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Fluid Journal : Fluid Journal 2002-2004
Early Spring 2004 Fluid Journal 2 the N required for onion development leaches away from the root zone. His studies have shown that with CRN there is extended N availability within onion beds. Fall Bedding Fall bedding is a common practice in the Treasure Valley onion production areas of Idaho and Oregon. Dr. Brad Brown, University of Idaho, and Lynn Jensen, Oregon State University, have evaluated the applicability of various combinations of CRN and soluble N. Dr. Brown's efforts emphasized that the most productive, efficient source of N, as well as the greatest opportunity for producing high-quality onions, was a combination of fall-applied CRN and sidedressed N. The remaining 50 percent of required N would be applied as a single sidedress of soluble N applied the first part of June as UAN. These efforts showed improved yield, quality, and economic potential when using CRN in the Treasure Valley. Dr. Brown's work can be easily applied to most furrow-irrigated onions. Jensen conducted similar work. Figure 1 is a composite of a three-year study ('00 to '02) by Dr. Brown. It depicts the strength of the combination of CRN and commercial N on onion production in Parma, Idaho. Other Combinations Dr. Dwayne Westfall of Colorado State University has shown growers how incorporating a portion of their total N as CRN would have the potential of increasing both yield and quality in the onion production areas of Ft. Morgan, Colorado. Dr. Westfall created blends that combined the immediately available and lower cost soluble N with high, efficient CRN. The result was both higher yields and quality compared to growers using soluble N forms alone. Kris Yano has been using a percentage of CRN with in-season N with good results on his farm located in Treasure Valley. The CRN coatings allow N to remain available until about the first of June. He can then make a single sidedress application of UAN for the remaining N. This technique had proven effective under a variety of growing conditions. Dr. Tindall is senior agronomist for J. R. Simplot Company. Figure 1. Effect of CRN combined with commercial N on onion production, Parma, Idaho. GSP + Grower Standard Practice; U100 = Urea at 100 lbs/A; and SD = Sidedress
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