127-11 Soil N Dynamics As Affected by Band-Injected UAN with and without Instinct™ Nitrogen Stabilizer.



Monday, October 17, 2011
Henry Gonzalez Convention Center, Hall C, Street Level

Blucher Menelas, Brad Joern and James Camberato, Purdue University, West Lafayette, IN
Nitrification is the leading pathway toward losses of anthropogenic or soil N as it is the precursor of leaching and denitrification. Laboratory studies were conducted with three soil types differing in texture and organic matter content to quantify the effectiveness of a newly developed nitrification inhibitor (Instinct™) in delaying nitrification. The treatments included no UAN (control) and UAN with and without Instinct were injected into the center of each container with a syringe. The containers were replicated three times, arranged in a randomized complete block design in the growth chamber, and incubated in the dark for 63 days at a temperature regime that mimics spring temperatures in west central Indiana (2 weeks at 12 oC, 2 weeks at 17 oC, and 5 weeks at 22 oC). Soil samples were obtained from three different concentric zones around the injection point at 14, 28, 42, 56, and 63 days after treatment application. The effect of Instinct™ on the concentration gradient of ammonium and nitrate across soil types, concentric zones and time will be discussed.
See more from this Division: S04 Soil Fertility & Plant Nutrition
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