Fertilizer is a byproduct item in RUST used in farming, spawnable via the F1 console. Players may only acquire it by placing items into the Composter.
Fertilizer serves two potential purposes. It may improve the ground quality of both the Large and Small Planter Boxes. Alternatively, it can be harvested and sold directly to Bandit Camp at a rate of 3 Scrap per 2 fertilizers.
For more information regarding fertilizer and its assorted uses in plants, check out our extensive Farming guide.