Selected Refereed Journal Articles (65 total since 2003)
  1. Ordóñez, R. A., White, C. M., Spargo, J. T., Kaye, J. P., Ruark, M., Iqbal, J., Shapiro, C. A., Thomason, W. E., Fiorellino, N. M., Thorne, L. A., Shober, A., Grove, J. H., Hirsh, S. M., Weil, R. R., Castellano, M. J., Archontoulis, S. V., Hatfield, J. J., Lee, C. D., Quinn, D. J., … Vyn, T. J. (2025). Delta yield predicts nitrogen fertilizer requirements for corn in US production systems. Agronomy Journal, 117, e70150. https://doi.org/10.1002/agj2.70150
  2. Pokhrel, S., Blew, W., Shober, A. L., & Miller, J. O. (2025). Evaluating routine agronomic soil tests for coastal soil salinity detection in the Mid-Atlantic. Soil Science Society of America Journal, 89, e70075. https://doi.org/10.1002/saj2.70075 
  3. Pokhrel, S., Thomason, W. E., Shober, A. L., & Maguire, R. O. (2025). Evaluating adequacy of corn nitrogen recommendations in long term cover cropping systems. Agrosystems, Geosciences & Environment, 8, e70150. https://doi.org/10.1002/agg2.70150 
  4. Gatiboni, L., Shober, A. L., Fiorellino, N., Osmond, D., & *Mosesso, L. R. (2025). Drawdown of soil phosphorus by crop removal: A meta-analysis of 56 fields with interrupted fertilization. Agricultural & Environmental Letters, 10, e70007. https://doi.org/10.1002/ael2.70007  
  5. Thompson, J., Buda, A., Shober, A., Ntarlagiannis, D., Collick, A., Kennedy, C., *Mosesso, L., Reiner, M., Triantafilis, J., Pokhrel, S., & Slater, L. (2025). Electrical geophysical monitoring of subsurface solute transport in low-relief agricultural landscapes in response to a simulated major rainfall event. Journal of Hydrology, 343, Article 132313. https://doi.org/10.1016/j.jhydrol.2024.132313
  6. Shober, A. L., Simpson, Z. P., Jarvie, H. P., Macrae, M. L., Kleinman, P. J. A., Haygarth, P. M., Kulesza, S., Gatiboni, L., & Davies, J. (2024). Towards a transdisciplinary and unifying definition of legacy phosphorus. Journal of Environmental Quality, 1–11. https://doi.org/10.1002/jeq2.20659 
  7. Mosesso, L. R., Reiter, M. S., Scheckel, K. G., Toor, G. S., & Shober, A. L. (2024). Phosphorus speciation in manure and fertilizer impacted Mid-Atlantic coastal plain soils. Journal of Environmental Quality, 53(3), 352-364. https://doi.org/10.1002/jeq2.20556 
  8. Macrae, M. Kleinman, P., Osmond, D., Shober, A., & Nelson, N. (2024). The importance of consensus science to managing phosphorus in the environment: SERA-17 and the legacy of Andrew Sharpley. Journal of Environmental Quality, 1–9. https://doi.org/10.1002/jeq2.20546 
  9. Miller, J. O., Shober, A. L., & Taraila, J. (2024).  Estimating cover crop biomass and nitrogen content through drone imagery. Agronomy Journal. 1–11. https://doi.org/10.1002/agj2.21554 
  10. Mosesso, L. R., & Shober, A. L. (2023). Soil health tradeoffs may be minimal in phosphorus-enriched Coastal Plain soils. Agricultural & Environmental Letters, 8, e20101. https://doi.org/10.1002/ael2.20101 
  11. Reike, E. L.  Bagnall, D. K., Morgan, C. L. S., Flynn, K. D., Howe, J. A., Greub, K. L. H., Mac Bean, G., …Shober, A. L., … & Honeycutt, W. (2022). Evaluation of aggregate stability methods for soil health. Geoderma, 428, 116156. https://doi.org/10.1016/j.geoderma.2022.116156 
