: a colorless crystalline salt (NH4)2SO4 used chiefly as a fertilizer
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For each application, apply a nitrogen fertilizer such as ammonium sulfate or bloodmeal in a foot-wide circle around each plant according to label rates.—Kim Toscano, Southern Living, 20 Jan. 2025 Metroplex recommendations, however, suggest less phosphorus (middle number of the analysis) or even all nitrogen such as ammonium sulfate applied to our alkaline black clay gumbo soils.—Neil Sperry, Fort Worth Star-Telegram, 17 Jan. 2025 Typically, the solution used is ammonium sulfate.—John Timmer, Ars Technica, 3 Nov. 2022 The method extracted a higher percentage of the REEs more quickly than conventional leaching and needed less ammonium sulfate.—Bydennis Normile, science.org, 1 Nov. 2022 They are usually extracted by pumping large quantities of ammonium sulfate or a similar solution into the ground.—Bydennis Normile, science.org, 1 Nov. 2022 The ReencleMicrobe mix at the heart of this process contains rice husks, vermiculite, nonpathogenic bacillus bacteria, ammonium sulfate, and wood pellets, according to the company.—Richard Baguley, Wired, 31 Mar. 2022 For example, ammonium sulfate is usually sold as 21-0-0 (sometimes as 20-0-0).—oregonlive, 29 Jan. 2022 Gardeners often apply fertilizer to their crops in mid-summer with a cup of ammonium sulfate (21-0-0), a cup and a third of calcium nitrate (15-0-0), or about half a cup of urea (46-0-0) per 10 feet of row.—oregonlive, 19 July 2021
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