Know by testing the Nitrogen ...
Published by Veronica Lack, Section 11, Cedar (W) Township, Mitchell County, 1475-325th Street, Nora Springs, IA 50458 USA
Know by testing the Nitrogen content of your irrigation water (Nitrogen Spectrum tests) which include the Ammonia Nitrogen as (N) test that will indicate the amount of Anhydrous Ammonia fertilizer runoff recaptured in your irrigation water. So don't add Chlorine, for the Biological Nitrogen runoff in the irrigation water to lessen the algae growth, as it reacts with the Anhydrous Ammonia, that creates a larger issue.