Table 4.

Study on the secretion of siderophores by microorganisms from 2000 to 2023.

Years	Quantity
2000–2002	8
2003–2005	9
2006–2008	13
2009–2011	15
2012–2014	19
2015–2017	592
2018–2020	818
2021–2023	1024