AdvanSix’s agronomy experts are available to answer your questions about how to get the most out of your ammonium sulfate investment. Mercedes Gearhart has overseen agronomic research at AdvanSix for more than 20 years, and has a wealth of knowledge about fertilizer use efficiency and improving crop yields. Check out the questions asked below or ask your own question.

Is ammonium sulfate good for pecan trees in Texas? If so, how much?


As a matter of fact, ammonium sulfate is recommended more than other nitrogen sources on high pH soils (common in Texas) because of its acidifying effect. It temporarily increases the availability of micronutrients, such as iron and zinc. In such cases, mature trees may get 150 to 200 pounds of nitrogen per acre per year, or about 750 to 1,000 pounds of ammonium sulfate per acre per year.

On acid soils, ammonium sulfate is still recommended, although at lower rates, to supply sulfur nutrition. A nitrogen-to-sulfur ratio of 9 to 1 has been shown to be optimal for maximum pecan growth.

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