@article{sweeney_diaz_pedreira_havlin_2022, title={Long-term yield response of corn, wheat, and double-crop soybean to tillage and N placement}, ISSN={["1435-0645"]}, DOI={10.1002/agj2.20997}, journal={AGRONOMY JOURNAL}, author={Sweeney, Daniel W. and Diaz, Dorivar A. Ruiz and Pedreira, Bruno C. and Havlin, John L.}, year={2022}, month={Feb} }
 @article{havlin_austin_hardy_howard_heitman_2022, title={Nutrient Management Effects on Wine Grape Tissue Nutrient Content}, volume={11}, ISSN={["2223-7747"]}, url={https://doi.org/10.3390/plants11020158}, DOI={10.3390/plants11020158}, number={2}, journal={PLANTS-BASEL}, author={Havlin, John L. and Austin, Robert and Hardy, David and Howard, Adam and Heitman, Josh L.}, year={2022}, month={Jan} }
 @article{schlegel_havlin_2021, title={Irrigated grain sorghum response to 55 years of nitrogen, phosphorus, and potassium fertilization}, volume={113}, ISSN={["1435-0645"]}, DOI={10.1002/agj2.20453}, number={1}, journal={AGRONOMY JOURNAL}, author={Schlegel, Alan J. and Havlin, John L.}, year={2021}, month={Jan}, pages={464–477} }
 @misc{havlin_schlegel_2021, title={Review of Phosphite as a Plant Nutrient and Fungicide}, volume={5}, ISSN={["2571-8789"]}, DOI={10.3390/soilsystems5030052}, number={3}, journal={SOIL SYSTEMS}, author={Havlin, John L. and Schlegel, Alan J.}, year={2021}, month={Sep} }
 @article{havlin_heiniger_2020, title={Soil Fertility Management for Better Crop Production}, volume={10}, ISSN={["2073-4395"]}, DOI={10.3390/agronomy10091349}, number={9}, journal={AGRONOMY-BASEL}, author={Havlin, John and Heiniger, Ron}, year={2020}, month={Sep} }
 @article{dold_heitman_giese_howard_havlin_sauer_2019, title={Upscaling Evapotranspiration with Parsimonious Models in a North Carolina Vineyard}, volume={9}, ISSN={2073-4395}, url={http://dx.doi.org/10.3390/agronomy9030152}, DOI={10.3390/agronomy9030152}, abstractNote={Water stress can positively or negatively impact grape yield and yield quality, and there is a need for wine growers to accurately regulate water use. In a four-year study (2010–2013), energy balance fluxes were measured with an eddy-covariance (EC) system in a North Carolina vineyard (Vitis vinifera cv. Chardonnay), and evapotranspiration (ET) and the Crop Water Stress Index (CWSI) calculated. A multiple linear regression model was developed to upscale ET using air temperature (Ta), vapor pressure deficit (VPD), and Landsat-derived Land Surface Temperature (LST) and Enhanced Vegetation Index (EVI). Daily ET reached values of up to 7.7 mm day−1, and the annual ET was 752 ± 59 mm, as measured with the EC system. The grapevine CWSI was between 0.53–0.85, which indicated moderate water stress levels. Median vineyard EVI was between 0.22 and 0.72, and the EVI range (max–min) within the vineyard was 0.18. The empirical models explained 75%–84% of the variation in ET, and all parameters had a positive linear relationship to ET. The Root Mean Square Error (RMSE) was 0.52–0.62 mm. This study presents easily applicable approaches to analyzing water dynamics and ET. This may help wine growers to cost-effectively quantify water use in vineyards.}, number={3}, journal={Agronomy}, publisher={MDPI AG}, author={Dold, Christian and Heitman, Joshua and Giese, Gill and Howard, Adam and Havlin, John and Sauer, Tom}, year={2019}, month={Mar}, pages={152} }
 @article{schlegel_havlin_2017, title={Corn Yield and Grain Nutrient Uptake from 50 Years of Nitrogen and Phosphorus Fertilization}, volume={109}, ISSN={["1435-0645"]}, DOI={10.2134/agronj2016.05.0294}, number={1}, journal={AGRONOMY JOURNAL}, author={Schlegel, Alan J. and Havlin, John L.}, year={2017}, pages={335–342} }
 @article{haines_gehl_havlin_ranney_2015, title={Nitrogen and Phosphorus Fertilizer Effects on Establishment of Giant Miscanthus}, volume={8}, ISSN={["1939-1242"]}, DOI={10.1007/s12155-014-9499-4}, number={1}, journal={BIOENERGY RESEARCH}, author={Haines, S. A. and Gehl, R. J. and Havlin, J. L. and Ranney, T. G.}, year={2015}, month={Mar}, pages={17–27} }
