Ask The Agronomist | AdvanSix Ammonium Sulfate

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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.

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Mar 31, 2017
How long does it take for elemental sulfur to become available in the soil?
In order to become available to plants, elemental sulfur (ES) first needs to oxidize in the soil, a process governed by several factors: size of granule, hardness of granule, soil temperature, soil moisture, soil...
Feb 24, 2017
Can I use ammonium sulfate on my vegetable garden?
Certainly! Like grain and forage crops, vegetables also need nitrogen and sulfur for photosynthesis and protein formation. As a matter of fact, many industrial vegetable growers include ammonium sulfate as part of...
Jan 18, 2017
Over-application of poultry litter to fields across my region has resulted in extremely high phosphorus levels. Could this impact the availability of other nutrients?
Yes. Phosphorus is adsorbed to soil minerals in a stronger fashion than sulfur, so excessive phosphorus reduces sulfur efficiency as more sulfur is displaced via leaching. The organic phosphorus in litter may also...
Dec 14, 2016
Is the lower salt index of ammonium sulfate the reason why it is a safer fertilizer than urea?
Not exactly, since you would need to compare salt index per unit of nutrient (3.25 for ammonium sulfate, 3.06 for ammonium nitrate and 1.62 for urea). The reason urea is not recommended for starter fertilization is due...
Sep 16, 2016
How does the salt index of ammonium sulfate compare to that of ammonium nitrate or urea?
The salt index values for the fertilizers in question are: Ammonium sulfate = 68.3 Ammonium nitrate = 104 Urea = 74.4
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