Minecraft wiki entry for Farming, associated text: Fuel is difficult to supply automatically, but a bamboo farm may be able to keep up. Alternatively, a fuel chest can be loaded with dried-kelp blocks. A chest full of 1,728 items can be smelted by 18 lava buckets, 22 blocks (or 216 pieces) of coal, 288 logs crafted to planks, 87 dried kelp blocks... or four chests full of bamboo.