 @article{holland_heitman_howard_sauer_giese_ben-gal_agam_kool_havlin_2013, title={Micro-Bowen ratio system for measuring evapotranspiration in a vineyard interrow}, volume={177}, ISSN={["1873-2240"]}, DOI={10.1016/j.agrformet.2013.04.009}, journal={AGRICULTURAL AND FOREST METEOROLOGY}, author={Holland, S. and Heitman, J. L. and Howard, A. and Sauer, T. J. and Giese, W. and Ben-Gal, A. and Agam, N. and Kool, D. and Havlin, J.}, year={2013}, month={Aug}, pages={93–100} }
 @book{havlin_2013, title={Soil fertility and fertilizers: An introduction to nutrient management}, publisher={Upper Saddle River, N.J.: Pearson}, author={Havlin, J.}, year={2013} }
 @article{havlin_hardy_gehl_spayd_2012, title={Survey of Nutrient Status in Vitis vinifera Grapes in North Carolina}, volume={43}, ISSN={["0010-3624"]}, DOI={10.1080/00103624.2011.638600}, number={1-2}, journal={COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS}, author={Havlin, J. L. and Hardy, D. H. and Gehl, R. J. and Spayd, S. E.}, year={2012}, pages={299–314} }
 @article{megonigal_stauffer_starrs_pekarik_drohan_havlin_2010, title={"Dig It!": How an Exhibit Breathed Life into Soils Education}, volume={74}, ISSN={["1435-0661"]}, DOI={10.2136/sssaj2009.0409}, number={3}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Megonigal, J. Patrick and Stauffer, Barbara and Starrs, Siobhan and Pekarik, Andrew and Drohan, Patrick and Havlin, John}, year={2010}, pages={706–716} }
 @article{drohan_havlin_megonigal_cheng_2010, title={The "Dig It!" Smithsonian Soils Exhibition: Lessons Learned and Goals for the Future}, volume={74}, ISSN={["1435-0661"]}, DOI={10.2136/sssaj2009.0017}, number={3}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Drohan, Patrick J. and Havlin, John L. and Megonigal, J. Patrick and Cheng, H. H.}, year={2010}, pages={697–705} }
 @article{havlin_balster_chapman_ferris_thompson_smith_2010, title={Trends in Soil Science Education and Employment}, volume={74}, ISSN={["0361-5995"]}, DOI={10.2136/sssaj2010.0143}, number={5}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Havlin, J. and Balster, N. and Chapman, S. and Ferris, D. and Thompson, T. and Smith, T.}, year={2010}, pages={1429–1432} }
 @inproceedings{havlin_heiniger_2009, title={A variable-rate decision support tool}, volume={10}, DOI={10.1007/s11119-009-9121-5}, number={4}, booktitle={Precision Agriculture}, author={Havlin, J. L. and Heiniger, Ronnie}, year={2009}, pages={356–369} }
 @article{crozier_havlin_hoyt_rideout_mcdaniel_2009, title={Three Experimental Systems to Evaluate Phosphorus Supply from Enhanced Granulated Manure Ash}, volume={101}, ISSN={["0002-1962"]}, DOI={10.2134/agronj2008.0187x}, number={4}, journal={AGRONOMY JOURNAL}, author={Crozier, C. R. and Havlin, J. L. and Hoyt, G. D. and Rideout, J. W. and McDaniel, R.}, year={2009}, pages={880–888} }
 @article{harrelson_hoyt_havlin_monks_2008, title={Effect of planting date and nitrogen fertilization rates on no-till pumpkins}, volume={43}, number={3}, journal={HortScience}, author={Harrelson, E. R. and Hoyt, G. D. and Havlin, J. L. and Monks, D. W.}, year={2008}, pages={857–861} }
 @article{robertson_allen_boody_boose_creamer_drinkwater_gosz_lynch_havlin_jackson_et al._2008, title={Long-term agricultural research: A research, education, and extension imperative}, volume={58}, ISSN={["0006-3568"]}, DOI={10.1641/B580711}, number={7}, journal={BIOSCIENCE}, author={Robertson, G. Philip and Allen, Vivien G. and Boody, George and Boose, Emery R. and Creamer, Nancy G. and Drinkwater, Laurie E. and Gosz, James R. and Lynch, Lori and Havlin, John L. and Jackson, Louise E. and et al.}, year={2008}, pages={640–645} }
 @article{harrelson_hoyt_havlin_monks_2007, title={Effect of winter cover crop residue on no-till pumpkin yield}, volume={42}, number={7}, journal={HortScience}, author={Harrelson, E. R. and Hoyt, G. A. and Havlin, J. L. and Monks, D. W.}, year={2007}, pages={1568–1574} }
 @article{bond_maguire_havlin_2006, title={Change in soluble phosphorus in soils following fertilization is dependent on initial Mehlich-3 phosphorus}, volume={35}, ISSN={["1537-2537"]}, DOI={10.2134/jeq2005.0404}, number={5}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={Bond, C. Ryan and Maguire, R. O. and Havlin, J. L.}, year={2006}, pages={1818–1824} }
