Fertilize now. The alkalinity is good enough as is and will improve over the next few weeks. Wait a mth and get another analysis. Ph changes during every 24 hour period. Don't worry about pH if your alkalinity is over 20ppm. See this from the archive first.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=96127#Post96127

Last edited by ewest; 05/31/11 09:13 PM.