| Review of greenhouse gas emissions from crop production systems and fertilizer management effects CS Snyder, TW Bruulsema, TL Jensen, PE Fixen Agriculture, Ecosystems & Environment 133 (3-4), 247-266, 2009 | 1880 | 2009 |
| Testing soils for phosphorus PE Fixen, JH Grove Soil testing and plant analysis 3, 141-180, 1990 | 466 | 1990 |
| Nutrient/fertilizer use efficiency: measurement, current situation and trends P Fixen, F Brentrup, T Bruulsema, F Garcia, R Norton, S Zingore Managing water and fertilizer for sustainable agricultural intensification …, 2015 | 399 | 2015 |
| Phosphorus: its efficient use in agriculture AE Johnston, PR Poulton, PE Fixen, D Curtin Advances in agronomy 123, 177-228, 2014 | 319 | 2014 |
| Nitrogen fertilizers: meeting contemporary challenges PE Fixen, FB West Ambio: a journal of the human environment 31 (2), 169-176, 2002 | 245 | 2002 |
| Soil test recommendations--for field, vegetable and fruit crops KA Kelling, PE Fixen, EE Schulte, EA Liegel, CR Simson Publication-Cooperative Extension Programs, University of Wisconsin Extension, 1981 | 193 | 1981 |
| World fertilizer nutrient reserves: a view to the future PE Fixen, AM Johnston Journal of the Science of Food and Agriculture 92 (5), 1001-1005, 2012 | 170 | 2012 |
| Crop responses to chloride PE Fixen Adv. Agron 50, 107-150, 1993 | 151 | 1993 |
| Cropping systems effects on mycorrhizal colonization, early growth, and phosphorus uptake of corn M Vivekanandan, PE Fixen Soil Science Society of America Journal 55 (1), 136-140, 1991 | 122 | 1991 |
| Testing soils for sulfur, boron, molybdenum, and chlorine GV Johnson, PE Fixen Soil testing and plant analysis 3, 265-273, 1990 | 106 | 1990 |
| Global prospects rooted in soil science HH Janzen, PE Fixen, AJ Franzluebbers, J Hattey, RC Izaurralde, ... Soil Science Society of America Journal 75 (1), 1-8, 2011 | 99 | 2011 |
| US agricultural nitrous oxide emissions: context, status, and trends MA Cavigelli, SJD Grosso, MA Liebig, CS Snyder, PE Fixen, RT Venterea, ... Frontiers in Ecology and the Environment 10 (10), 537-546, 2012 | 93 | 2012 |
| Phosphorus and potassium fertilization of irrigated alfalfa on calcareous soils: II. Soil phosphorus solubility relationships PE Fixen, AE Ludwick, SR Olsen Soil Science Society of America Journal 47 (1), 112-117, 1983 | 89 | 1983 |
| Response of Spring Wheat, Barley, and Oats to Chloride in Potassium Chloride Fertilizers1 PE Fixen, RH Gelderman, J Gerwing, FA Cholick Agronomy Journal 78 (4), 664-668, 1986 | 80 | 1986 |
| Sufficiency level and diagnosis and recommendation integrated system approaches for evaluating the nitrogen status of corn ST Dara, PE Fixen, RH Gelderman Agronomy Journal 84 (6), 1006-1010, 1992 | 78 | 1992 |
| The fertility of North American soils, 2010 PE Fixen, TW Bruulsema, TL Jensen, R Mikkelsen, TS Murrell, SB Phillips, ... Better Crops Plant Food 94 (4), 6-8, 2010 | 77 | 2010 |
| World fertilizer nutrient reserves-a view to the future. PE Fixen | 72 | 2009 |
| Influence of Soil and Applied Chloride on Several Wheat Parameters1 PE Fixen, GW Buchenau, RH Gelderman, TE Schumacher, JR Gerwing, ... Agronomy Journal 78 (4), 736-740, 1986 | 67 | 1986 |
| 4R plant nutrition manual: A manual for improving the management of plant nutrition TW Bruulsema, PE Fixen, GD Sulewski International Plant Nutrition Institute (IPNI), Norcross, GA, USA, 2012 | 61 | 2012 |
| Potential biofuels influence on nutrient use and removal in the US PE Fixen Better Crops 91 (2), 12-14, 2007 | 61 | 2007 |