 @article{schlegel_grant_havlin_2005, title={Challenging approaches to nitrogen fertilizer recommendations in continuous cropping systems in the Great Plains}, volume={97}, ISSN={["1435-0645"]}, DOI={10.2134/agronj2005.0391}, number={2}, journal={AGRONOMY JOURNAL}, author={Schlegel, AJ and Grant, CA and Havlin, JL}, year={2005}, pages={391–398} }
 @book{havlin_2005, title={Soil fertility and fertilizers: An introduction to nutrient management (7th ed.)}, ISBN={0130278246}, publisher={Upper Saddle River, NJ: Pearson/Prentice Hall}, author={Havlin, J. L.}, year={2005} }
 @article{schlegel_dhuyvetter_havlin_2003, title={Placement of UAN for dryland winter wheat in the central high plains}, volume={95}, ISSN={["0002-1962"]}, DOI={10.2134/agronj2003.1532}, number={6}, journal={AGRONOMY JOURNAL}, author={Schlegel, AJ and Dhuyvetter, KC and Havlin, JL}, year={2003}, pages={1532–1541} }
 @article{schmidt_dejoia_ferguson_taylor_young_havlin_2002, title={Corn yield response to nitrogen at multiple in-field locations}, volume={94}, DOI={10.2134/agronj2002.0798}, number={4}, journal={Agronomy Journal}, author={Schmidt, J. P. and Dejoia, A. J. and Ferguson, R. B. and Taylor, R. K. and Young, R. K. and Havlin, J. L.}, year={2002}, pages={798–806} }
 @article{heiniger_havlin_crouse_kvien_t._2002, title={Seeing is believing: The role of field days and tours in precision agriculture education}, volume={3}, ISBN={1385-2256}, number={4}, journal={Precision Agriculture}, author={Heiniger, R. W. and Havlin, J. L. and Crouse, D. A. and Kvien, C. and T., Knowles.}, year={2002}, pages={309} }
 @article{taylor_kluitenberg_schrock_zhang_schmidt_havlin_2001, title={Using yield monitor data to determine spatial crop production potential}, volume={44}, DOI={10.13031/2013.7007}, number={6}, journal={Transactions of the ASAE}, author={Taylor, R. K. and Kluitenberg, G. J. and Schrock, A. D. and Zhang, N. and Schmidt, J. P. and Havlin, J. L.}, year={2001}, pages={1409–1414} }
 @article{crouse_havlin_mcbride_white_heiniger_weisz_roberson_2000, title={Precision farming education at NC State University}, journal={Proceedings of the 5th International conference on precision agriculture, Bloomington, Minnesota, USA, 16-19 July, 2000}, publisher={Madison, WI : Precision Agriculture Center, University of Minnesota, ASA-CSSA-SSSA}, author={Crouse, D. A. and Havlin, J. L. and McBride, R. G. and White, J. G. and Heiniger, R. and Weisz, R. and Roberson, G.}, year={2000}, pages={1} }
 @article{austin_crouse_havlin_hodges_2000, title={The Spatial Information Research Laboratory at North Carolina State University}, journal={Proceedings of the 5th International conference on precision agriculture, Bloomington, Minnesota, USA, 16-19 July, 2000}, publisher={Madison, WI : Precision Agriculture Center, University of Minnesota, ASA-CSSA-SSSA}, author={Austin, R. E. and Crouse, D. A. and Havlin, J. L. and Hodges, S. C.}, year={2000}, pages={1} }
 @book{havlin_beaton_tisdale_nelson_1999, title={Soil fertility and fertilizers: An introduction to nutrient management}, ISBN={0136268064}, publisher={Medford, NJ: Prentice Hall}, author={Havlin, J. L. and Beaton, J. D. and Tisdale, S.L. and Nelson, W. L.}, year={1999} }
 @article{havlin_schlegel_1997, title={Dryland conservation technologies: Enhancing agricultural profitability and sustainability}, volume={36}, number={3}, journal={Annals of Arid Zone}, author={Havlin, J. L. and Schlegel, A. J.}, year={1997}, pages={291–303} }
 @article{schlegel_havlin_1997, title={Green fallow for the central Great Plains}, volume={89}, ISSN={["0002-1962"]}, DOI={10.2134/agronj1997.00021962008900050009x}, number={5}, journal={AGRONOMY JOURNAL}, author={Schlegel, AJ and Havlin, JL}, year={1997}, pages={762–767} }
 @article{halvorson_havlin_schlegel_1997, title={Nutrient management for sustainable dryland farming systems}, volume={36}, number={3}, journal={Annals of Arid Zone}, author={Halvorson, A. D. and Havlin, J. L. and Schlegel, A. J.}, year={1997}, pages={233–254} }