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Fluid Journal : Fluid Journal 2002-2004
3 Fluid Journal Winter 2002 Agrotain® approached the nitrogen fertilizer efficiency of UCAN--21 only when nitrogen was applied in excess (150 lbs/A). To test further this hypothesis, a no-till study was conducted on wheat at the University of Tennessee (Fig- ure 2). Fertilizer sources were ammo- nium nitrate, UAN-32, and UCAN-23 (23-0-0-4Ca) applied at incrementally increasing rates of 30 lbs/A of N. It is interesting to note that UCAN-23 per- formed as well as and often superior to ammonium nitrate, the preferred nitrogen source for no-till cultivation. UCAN-23 achieved optimal economic yield at 60 lbs/A of N. Ammonium nitrate and UAN required 90 to 120 lbs/A of N, respectively, to produce similar yields. Minimally, nitrogen application rate could be reduced by 30 lbs/A of N with UCAN-23 and pro- duce the same economic yield as other sources. Also, from an environmental point of view, judicious nitrogen man- agement, coupled with yield optimiza- tion, is the goal of the fertilizer indus- try. Mixing two fertilizers to reduce nitrogen loss is very appealing. Cal- Yield - bu/A 95 90 85 Ammonium Nitrate UAN 32 UCAN 23 80 75 70 65 30 60 90 N - lbs/A 120 150 Figure 2. Wheat grain yield by N fertilizer source and rate. cium, therefore, plays a vital role in urea/nitrogen fertilizer efficiency. Dr. Easterwood is national agronomy manager at Hydro Agri North America, Inc., Tampa, Florida.
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