Find a Logging Point and click it. There are 6 general locations where logging points may be found. Watch for JA aggro from Ephemeral Murex or Magic aggro at night from Ephemeral Amoeban randomly roaming any of the logging locations.
The Mineral gauge for dummies key item stays in your temporary key items until you zone, even after completing the quest. Additionally, zoning will not reset your light and you can get your reward or the fertilizer. However, you must still zone to restart the quest.
Upon repeating the quest, a logging point you fertilized will always give blue light if it was previously yellow.
Unknown if fertilizing red will cause blue also. Be aware that the fertility might drop back to yellow again.
It is possible to force Logging Points away from "undesirable" locations by Logging the point using a Hatchet.
Using a macro, or typing out and reusing the command, /item Hatchet <t> on a logging point will make logging as fast as possible among aggressive monsters.
It may take as few as one try, or possibly several tries, before a Logging Point will disappear.
The logging point has a chance of re-popping in the same spot, or in the same general area. If this occurs, continue logging the undesirable points until they do not reappear.
Unknown what would happen if a person needed to fertilize a logging point to finish the quest, and another person logged the point away before they were able to.
Only three logging points seem able to load in the zone at one time.
It is possible to load all three points in one general area.
It is possible to force all three logging points into the Atrociraptor area. One of those three points is only 25 yalms from the Conflux.
Until a proper logging map is created, a general overview of the points are:
Sieglinde the alchemist is investigating soil quality along the coast, and has custom-designed a contraption for that purpose. Take the aptly named "mineral gauge for dummies," and thrust it into a likely spot of earth by a tree.