Water treatment equipment, namely, devices connected to a water distribution line, which automatically injects a predetermined proportion of fertilizer into an irrigation system used by a greenhouse complex; Water treatment equipment, namely, fertilizer injection devices which connect to a water distribution line, which automatically injects a predetermined proportion of fertilizer into an irrigation system used by a greenhouse complex; Water treatment equipment, namely, fertilizer injection units, namely, devices connected to a water distribution line, which automatically injects a predetermined proportion of fertilizer into an irrigation system used by a greenhouse complex