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Effect of Ammonium Thiosulfate and Liquid Fertilizer Droplet Size on Urea Hydrolysis

Department of Soil Science, Walster Hall, P.O. Box 5638, North Dakota State Univ., Fargo, ND 58105. Research support was provided by the TVA, The Sulphur Inst., Arcadian, and Texas Sulfur Products. Published with the approval of the director, North Dakota Agric. Exp. Stn. as Journal Series no. 1612.

* Corresponding author.

ABSTRACT

Ammonium thiosulfate (ATS, 12-0-0-26S) has recently been shown to inhibit soil urease when mixed with liquid fertilizers such as urea-ammonium nitrate (UAN). The purpose of this research was to investigate the effects of soil water content (field capacity and wilting point), liquid fertilizer droplet size (0.01, 0.1, and 0.5 mL), and ATS addition to UAN (0 and 5% vol/vol) on urea hydrolysis by two soils incubated at 20 °C. Soil types were a Fargo silty clay (Vertic Haplaquolls) and an Embden loamy sand (Pachic Udic Haploborolls). Urea hydrolysis by both soils was slower at wilting point than at field capacity, and increasing the fertilizer droplet size further slowed urea hydrolysis. Adding ATS to UAN inhibited urea hydrolysis by both soils at both water contents. In general, the inhibitory effect of ATS on urea hydrolysis was greater than obtained by increasing droplet size. The inhibitory effect of ATS on urea hydrolysis was strongest at wilting point and with larger fertilizer droplet sizes. ATS was more effective in inhibiting urea hydrolysis in the Embden soil than the Fargo soil. Hence, the effect of ATS on soil urease will depend on how the fertilizer is applied and on environmental conditions after application.

Key Words: Urea-ammonium nitrate • Urease inhibitors • Soil water content

Received for publication March 27, 1987.

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