  12. Lucas, E. R., Mosesso, L. R., Roswell, T., Yang, Y., Scheckel, K., Shober, A. L., & Toor, G. S. (2022).  X-ray absorption near edge structure spectroscopy reveals phosphate minerals in agricultural soils saturated with legacy phosphorus. Chemosphere, 308, 136288. https://doi.org/10.1016/j.chemosphere.2022.136288 
  13. Kleinman, P. J. A., Osmond, D. O., Christianson, L. E., Flatten, D. N., Ippolito, J. A., Jarvie, H. P., Kaye, J. P., King, K. W., Leytem, A. B., McGrath, J. M., Nelson, N. O., Shober, A. L., Smith, D. R., Staver, K. W., & Sharpley, A. N. (2022). Addressing conservation practice limitations and tradeoffs for reducing phosphorus loss from agricultural fields. Agricultural & Environmental Letters, 7, e20084. https://doi.org/10.1002/ael2.20084 
  14. Miller, J. O., Shober, A. L., & VanGessel, M. J. (2022). Post-harvest drone flights to measure weed growth and yield associations. Agricultural & Environmental Letters, 7, e20081. https://doi.org/10.1002/ael2.20081 
  15. Liptzin, D., Norris, C. E., Cappellazzi, S. B., Mac Bean, G., Cope, M., Greub, K. L. H., Rieke, E. L., … Shober, A. L., … & Honeycutt, W. (2022). An evaluation of carbon indicators of soil health in long-term agricultural experiments, Soil Biology and Biochemistry, 172, 108708. https://doi.org/10.1016/j.soilbio.2022.108708 
  16. Rieke, E. L., Cappellazzi, S. B., Cope, M., Liptzin, D., Mac Bean, G., Greub, K. L. H., … Shober, A. L., … Honeycutt, C. W. (2022). Linking soil microbial community structure to potential carbon mineralization: A continental scale assessment of reduced tillage. Soil Biology and Biochemistry, 168, 108618. https://doi.org/10.1016/j.soilbio.2022.108618 
  17. Duke, J. M., Johnston, R. L., Shober, A. L., & Lui, Z. (2022). Barriers to cover crop adoption: Evidence from parallel surveys in Maryland and Ohio. Journal of Soil and Water Conservation, 77, 198–211. https://doi.org/10.2489/jswc.2022.00062 
  18. Duke, J. M., Johnston, R. L., Shober, A. L., & Lui, Z. (2022). Improving targeting of farmers for enrollment in agri-environmental programs. Applied Economic Perspectives & Policy, 1– 25. https://doi.org/10.1002/aepp.13227 
  19. Slaton, N. A., Lyons, S. E., Osmond, D. L., Brouder, S. M., Culman, S. W., Drescher, G., Gatiboni, L. C., Hoben, J., Kleinman, P. J. A., McGrath, J. M., Miller, R. O., Pearce, A., Shober, A. L., Spargo, J. T., & Volenec, J. J. (2022). Minimum dataset and metadata guidelines for soil-test correlation and calibration research. Soil Science Society of America Journal, 86(1), 19-33.  https://doi.org/10.1002/saj2.20338 
  20. Bagnall, D. K., Morgan, C. L. S., Mac Bean, G., Liptzin, D., Cappellazzi, S. B., Cope, M., … Shober, A. L., … & Honeycutt, C. W. (2022). Selecting soil hydraulic properties as indicators of soil health: Measurement response to management and site characteristics. Soil Science Society of America Journal, 86, 1206-1226. https://doi.org/10.1002/saj2.20428 
  21. Mosesso, L. R., Buda, A., Collick, A., Kennedy, C., Folmar, G., & Shober, A. (2021). Examining sources and pathways of phosphorus transfer in a ditch-drained field. Journal of Environmental Quality, 50(3), 680– 693. https://doi.org/10.1002/jeq2.20226 
  22. Fiorellino, N. M., Kratochvil, R. J., Shober, A. L., & Coale, F. J. (2021). Is starter phosphorus fertilizer necessary for corn grown on Atlantic Coastal Plain soils? Agrosystems Geosciences & Environment, 4(1), 1−8. https://doi.org/10.1002/agg2.20139 
