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.

I’m in the Northeast part of Texas in Commerce. For pecan trees when would you recommend application for ammonium sulphate and is there anything special I need to know about or tell the place I get it from? I’m assuming like a feed and seed store would carry it. Or would I have to go somewhere else? And how much would you recommend per application or per tree? Thanks for the help.


In Texas and other regions with calcareous soils, ammonium sulfate (AMS) is often used not only as a source of nitrogen (N) and sulfur (S), but also to increase phosphorus and micronutrients availability to the roots.  In such cases, mature trees may get as much as 150 to 200 lb N/acre/year in the form of AMS, or about 750 to 1,000 lb AMS/acre/year.  In the case of non-calcareous soils, AMS may be blended with urea to a N:S ratio closer to 9:1 (instead of the 1:1 ratio in AMS).  Given that AMS is a very common fertilizer in Texas, you should have no trouble finding it at your local fertilizer or home and garden store.

Add a Comment

Your email address will not be published. Required fields are marked *