Wilson, Tracy

Evaluation of N Fertilizer Rate and Timing on Wheat Yield

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Series/Report number: 
COARC2015
Abstract: 
This project sought to evaluate the effects of N rate and timing on yield and grain protein content in irrigated winter wheat grown in central Oregon. Currently, many wheat producers in the area apply N fertilizer in the fall, rather than in the spring, due to logistical concerns of weather, soil moisture, and workload. By evaluating the effect of fall and spring applications of N, we aim to provide guidance for growers on when to apply N fertilization in an effort to maximize grain yield. Large-scale plots were used to assess N rate and timing effects on grain yield, test weight and protein percentage. To trace the fate of fertilizer N, 15N labeled urea was applied to micro-plots in fall and spring, and soil and biomass samples were collected and analyzed to track recovery of the 15N labeled urea. Winter wheat grain yield for 2013-14 and 2014-15 where soil test N was high was largely unresponsive to N fertilization. The labeled 15N urea was recovered primarily from the top six inches of soil and losses ranged from 0 to 30% in 2013-14. Winter wheat response to N fertilization in central Oregon is highly variable likely due to variation in soil depths and textures as well as soil N supply related to crop rotation.

Managing Straw Residue Without Burning

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Series/Report number: 
COARC2015
Abstract: 
Managing straw residue with fire is an effective tool for growers. However, as tourism thrives and drought becomes more prevalent, increased restrictions and negative publicity surround open field burning. With so many limitations on burning, both legal and weather, it is not unlikely that there will be times when burning fields to control straw residue will not be possible. Therefore, it is imperative that growers have effective and economical alternatives to burning available for straw residue management in fields. Many products are available to producers that claim to aid in residue degradation yet no research is available to validate their efficacy for straw residue management. This project will evaluate straw residue management alternatives in comparison with burning to determine whether these microbial products or other management practices are suitable replacements for burning straw residue.

Foliar Boron Fertilizer Application and Timing in Hybrid Carrot Seed Production

Hybrid European Nantes carrot seed production can be challenging for growers as yields can be unreliable. Demand for boron (B) in many crops is greatly elevated during flowering and seed set even when B in the plant leaves are in the “adequate” range for that crop. Several studies have found that foliar B applications can increase fruit set and yield (Nyomora et al,. 1999; Perica et al., 2001; Asad et al., 2003). Research conducted on alfalfa seed found that foliar B applications increased seed yield even though B concentrations in the plants and soil were considered adequate for alfalfa forage production (Dordas, 2006). The objective of this research project was to determine what effect foliar B application and application timing had on hybrid carrot seed production.
Series/Report number: 
COARC2016
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