Jared A. Spackman
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View article: Optimizing small grain forage yield, nutrient composition, and economics via strategic harvest timing
Optimizing small grain forage yield, nutrient composition, and economics via strategic harvest timing Open
The impact of harvest timing on forage yield, nutritional composition, regrowth potential, and economic return was assessed for three awnless forage barley ( Hordeum vulgare L.) (Hays, Haybet, Lavina) and oat ( Avena sativa L.) varieties (…
View article: Irrigated spring hull‐less food barley response to nitrogen fertilization
Irrigated spring hull‐less food barley response to nitrogen fertilization Open
Barley ( Hordeum vulgare L.) is used mainly for malting, brewing, and animal feed. In antiquity, barley was a major calorie source for humans and has recently become of increased interest as consumers seek healthier options. Hull‐less barl…
View article: Efficacy, crop response, and economics of alternatives to glyphosate for pre‐plant weed control in small grains
Efficacy, crop response, and economics of alternatives to glyphosate for pre‐plant weed control in small grains Open
The value of glyphosate to growers practicing minimum or no‐till farming has been primarily a function of three factors: broad‐spectrum weed control, little to no carryover effect, and cost effectiveness. A 2‐year field study was conducted…
View article: Models and sufficiency interpretation for estimating critical soil test values for the Fertilizer Recommendation Support Tool
Models and sufficiency interpretation for estimating critical soil test values for the Fertilizer Recommendation Support Tool Open
Soil test correlation determines whether a soil test can be used to predict the need for fertilization based on the critical soil test value (CSTV). Our objectives were to compare the CSTV estimated from five combinations of correlation mo…
View article: Corn <sup>15</sup>N uptake and partitioning in response to fertilizer application rate and timing
Corn <sup>15</sup>N uptake and partitioning in response to fertilizer application rate and timing Open
Nitrogen (N) fertilizer applications near the time of planting are important for upper US Midwest corn ( Zea mays L.) production, but wet springs may result in significant N losses. Split applications may circumvent this problem and improv…
View article: Urea ammonium nitrate as the carrier for preplant burndown herbicides
Urea ammonium nitrate as the carrier for preplant burndown herbicides Open
Preplant weed control is a common practice for many small grain farmers. The timing of these applications often coincides with starter nitrogen (N) fertilizer application. Co‐application of the herbicides and N fertilizers, such as urea‐am…
View article: Professionalism in Physician Assistant Education as a Predictor of Future Licensing Board Disciplinary Actions
Professionalism in Physician Assistant Education as a Predictor of Future Licensing Board Disciplinary Actions Open
Purpose The purpose of this study was to evaluate associations between postgraduate disciplinary actions (PGDA) by state licensing boards and physician assistant (PA) school documented professionalism violations (DPV) and academic probatio…
View article: Capture efficiency of four chamber designs for measuring ammonia emissions
Capture efficiency of four chamber designs for measuring ammonia emissions Open
Ammonia (NH 3 ) emissions are an economically and environmentally significant loss pathway of fertilizer and soil‐derived N. Chambers are a commonly used method to quantify NH 3 emissions in plot‐scale agricultural research. Although this …
View article: Fate Of Pre-Plant And Split-Applied 15Nitrogen Enriched Urea In Corn
Fate Of Pre-Plant And Split-Applied 15Nitrogen Enriched Urea In Corn Open
University of Minnesota Ph.D. dissertation. September 2020. Major: Land and Atmospheric Science. Advisor: Fabian Fernandez. 1 computer file (PDF); xiii, 146 pages.
View article: Nitrogen Fertilizer Rate, Source, And Application Timing Effects On Soil Nitrogen And Corn Yield
Nitrogen Fertilizer Rate, Source, And Application Timing Effects On Soil Nitrogen And Corn Yield Open
University of Minnesota M.S. thesis.May 2018. Major: Land and Atmospheric Science. Advisor: Fabian Fernandez. 1 computer file (PDF); xii, 93 pages.