3. Natural mineral fertilizers- gen

3. Natural mineral fertilizers- general (minerals/nutrients) – Plant, animal, and rock-based amendments can be helpful in adjusting the major soil nutrients in addition to adding micro-nutrients. Rock phosphate, potash, bone meal, blood meal, cottonseed meal, kelp meal, guano, and greensand are some of the options. The amount of adjustment needed will also be determined by the soil test. The different types of additives provide different major and minor nutrients and it is usually necessary to mix a few. Some of these are mined or a by-product of the meat industry.