Viewing post #2332530 by sooby

Seedfork said:"Chemical fertilizers containing ammonium or organic fertilizers with protein (amino acids) acidify neutral and alkaline soils. Ammonium is nitrogen and hydrogen (NH3-). As ammonium fertilizers create nitrate, they release free hydrogen atoms to create an acid soil."
https://www.ehow.com/info_8055...

However nitrate nitrogen fertilizers can raise soil pH:

"The ratio of nitrate to ammoniacal nitrogen in a fertilizer determines the rate of substrate pH change and can even be used to correct pH during production. The pH changing property is known as a fertilizer's potential acidity or basicity and is listed on a fertilizer's label (Table 1)."

http://www.greenhouse.cornell....