In another aspect, an irrigation system having a liquid fertilizer input from a liquid fertilizer production system is provided. The irrigation system includes a liquid fertilizer production unit connected to the irrigation system to provide liquid fertilizer directly and continuously, as the liquid fertilizer is produced, to the irrigation system. The fertilizer production unit includes a compost feed source, an extractor to produce liquid fertilizer from compost of the compost feed source, and a discharge area. The compost is fed to the extractor by a conveyor. The extractor may have a continuous belt configured to revolve about a roller. The belt is driven by a drive source such as a motor. This belt has a plurality of apertures in its surface that allow water to pass through the belt. Water sources are positioned above the belt and are configured to provide water to the belt and any compostpositioned on top of the belt. A collection area is positioned to collect the water (which is now a liquid fertilizer). This collection area is directly connected to the irrigation system by, for example, a pump, providing direct flow from the collection area for the liquid fertilizer.