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A coarse, processed agricultural feed additive. Common sources include pulverized granite, limestone or oyster shells. Grit comes in many sizes (usually numbered, but may be labeled according to poultry size - chick, chicken or turkey.) Fine grit is an excellent material for topdressing new seedlings because it maintains a dry surface and deters mold and damping off problems.
Grit can also be added to raised beds to improve drainage, especially important for growing plants that require a gritty textured soil. Ground oyster shells will break down in soil, where pulverized granite will take much longer to degrade.
