The present utility model pertains to the composition of a biochar medium for growing seedlings but more specifically to a hollow-cylindrical briquette made from carbonized rice hull and an organic fertilizer necessary to provide the nutrient requirement of seedlings. This utility model comprises the following: 45-48 pcnt Biochar, 16-19 pcnt organic fertilizer, 33.3 pcnt tap water, and 2. 7 pcnt binding material.