leaf biomass is plentiful and mineral fertilizers are limited.

Production methods vary. A common approach is to extract nutrients by steeping or fermenting plant leaves, such as nettle, comfrey, or other broadleaf species, in water to produce a nutrient-rich liquid that is applied to the soil or to foliage. Leaf material can also be composted or dried and milled into a powder for soil amendment, though the term bladgödsel usually refers to liquid extracts. The nutrient content is highly dependent on the plant source and the extraction method, and it typically provides nitrogen, potassium, calcium and trace elements, but is less predictable and often slower to release than mineral fertilizers.

Applications and considerations. Bladgödsel can be used as a soil drench or a foliar spray, and is commonly employed in organic and low-input systems as a supplementary nutrient source and soil conditioner. Because leaf extracts may contain organic compounds and acids, proper dilution and, if possible, testing are advised to avoid phytotoxicity or soil imbalances. It is generally not regarded as a complete fertilizer and is best integrated with other nutrient management practices, such as compost, green manures, or mineral inputs when appropriate.

See also: compost tea, foliar feeding, green manure, organic fertilizers.