  23. Robinson, J., Buda, A., Collick, A., Shober, A., Ntarlagiannis, D., Bryant, R., Folmar, G.,  Andres, A. S. & Slater, L. (2020). Electrical monitoring of saline tracers to reveal subsurface flow pathways in a flat ditch-drained field. Journal of Hydrology, 586, 124862. https://doi.org/10.1016/j.jhydrol.2020.124862 
  24. Duncan, E. W., Osmond, D. L., Shober, A. L., Starr, L., Tomlinson, P., Kovar, J. L., Moorman, T. B., Peterson, H. M., Fiorellino, N. M. & Reid, K. (2019). Phosphorus and soil health management practices. Agricultural & Environmental Letters, 4, 190014. https://doi.org/10.2134/ael2019.04.0014 – Awarded A&EL Best Paper 2021 
  25. Osmond, D. L., Shober, A. L., Sharpley, A. N., Duncan, E. W. & Hoag, D. L. K. (2019). Increasing the effectiveness and adoption of agricultural phosphorus management strategies to minimize water quality impairment. Journal of Environmental Quality, 48(5), 1204−1217. https://doi.org/10.2134/jeq2019.03.0114 
  26. Qin, Z., & Shober, A. (2018). The challenges of managing legacy phosphorus losses from manure-impacted agricultural soils. Current Pollution Reports, 4, 265–276. https://doi.org/10.1007/s40726-018-0100-1 
  27. Qin, Z., Shober, A. L., Scheckel, K. G., Penn, C. J. & Turner, K. C. (2018). Mechanisms of phosphorus removal by phosphorus sorbing materials. Journal of Environmental Quality, 47, 1232−1241. https://doi.org/10.2134/jeq2018.02.0064
  28. Shober, A. L., Buda, A. R., Turner, K. C., Fiorellino, N. M., Andres, A. S., McGrath, J. M. & Sims, J. T. (2017). Assessing Coastal Plain risk indices for subsurface phosphorus loss. Journal of Environmental Quality, 46, 1270−1286. https://doi.org/10.2134/jeq2017.03.0102 
  29. Qin, Z. X., Shober, A. L., Beeson, R. C., & Wiese, C. (2013). Nutrient Leaching from Mixed-Species Florida Residential Landscapes. Journal of Environmental Quality, 42(5), 1534-1544. doi:10.2134/jeq2013.04.0126
  30. Loper, S. J., Shober, A. L., Wiese, C., Denny, G. C., & Stanley, C. D. (2013). Nutrient Leaching during Establishment of Simulated Residential Landscapes. Journal of Environmental Quality, 42(1), 260-270. doi:10.2134/jeq2012.0098
  31. Nelson, N. O., & Shober, A. L. (2012). Evaluation of Phosphorus Indices after Twenty Years of Science and Development. Journal of Environmental Quality, 41(6), 1703-1710. doi:10.2134/jeq2012.0342
  32. Carey, R. O., Hochmuth, G. J., Martinez, C. J., Boyer, T. H., Nair, V. D., Dukes, M. D., …Shober, A. L.,  . . . Sartain, J. B. (2012). A Review of Turfgrass Fertilizer Management Practices: Implications for Urban Water Quality. Horttechnology, 22(3), 280-291. https://doi.org/10.21273/HORTTECH.22.3.280
  33. Loper, S., Shober, A. L., Wiese, C., Denny, G. C., Stanley, C. D., & Gilman, E. F. (2012). Organic Soil Amendment and Tillage Affect Soil Quality and Plant Performance in Simulated Residential Landscapes (vol 45, pg 1522, 2010). Hortscience, 47(7), 970-970. https://doi.org/10.21273/HORTSCI.45.10.1522
  34. Shober, A. L., Denny, G. C., & Broschat, T. K. (2010). Management of Fertilizers and Water for Ornamental Plants in Urban Landscapes: Current Practices and Impacts on Water Resources in Florida. Horttechnology, 20(1), 94-106. https://doi.org/10.21273/HORTTECH.20.1.94
  35. Shober, A. L., Wiese, C., Denny, G. C., Stanley, C. D., Harbaugh, B. K., & Chen, J. J. (2010). Plant Performance and Nutrient Losses during Containerized Bedding Plant Production Using Composted Dairy Manure Solids as a Peat Substitute in Substrate. Hortscience, 45(10), 1516-1521. https://doi.org/10.21273/HORTSCI.45.10.1516
