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Fluid Journal : Spring 2015
12 The Fluid Journal Spring 2015 Committee. The purpose of RQT for Hard Red Winter Wheat (HRWW) is to provide specific quality goals for the breeding community, water producers, and marketing programs in order to assist and guide the decisions needed to maintain the consistency and end-use quality of the U.S. HRW market class. Variables are: • Test Weight > 60 lb/bu-1 • Protein > 12.0 • Mixing tolerance: ranked value with a score from 0-6; values above 3 are preferred • Mix time: 3 to 5 minutes • Loaf Volume > 850 cc Flour yield was also measured. The greater the percent yield the better. 2011 crop year The 2011 crop year was characterized by a late spring warm-up with good winter moisture but a dry spring with below average relative humidity levels during the FL and PA application window. Yields. At both locations the yield of the check was not significantly different from any other treatment documenting a non- responsive crop season. Yields at Lahoma, however, were significantly higher than LCB with ranges of 4.0 to 5.4 Mg ha-1 and 1.7 to 2.2 Mg ha-1 respectively. Protein. While yield was not affected at either location, protein was increased above the non-fertilized control at LCB. There was no significance in protein at Lahoma across all 14 treatments and no significant differences in protein at LCB for any treatment that received fertilizer N. At Lahoma, the 13.4 kg N ha-1 PA application resulted in the highest protein content. Five of the six treatments with the highest protein content at LCB were PA applications. Baking/milling. Of the baking and milling qualities measured, only mixing tolerance was impacted by the late-season N applications at Lahoma, with all UAN treatments resulting in significantly higher values than CoRoN at 3.67 and 2.94, respectively. Loaf volume. At LBC, loaf volume was the only variable significantly impacted. All late-season N treatments resulted in a 55cc increase in loaf volume over the fertilizer control. Samples. All samples fell below the 850cc target. 2012 crop year The 2012 crop year was characterized by good soil moisture through winter and the onset of a severe drought in June. Early spring temperatures and relative humidity values were above average; however, May Figure 1. The deviation from 2000 to 2014 average of plant available water (inches) in the top 16 inches of soil profile for the Lahoma Research Station in 2011, 2012, and 2013. Figure 2. The deviation from 2000 to 2014 average of daily air temperature (degrees F) for the Lahoma Research Station in 2011, 2012, and 2013. saw relative humidity values drop below the long-term average. Yields. The favorable spring weather led to slightly higher maximum yields at Lahoma and significantly high maximum yields at LCB, with ranges of 3.9 to 5.9 Mg ha-1 and 1.8 to 3.9 Mg ha-1, respectively. Protein. At both locations, the majority of the treatments increased protein levels above that of the fertilized controls. At Lahoma the 13.4 kg N ha-1 rate of CoRoN applied PA was the only treatment that was statistically higher than the fertilizer control, while 13.4 and 26.8 kg N ha-1 UAN applied atFL,aswellasthe26.8kgNha-1UAN applied PA treatments, all had statistically higher protein content. A comparison of N source at LCB showed that UAN had a significantly higher protein level at 11.58 percent than CoRoN had at 11.18 percent. Mix time. The same trend was seen in mix time as the average mix time of treatment receiving UAN was longer than that for those receiving CoRoN. Flour yield was significantly impacted by timing of application. Treatments receiving N at PA had an average yield of 72.9 percent while those receiving N at FL had an average yield of 72.2 percent. 2013 crop year As was previously mentioned, all samples were damaged in transport to the lab in Manhattan KS. Therefore, the only variables that can be reported are yield and test weight. The 2013 crop year was characterized by an extremely dry winter with the month of March bringing below normal temperatures, timely rains, and average relative humidity. Yields. The poor winter with a following favorable spring led to average yields at Lahoma and LCB, with ranges of 4.0 to 4.9 Mg ha-1 and 3.2 to 3.8 Mg ha-1, respectively. It is hypothesized that