It features built in irrigation and drainage. The Aztecs further intensified agricultural production by constructing systems of artificial irrigation. Research also showed environmental persistence in agricultural irrigation channels and soil. Saltwater is desalinated to produce water suitable for human consumption or irrigation. Egyptians developed and utilized a form of water management known as basin irrigation. The temples organized the mass labour projects needed for irrigation agriculture. They may also intensify by using manure, artificial irrigation and animal waste as fertilizer. Urea dissolves in water for application as a spray or through irrigation systems. These mountains supply 90% of the water used for irrigation within the watershed. The state was heavily dependent on agriculture, which required centralized irrigation. This allowed crops to be grown without requiring irrigation. Historically, the water was used for many purposes including cooking, irrigation, and washing. There is a widespread use of drip irrigation and greenhouses. Another endeavour involved the construction of small reservoirs for local irrigation. Kibbutz Hatzerim has a factory for drip irrigation equipment.