  36. White, J. W., Coale, F. J., Sims, J. T., & Shober, A. L. (2010). Phosphorus Runoff from Waste Water Treatment Biosolids and Poultry Litter Applied to Agricultural Soils. Journal of Environmental Quality, 39(1), 314-323. https://doi.org/10.2134/jeq2009.0106
  37. Shober, A. L., & Sims, J. T. (2009). Evaluating Phosphorus Release from Biosolids and Manure-Amended Soils under Anoxic Conditions. Journal of Environmental Quality, 38(1), 309-318. https://doi.org/10.2134/jeq2007.0660
  38. Shober, A. L., & Sims, J. T. (2007). Integrating phosphorus source and soil properties into risk assessments for phosphorus loss. Soil Science Society of America Journal, 71(2), 551-560. https://doi.org/10.2136/sssaj2006.0253
  39. Shober, A. L., Stehouwer, R. C., & MacNeal, K. E. (2007). Chemical fractionation of trace elements in biosolid-amended soils and correlation with trace elements in crop tissue. Communications in Soil Science and Plant Analysis, 38(7-8), 1029-1046. https://doi.org/10.1080/00103620701280068
  40. Kleinman, P., Sullivan, D., Wolf, A., Brandt, R., Dou, Z. X., Elliott, H., . . .Shober, A. L.,. . . Zhang, T. Q. (2007). Selection of a water-extractable phosphorus test for manures and biosolids as an indicator of runoff loss potential. Journal of Environmental Quality, 36(5), https://doi.org/10.2134/jeq2006.0450
  41. Shober, A. L., Hesterberg, D. L., Sims, J. T., & Gardner, S. (2006). Characterization of phosphorus species in biosolids and manures using XANES spectroscopy. Journal of Environmental Quality, 35(6), 1983-1993.  https://doi.org/10.2134/jeq2006.0100
  42. Shober, A. L., & Sims, J. T. (2003). Phosphorus restrictions for land application of biosolids: Current status and future trends. Journal of Environmental Quality, 32(6), 1955-1964.  https://doi.org/10.2134/jeq2003.1955
  43. Shober, A. L., Stehouwer, R. C., & Macneal, K. E. (2003). On-farm assessment of biosolids effects on soil and crop tissue quality. Journal of Environmental Quality, 32(5), 1873-1880. https://doi.org/10.2134/jeq2003.187

University of Delaware Nutrient Recommendations

University of Delaware Extension Publications

  1. Miller, J. O., Pokhrel, S. & Shober, A. L. (2025). Regional soil tests to evaluate coastal field salinity. University of Delaware, Newark, DE.  
  2. Riggi, S. Y. & Shober, A. L. (2025). Know the value of manure: Manure sampling and analysis. University of Delaware, Newark, DE.
  3. Shober, A. L., Gartley, K. L., & Sims, J. T. (2025). Liming materials and management. University of Delaware, Newark, DE.
  4. Shober, A. L., Gartley, K. L., & Sims, J. T. (2025). A comparison of methods to determine lime requirement. University of Delaware, Newark, DE.
  5. Shober, A. L. & Riggi, S. Y. (2025). Adjusting nitrogen rate recommendations for agronomic, forage/hay, and vegetable crops in Delaware. University of Delaware, Newark, DE.
  6. Volk, J. & Shober, A. L. (2025). The impacts of nitrogen and phosphorus from agriculture on Delaware’s water quality. University of Delaware, Newark, DE. 
  7. Shober, A. L., Hansen, D., Binford, G., & Sims, J. T. (2025). End-of-season corn stalk nitrate testing to optimize nitrogen management. University of Delaware, Newark, DE.
