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Fluid Journal : Winter 2014
7 The Fluid Journal Winter 2014 Figure 3. Fertilizer N source effect on spring wheat protein yield, Patton, WTARC, and WARC, 2012. The means in the same group followed by the same letter are not significantly different, p<0.05. Figure 4. Fertilizer N source effect on NUE, Patton, WTARC, and WARC, 2012. The means in the same group followed by the same letter are not significantly different, p<0.05. Agricultural Research Center (WARC) near Corvallis, MT using Choteau spring wheat. At each location, treatment structure reported in Table 1 was employed. Treatment 1 was established as an unfertilized check plot. Preplant N rate of 90 kg N ha-1 was applied as side-banded urea. At growth stage Feekes 5, topdress N was foliar- applied with an ATV-mounted stream bar sprayer using three N sources: UAN, liquid urea, and NRG. Topdress rate of 45 kg N ha-1, and 3 dilution rations of 100/0, 66/33, and 33/66 (fertilizer %/water %) were evaluated. Because NRG contains S, Fe, Mg, Mn, and Zn, soil analysis was used to ensure that any one of these nutrients is not deficient and can be corrected prior to topdress application. Each treatment was replicated four times. Plot size was 1.5 m by 7.6 m. Grain yield and protein content were determined at harvest. Nitrogen use efficiency was determined using “the difference method” by deducting the total N uptake in wheat from the