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.

When is ammonium sulfate typically applied on wheat?


It will depend on soil and weather conditions, but particularly on coarse soils, it is a good idea to split apply your ammonium sulfate as follows:

  • A first application in the fall to promote tillering before the wheat goes dormant – typically in a blend with phosphorus and potassium sources
  • If fall tillering is poor for any reason, an early spring application of ammonium sulfate at green-up time may be in order
  • The bulk of the nitrogen is often applied right before stem extension, typically as an ammonium sulfate and stabilized urea blend

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    1. Most commercial labs use the Mehlich 3 soil test. While this test is convenient in that it analyzes several nutrients, it is not the most reliable test for sulfur. Additionally, sulfate sulfur is mobile within the soil, so the recommended practice would be to submit both soil and sub-soil samples for analysis, which is seldom done. In the Mid-Atlantic, where a lot of soft red winter wheat is grown, experts often recommend taking a tiller count. When that count is below 100 per square foot, ammonium sulfate at green-up is a preferred source to boost tillering.