  8. Pokhrel, S. & Shober, A. L. (2024). Maximizing the potential of poultry litter as a valuable nutrient source for sustainable crop production. University of Delaware, Newark, DE.
  9. Riggi, S. Y., Cartanza, G., & Shober, A. L. (2024). Litter management challenges on new poultry farms. University of Delaware, Newark, DE. (Original publication date 2023, updated 2024)
  10. Pokhrel, S., Shober, A. L., & Miller, J. O. (2023). Managing fall-planted cover crops for maximum benefit. University of Delaware, Newark, DE. 
  11. Shober, A. L., Gartley, K. L., & Sims, J. T. (2024). Measurement and management of soil pH for crop production in Delaware. University of Delaware, Newark, DE. (Original publication date 2019, updated 2024)
  12. Shober, A. L., Gartley, K. L., & Sims, J. T. (2025). Calculating the lime recommendation using the Adams-Evans Soil buffer. University of Delaware, Newark, DE. (Original publication date 2019, updated 2025)
  13. Riggi, S. Y., Cartanza, G., & Shober, A. L. (2025). Temporary mortality management on new poultry farms. University of Delaware, Newark, DE. (Original publication date 2018, updated 2025) 
  14. Shober, A. L., & Denny, G. C. (2025). Identifying nutrient deficiencies in ornamental plants. University of Delaware, Newark, DE. (Original publication date 2017, updated 2025)
  15. Shober, A. L., & Rothweiler. R. (2016). Basic tips for using the web soil survey to retrieve information for nutrient management planning. University of Delaware, Newark, DE.
  16. Shober, A. L., & Taylor, R. W. (2025). Estimating yield goal for crops. University of Delaware, Newark, DE. (Original publication date 2016, revised 2025)
  17. Shober, A. L. (2025). Phosphorus cycling in agriculture. University of Delaware, Newark, DE. (Original publication date 2015, revised 2025)
  18. Shober, A. L. (2025). Nitrogen cycling in agriculture. University of Delaware, Newark, DE. (Original publication date 2015, updated 2025)
  19. Shober, A. L. (2025). Delaware gardener’s guide to lawn and landscape fertilizers. University of Delaware, Newark, DE. (Original publication date 2015, updated 2025)
  20. Shober, A. L., & Riggi, S. (2025). Temporary field storage of poultry litter. University of Delaware, Newark, DE. (Original publication date 2015, updated 2025)
  21. Shober, A. L., Wiese, C., & Denny, G. C. (2025). Delaware gardener’s guide to soil pH. University of Delaware, Newark, DE.  (Original publication date 2015, updated 2025)
  22. Shober, A. L., & Taylor, R. W. (2025). Nitrogen management for soybean. University of Delaware, Newark, DE.  (Original publication date 2014, updated 2025)
  23. Shober, A. L., & Riggi, S. Y. (2025). Understanding the requirements of the Delaware nutrient management act. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  24. Shober, A. L., Gartley, K. L., & Sims, J. T. (2013). Nitrogen management for corn in Delaware: The pre-sidedress nitrate test. University of Delaware, Newark, DE. 
