Plants are living things that need nourishment on a regular basis, so they are continually depleting the soil of nutrients. Periodic fertilization provides the nourishment plants need to grow big, healthy and strong and be either prolific bloomers or produce lots of fruit. Organic fertilizers are the result of the natural decomposition of plant and animal waste. Sewage sludge, manure, compost and many plant meals are used as organic fertilizer. Also, all but bone meal contains a large percentage of Nitrogen and a small percentage of Phosphorous and Potassium.
Bone meal contains mostly Phosphorous.
Therefore, you would be required to supply additional fertilization to give your garden a balanced feeding. Also, the nutrients in an organic fertilizer are generally available only as decomposition occurs, which gives long lasting results but at a very slow pace. Inorganic fertilizers, those that are mined or manufactured, are high in nutrient value in proportion to weight. They can be accurately balanced in a variety of ratios. Inorganic fertilizers tend to dissolve quickly, so they are fast paced but are not long lasting.