New York City Gardener Practice Exam

Raw bone meal provides phosphorus for plants, but the phosphorus is very slowly made available. It’s in a mineral form that must be mineralized by soil microbes and dissolved into the soil solution before roots can uptake it, so it won’t meet quick phosphorus needs or aid rapid growth right away. This slow release is the main drawback for gardeners who need immediate P availability. It can still be useful as a long-term, steady source, especially in acidic soils, but the immediate availability is limited. Bone meal doesn’t repel insects, it doesn’t act as a soil-structure improver in the short term, and it doesn’t supply nitrogen quickly—in fact its nitrogen content is small and released slowly.