  25. Shober, A. L. (2025). Nitrogen removal by Delaware crops. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  26. Shober, A. L. (2025). Defining high phosphorus soils in Delaware. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  27. Shober, A. L., Sims, J. T., & Gartley, K. L. (2025). Interpreting soil phosphorus and potassium tests. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  28. Shober, A. L., & Sims, J. T. (2025). Soil management options based on the phosphorus site index. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  29. Shober, A. L., Sims, J. T., & Leytem, A. B. (2025). Phosphorus management strategies for Delaware’s agricultural soils: The phosphorus site index. University of Delaware, Newark, DE. (Original publication date 2013, updated 2025)
  30. Shober, A. L., Sims, J. T., & Walls, J. L. (2025). Phosphorus removal by Delaware crops. University of Delaware, Newark, DE. (Original publication date 2012, updated 2025)

Weekly Crop Update Articles 

  1. Miller, J. O., & Shober, A. L. (2024). Cover crop termination and growing degree days. Weekly Crop Update 32(4)
  2. Miller, J. O., & Shober, A. L. (2023). Cover crop burndown and corn stands. Weekly Crop Update 31(3)
  4. Miller, J. O., & Shober. (2024). Cover crop termination and growing degree days. Weekly Crop Update 32(4)
  5. Miller, J. O., & A. L. Shober. (2023). Cover crop burndown and corn stands. Weekly Crop Update 31(3)
  6. Miller, J. O., & A. L. Shober. (2022). Cover crop mixes will build biomass. Weekly Crop Update 30(22)
  7. Shober, A. L., Gartley, K. L., & Miller, J. O. (2022). Adjusting fertilizer recommendations in times of high input cost. Weekly Crop Update 30(10)
  8. Shober, A. L., & Miller, J. O. (2022). Calculate manganese availability index to identify potential deficiencies in soybean. Weekly Crop Update 30(8)
  9. Miller, J. O., & Shober, A. L. (2022). Sulfur and boron additions to corn fertility programs. Weekly Crop Update 30(5)
  10. Miller, J. O., Shober, A. L., & VanGessel, M. (2022). Cover crop biomass and termination considerations. Weekly Crop Update 30(2)
  11. Shober, A. L., & Miller, J. O. (2021). Fall fertilization of cover crops did not increase biomass production when residual soil nitrate was high. Weekly Crop Update 29(27)
  12. Shober, A. L., Miller, J. O., & Challandes, J. (2021). Plant cover crops early to increase chances of successful establishment. Weekly Crop Update 29(26)
  13. Miller, J. O., Taraila, J., & Shober, A. L. (2021). Corn yields following cover crops. Weekly Crop Update 29(26)
  14. Miller, J. O., Taraila, J., & Shober, A. L. (2021). Estimation of cover crop nitrogen with drones. Weekly Crop Update 29(25)
  15. Taraila, J., Miller, J. O., & Shober, A. L. (2021). Cover crops, drone imagery, and winter weather. Weekly Crop Update 29(24)
  16. Shober, A. L., & Miller, J. O. (2021). University of Delaware scientists participate in a national effort to improve fertilizer recommendations. Weekly Crop Update 29(24)
  17. Shober, A. L., & Miller, J. O. (2021). Mid-season tissue testing can help with future management decisions. Weekly Crop Update 29(15)
  18. Miller, J. O., Taraila, J., & Shober, A. L. (2021). Cover crop termination for 2021. Weekly Crop Update 29(2)
  19. Riggi, S., & Shober, A. L. (2021). Still need nutrient management credits? Weekly Crop Update 29(1)
  20. Shober, A. L., & Miller, J. O. (2021). Early spring nitrogen application strategies. Weekly Crop Update 29(1)
  21. Shober, A. L., Miller, J. O., & M. Reiter. (2020). Using foliar manganese applications to correct deficiencies in double-cropped soybean.Weekly Crop Update 28(20) 
  22. Shober, A. L., & Miller, J. O. (2020). Nutrient management considerations as we near sidedress time for corn. Weekly Crop Update 28(11)
  23. Miller, J. O., & Shober, A. L. (2020). Do you need micronutrients in your starter? Weekly Crop Update 28(6)
  24. Miller, J. O., & Shober, A. L. (2020). Split applied K on soybeans. Weekly Crop Update 28(4)
  25. Miller, J. O., Taraila, J., & Shober, A. L. (2020). Early cover crop termination vs planting green. Weekly Crop Update 28(4) 
  26. Miller, J. O., & Shober, A. L. (2020). Keep up with K. Weekly Crop Update 28(4) 
  27. Shober, A. L., & Miller, J. O. (2020). Act now! Do not delay spring n applications to small grains. Weekly Crop Update 28(2)
  28. Mosesso, L.R., Shober, A. L., & Miller, J. O. (2020). UD laboratory studies suggest that humic/ fulvic acid additives are not effective at increasing P bioavailability. Weekly Crop Update 28(1)
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