What are the advantages of ammonium sulfate versus ammonium thiosulfate?
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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. Check out the questions asked below or ask your own question.
What are the advantages of ammonium sulfate versus ammonium thiosulfate?
Ammonium sulfate and ammonium thiosulfate, also known as ATS, are both very common nitrogen and sulfur sources in the dry and liquid fertilizer markets. From an agronomic point of view, I can think of a couple of advantages of ammonium sulfate (21-0-0-24S) when compared to ammonium thiosulfate solution (12-0-0-26S):
Comments
Mercedes,
Is there any type of time frame you could guesstimate that it takes the elemental 1/2 of ATS to become available for plant uptake?
Keith
Good question, Keith. The oxidation rate of elemental sulfur from a liquid application of ATS would depend on the same factors affecting the oxidation of powder elemental sulfur. Notice I specify “powder” elemental sulfur, since the oxidation of “granular” elemental sulfur would also be influenced by the so-called “locality effect”. Those factors include oxidizing bacterial activity and conditions that affect them, notably temperature and soil pH. To cite one example, in a study by the International Fertilizer Development Center in Muscle Shoals, AL, oxidation of powder elemental sulfur applied to a sandy soil with a pH of 5.3 took about 6 weeks. If we assume the same soil but colder conditions, oxidation would take longer. In summary, when it comes to agronomic effectiveness of sulfur sources, they would follow this order:
AS ≥ liquid ATS > granular ES or (ES+AS) products
As soon as you have a soil environment favoring sulfur oxidation, it should take place rather fast.