The answer: With some explanation from Dr. Dave Franzen, NDSU Soils Specialist and some research, it appears that despite the name – ammonium thiosulfate, ATS does NOT contain sulfate! Both methods apply some sulfur to the crop but on a crop removal basis would only be a small percentage of what is being removed. Eventually tetrathionate is converted to sulfate, which is the form of S taken up by plants. West Lafayette, IN 47907, An equal access/equal opportunity university. This is the result of the replacement of an ammonium ion in the sulfate and selenate media by a sodium ion in the sodium thiosulfate solution. Ammonium sulfate has more sulfur availability than ammonium thiosulfate. However, the inhibitory properties of ATS are not considered as good as products specifically sold to target urea hydrolysis and nitrification, such as NBPT or nitrapyrin. Purdue University
This may add some insight of “why”. In this form it does not act as the pure sulfate ion. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. Complete conversion of thiosulfate to sulfate may take 1-4+ weeks at temperatures typically encountered at planting and sidedressing time. They are also considering using liquid ammonium thiosulfate as a substitute because it is cheaper but want to know if weed control would be better than AMS? Answer: Weed scientists at Kansas State University compared AMS to ATS and found ATS was less effective as AMS at conditioning water and enhancing glyphosate. The thiosulfate difference Fourier also shows a distinct, localized conformational change involving residues 71, 72 and 249. Ammonium Thiosulfate (ATS 12-0-0-26S) ATS is a standard product of the U.S. fluid fertilizer industry. In addition, the discarded solutions produce a large amount of salts (ammonium thiocyanate, ammonium thiosulfate, and ammonium sulfate) that are left over after desulfurization, decyanation, and purification methods in coke oven gas, which have been demonstrated to be harmful. In ammonium thiosulfate, by contrast, only half of its sulfur becomes immediately available upon application to the soil, with the … This site is supported in part by the Crop Protection and Pest Management Program [grant no. Subscribe to receive weekly PDF via e-mail, Subscribe to a feed of individual articles, Ammonium Thiosulfate (ATS) as an Ammonium Sulfate (AMS) Replacement. Presently he is considering inducting liquid AMS versus handling the dry product this year for their post work which is a fair amount of work currently with the dry bags. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Sulfur response trials have shown ATS to be an effective S fertilizer, however, thiosulfate and its first breakdown product, tetrathionate, are not utilized by plants. Considerable variation in conversion rate exists among soils, but the soil factors affecting conversion have not been well identified. Ammonium thiosulphate increased maize grain yield in one case, decreased it in another, and had no effect in other comparisons. The question has been asked: “Why are they not the same?” or even, “Why is not ATS better than AMS since it contains more sulfate?”. If you have trouble accessing this page because of a disability, please contact Pest&Crop newsletter at [email protected]
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Ammonium thiosulfate is a colorless crystalline solid, soluble in water but less soluble in organic solvents. It tends to decompose to ammonium sulfite and sulfur at high temperatures. Ammonium thiosulfate (ATS) is commonly added to liquid nitrogen (N) solutions to provide sulfur (S) to crop plants. Even though sulfate availability is delayed with ATS, is should not be considered a “slow-release” fertilizer because sulfate, thiosulfate, and tetrathionate are all mobile in soil. Ammonium thiosulfate (ATS) is commonly added to liquid nitrogen (N) solutions to provide sulfur (S) to crop plants. 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): All of the sulfur in ammonium sulfate is in the immediately plant-available sulfate form. The answer: With some explanation from Dr. Dave Franzen, NDSU Soils Specialist and some research, it appears that despite the name – ammonium thiosulfate, ATS does NOT contain sulfate! AMS per 100 gallons of water as a water conditioner. ATS: Ammonium Thiosulfate. Feel free to use and share this content, but please do so under the conditions of our, Ammonium Thiosulfate (ATS) as an Ammonium Sulfate (AMS) Replacement (06/01/17), NDSU Crop & Pest Report - September 24, 2020, NDSU Crop & Pest Report - September 10, 2020, NDSU Crop & Pest Report - August 27, 2020, NDSU Crop & Pest Report - August 13, 2020.