Csontliszt

Csontliszt, known in English as bone meal, is a fertilizer produced by grinding animal bones into a fine or coarse powder. It provides concentrated phosphorus and calcium to soil, supporting root development, flowering, and overall plant vigor.

Most bone meal is high in phosphorus and calcium with relatively low nitrogen. The product can be sold as finely milled meal or larger granules, and may be steam-treated or calcined to reduce pathogens and odors.

Production involves cleaning and drying bones, then grinding to the desired particle size. Some forms used historically in animal feeds were restricted after disease-related concerns; bone meal for horticultural use is typically produced under fertilizer standards and is not intended for consumption by animals.

Uses include vegetable gardens, fruit trees, and ornamental borders. Bone meal acts as a slow-release source of phosphorus, promoting strong root systems and early flowering. It is often favored in organic programs, though it should be chosen and applied with soil tests in mind.

Application guidelines vary by product and soil conditions. Generally, work the granules into the topsoil near active roots at planting or as a periodic top-dress, and water after application. Do not apply to seeds and avoid combining with lime, which can reduce phosphorus availability.

Safety and environmental notes: handle dry bone meal to minimize dust inhalation; store away from pets and wildlife. Excessive use can contribute to phosphorus runoff and eutrophication; follow local regulations and product labels.