A fertilizer injector can be attached to some drip irrigation systems. Were you aware of that? The injector is filled with 100% water soluble fertilizer, is connected to the drip system and delivers water + fertilizer. However, do not use products like fish emulsion in the injector and use a back-flow preventive unit to prevent the liquid fertilizer from entering the home water system. I have not used this drip capability as I fertilize with composted manure and organic compost most of the time (not sure if all brands of drip allow this set up either) but, review your drip's user manual (or call the 800-number) or ask your landscape company. Check this link:
https://www.youtube.com/watch?...
