Requires: plow, seeder, cultivator
Usage: 1 stage of fertilization, cannot be harvested
Special characteristics: Cheap to seed a field with and works as a fertilizer giving 30% increased yield.
For best results, plant the oilseed radish on a plowed field without any fertilizer in your seeder. Let it fully grow. Then cultivate over the oilseed and then plow/seed your next crop.