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Creator:: Hart, John M., Horneck, Donald A., Sullivan, Dan M., and Christensen, Neil W.
Abstract:: Nitrogen can be lost when the quantity of available nitrogen exceeds crop demand or nitrogen availability is not in synchrony with crop demand. Either situation results in accumulation of available nitrogen, primarily in the nitrate form, at the end of the growing season. Over-winter nitrogen loss occurs primarily as nitrate-...
Resource Type:: Conference Proceeding
Full Text:: th , i nc he s G ro w th , l b/ a/ da y N itr og en U pt ak e, lb /a /d ay

Creator:: Sullivan, Dan M., Bary, Andrew I., Cogger, Craig G., and Shearin, Todd E.
Abstract:: Predicting agronomic rates is important to derive optimum economic and environmental benefits from biosolids fertilizer applications. We conducted this research to 1) evaluate dryland wheat response to biosolids applications over a range of climate zones in the Pacific Northwest and 2) compare agronomic application rates predicted from yield curves with...
Resource Type:: Conference Proceeding
Full Text:: of plant-available N) was the result of loss of profile N by leaching during a wet crop-year. At S

Creator:: Sullivan, Dan M.
Abstract:: Computer simulation models provide insight into ammonia loss processes and the sensitivity of ammonia loss predictions to environmental and management variables. As an example of how a simple computer simulation model can inform the Extension guideline development process, the ALFAM (Ammonia Volatilization from Field-Applied Animal Slurry) model was used to...
Resource Type:: Conference Proceeding
Full Text:: MANAGEMENT EFFECTS ON AMMONIA LOSS: A COMPUTER SIMULATION MODELING APPROACH Dan M. Sullivan Dept. Crop

Creator:: Sullivan, Dan M., Cogger, Craig G., Bary, Andrew I., and Myhre, Elizabeth
Abstract:: Credits for available N from past manure applications are often used in nutrient management planning. However, it is difficult to verify the accuracy of these credits. The major objective of this study was to estimate long-term effects of manure application on soil N mineralization. Specific objectives were to: 1) estimate...
Resource Type:: Conference Proceeding and Presentation
Full Text:: non-manured soils D. M. Sullivan*, A. I. Bary, C. G. Cogger and E. A. Myhre. D. M. Sullivan

Creator:: Heinrich, Aaron and Sullivan, Dan M.
Abstract:: Following the surface application of urea to soil, there is the potential for nitrogen (N) loss from ammonia (NH3) volatilization until sufficient rain or irrigation has moved it into the soil. Many studies measuring NH3 loss have used laboratory and microplot field studies. The limitation of these techniques is that...
Resource Type:: Conference Proceeding
Full Text:: Citation: Heinrich, A. and D.M. Sullivan. 2017

Creator:: Sullivan, Dan M., Peachey, Ed, and Donaldson, Andrew
Abstract:: Specialty organic fertilizers used in organic vegetable production are expensive. So, from environmental and economic perspectives, growers want to maximize nitrogen (N) fertilizer use efficiency by the crop. This research was conducted to (1) determine sufficient N fertilizer rates for organic broccoli, (2) evaluate the efficacy of a specialty organic...
Resource Type:: Presentation
Full Text:: (Cascadia) • Evaluate efficacy of a specialty organic fertilizer (feather meal; 12-0-0) – sidedress vs

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