Editing Logistic function (section)

=== In agriculture: modeling crop response ===
The logistic S-curve can be used for modeling the crop response to changes in growth factors. There are two types of response functions:  ''positive''  and ''negative'' growth curves. For example, the crop yield may ''increase'' with increasing value of the growth factor up to a certain level (positive function), or it may ''decrease'' with increasing growth factor values (negative function owing to a negative growth factor), which situation requires an ''inverted'' S-curve.
{{multiple image
| perrow            = 2
| width1            = 300px
| width2            = 300px
| image1            = Sugarcane S-curve.png
| caption1          = S-curve model for crop yield versus depth of [[water table]]<ref>Collection of data on crop production and depth of the water table in the soil of various authors. On line: [https://www.waterlog.info/cropwat.htm]</ref>
| image2            = Barley S-curve.png
| caption2          = Inverted S-curve model for crop yield versus [[soil salinity]]<ref>Collection of data on crop production and soil salinity of various authors. On line: [https://www.waterlog.info/croptol.htm]</ref>
}}