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Fluid Journal : Fluid Journal 2005-2007
FALL 2007 Fluid Journal 19 Figure 2. Rice grain yield response when comparing no mid-season N to 46 lbs/A of mid-season N. Data are responses to midseason N averaged across all N rates and application methods. 137 151 130 135 140 145 150 155 0 46 Midseason N Rate (lb/a) bu/A Now on the Internet and Cataloged All articles published in the Fluid Journal. Click on and pass on valuable information to your customers! www.fluidfertilizer.com of fluid technology as an alternative N source for rice. Fluids shine For the factorial combination of treatments, grain yield was greatly affected by an interaction among N rate, source, and MS rate in our studies. Rice grain yields were greatest when fluid N source was banded at planting at rates of 150 and 180 lbs/A. Rice grain yields were not different across N rates when granular urea was broadcast and incorporated immediately prior to planting. However, yield for all granular urea applications broadcasted at planting were inferior to banded fluid applications (Figure 1). When averaged across at-planting N rates, grain yields were increased when a MS N application of 46 lbs/A was applied (Figure 2). Banded fluid N applications at the rate of 150 and 180 lbs/A with a MS application of 46 lbs/A produced grain yields and net returns statistically equal to a standard PF application of 150 lbs/A either as a granular or a fluid and a standard PF application of 120 lbs/A followed by a MS application of 46 lbs/A (Table 1). Conclusions As the margin between inputs and returns has decreased, growers are forced to evaluate their production practices. If technology allows, considerable savings could be realized in reducing fertilizer application costs. The data indicate that fluid fertilizer technology has potential to be adopted into rice cultural practices either by applying N at planting or by applying it with ground applicators immediately prior to flood establishment. For farms that have precision-leveled fields, the latter may be more feasible. However, for contour-levee fields, banding fluids at planting may be a viable option. Nitrification inhibitors still should be evaluated further for planting applications because the time lag between planting and flooding can be up to six weeks. Furthermore, the practice of broadcasting granular urea just prior to planting is not feasible, even though application costs are less. Drs.Walker and Bond are assistant research professors, Dr. Martin is associate extension professor, and Dr. Buehring is assistant extension professor at Mississippi State University.
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