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2. Ammonium sulfate - Wikipedia

   en.wikipedia.org/wiki/Ammonium_sulfate

   Ammonium sulfate (American English and international scientific usage; ammonium sulphate in British English ); (NH 4) 2 SO 4, is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen and 24% sulfur .

3. Soil pH - Wikipedia

   en.wikipedia.org/wiki/Soil_pH

   Acidifying fertilizers, such as ammonium sulfate, ammonium nitrate and urea, can help to reduce the pH of a soil because ammonium oxidises to form nitric acid. Acidifying organic materials include peat or sphagnum peat moss.

4. Ammonium nitrate - Wikipedia

   en.wikipedia.org/wiki/Ammonium_nitrate

   Ammonium nitrate is a chemical compound with the formula NH4NO3. It is a white crystalline salt consisting of ions of ammonium and nitrate. It is highly soluble in water and hygroscopic as a solid, although it does not form hydrates. It is predominantly used in agriculture as a high-nitrogen fertilizer.

5. Calcium ammonium nitrate - Wikipedia

   en.wikipedia.org/wiki/Calcium_ammonium_nitrate

   Most calcium ammonium nitrate is used as a fertilizer. Fertilizer grade CAN contains roughly 8% calcium and 21-27% nitrogen. [6] CAN is preferred for use on acid soils, [5] as it acidifies soil less than many common nitrogen fertilizers. [6] It is also used in place of ammonium nitrate where ammonium nitrate is banned.

6. Diammonium phosphate - Wikipedia

   en.wikipedia.org/wiki/Diammonium_phosphate

   DAP is used as a fertilizer. [4] When applied as plant fertilizer, it temporarily increases the soil pH, but over a long term the treated ground becomes more acidic than before, upon nitrification of the ammonium. It is incompatible with alkaline chemicals because its ammonium ion is more likely to convert to ammonia in a high-pH

7. Labeling of fertilizer - Wikipedia

   en.wikipedia.org/wiki/Labeling_of_fertilizer

   The NPK analysis label. Fertilizers are usually labeled with three numbers, as in 18-20-10, indicating the relative content of the primary macronutrients nitrogen (N), phosphorus (P), and potassium (K), respectively. More precisely, the first number ("N value") is the percentage of elemental nitrogen by weight in the fertilizer; that is, the ...