We recommend that you do a professional soil sample analysis through your county's Cooperative Extension service. If you are in the NYC area in NY state, you can contact The Westchester County Cornell Cooperative Extension for information on submitting soil samples .You can mail or drop off your samples and their labs will perform a variety of diagnostic tests. The results are more accurate than home tests. Forms, instructions and information are available through the link above. You can email or call for more information.
westchester@cornell.edu
914-285-4640

In other states or counties, you can search online for your county's cooperative extension service and contact their residential horticulture consultant. Most cooperative extension offices offer soil analysis services at a reasonable cost and can direct you to a lab if they do not. If you need help finding information about contacting your local cooperative extension, please email us and we would be happy to help: Plantinfo@NYBG.org.

Courtesy of NYBG Plant Information Service