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.

Can I apply ammonium sulfate on corn that is already up?


Yes, it is safe to apply granular ammonium sulfate on corn that is already up. As a matter of fact, sidedress applications of ammonium sulfate — often in blends, but also straight — are a very common practice.

Unlike urea, ammonium sulfate is not subject to volatilization on neutral or acidic soil — the optimum soil pH range for corn and most other crops. In other words, ammonium sulfate safely stays on the soil surface until incorporated via rainfall or irrigation.

A few ammonium sulfate granules may get caught in the whorl of plants, which may cause more or less salt injury depending on the rate. This is a localized and transitory effect, though. It is no longer apparent within a matter of days as new leaves come out.

Add a Comment

Your email address will not be published.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


  1. Between granula ammonium sulphae fertilizer and NPK fertilizer which one is the best for maize production?