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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.
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:: -parameter sigmoid function to estimate net N mineralized: Nmin = a/(1+exp(-(x-x0)/b)) where: Nmin

Creator:: Andrews, Nicholas, Sullivan, Dan M., and Pool, Kristin
Abstract:: Organic vegetable growers rely on legume cover crops as an economical source of plant-available N. This research evaluated N contributions to summer vegetable crops by cover crops (CC) residues by monitoring soil nitrate (NO3-N) concentrations during the summer crop growing season. Replicated field plots were established with three CC mixes:...
Resource Type:: Presentation
Full Text:: termination in spring MF MSF PMF SSF WUG MF MSF NWREC SSF C ov er c ro p N u pt ak e (lb /a cr e

Creator:: Andrews, Nicholas, Sullivan, Dan M., and Pool, Kristin
Abstract:: Organic vegetable growers rely on legume cover crops as an economical source of plant-available N. This research evaluated N contributions to summer vegetable crops by cover crops (CC) residues by monitoring soil nitrate (NO3-N) concentrations during the summer crop growing season. Replicated field plots were established with three CC mixes:...
Resource Type:: Conference Proceeding
Full Text:: with three CC mixes: solo common vetch (V), phacelia + V (PV), and cereal rye + V (RV), plus a winter

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

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