Potassium Fertility Research and Education

Brad C. Joern

Brad C. Joern
Professor, Soil Chemistry and Plant Nutrition

Education

Professional Experience

Assistant Professor 1991-1996 Dept. of Agronomy, Purdue University, West Lafayette, IN

Associate Professor 1996-2001 Dept. of Agronomy, Purdue University, West Lafayette, IN

Professor 2001-present Dept. of Agronomy, Purdue University, West Lafayette, IN

Membership in Academic, Professional, and Scholarly Societies

American Society of Agronomy
Council on Agricultural Science and Technology
Gamma Sigma Delta
Sigma Xi
Soil Science Society of America

Refereed Journal Articles on Potassium

Cox, A.E., B.C. Joern, and C.B. Roth. 1996. Nonexchangeable ammonium and potassium in soils using a modified sodium tetraphenylboron method. Soil Sci. Soc. Am. J. 60:114-120.

Li, R., J.J. Volenec, B.C. Joern, and S.M. Cunningham. 1996. Seasonal changes in nonstructural carbohydrates, protein, and macronutrients in roots of alfalfa, red clover, sweetclover, and birdsfoot trefoil. Crop Sci. 35:617-623.

Cox, A.E., and B.C. Joern. 1997. Release kinetics of nonexchangeable potassium in soils using sodium tetraphenylboron. Soil Sci. 167:588-598.

Li, R., J.J. Volenec, B.C. Joern, and S.M. Cunningham. 1997. Effects of potassium and nitrogen nutrition on carbohydrate and protein metabolism in alfalfa roots. J. Plant Nutrition 20:511-529.

Cox, A.E., B.C. Joern, S.M. Brouder, and D. Gao. 1999. Plant-available potassium assessment with a modified sodium tetraphenylboron method. Soil Sci. Soc. Am. J. 63: 902-911.

Invited Papers on Potassium

Volenec, J.J., B.C. Joern, L. Rong, and S.M. Cunningham. 1999. Effects of potassium nutrition on carbohydrate and protein metabolism in alfalfa roots. pp. 77-83. In D. Oosterhuis and G. Berkowitz (ed.) Frontiers in Potassium Nutrition: New Perspectives on the Effects of Potassium on Crop Plant Physiology. Potash and Phosphate Institute/Potash and Phosphate Institute of Canada. Norcross Georgia, USA and Saskatoon Saskatchewan, CA.

Invited Presentations on Potassium

Cox, A.E., B.C. Joern, and C.B. Roth. 1994. Soil ammonium and potassium supply characteristics as determined by quantity/intensity isotherms. Am. Soc. Agron. Ann. Meetings, Nov. 12-18, 1994. Seattle, WA.

Volenec, J.J., B.C. Joern, and S.M. Cunningham. 1996. Effects of potassium nutrition on carbohydrate and protein metabolism in alfalfa roots. American Soc. Agron. Ann. Meetings, Nov. 3-8, 1996. Indianapolis, IN.

Joern, B.C., J.A. Brokish, and A.E. Cox. 1997. Soil Phosphorus and Potassium Research at Purdue University. Purdue University - Iwate University plant mineral nutrition research information exchange conference, Sept. 26-Oct. 3, 1997. Morioka, Japan.

Berg, W.K., S.M. Cunningham, B.C. Joern, K.D. Johnson, S.M. Brouder, And J.J. Volenec. 1999. Potassium and phosphorus effects on alfalfa yield, yield components, and root physiology. August 25-31, 1999. Iwate University, Morioka Japan.

Joern, B.C., K.H. Hamrick, and A.E. Cox. 2000. Sodium tetraphenylboron: an improved potassium soil test? Four-state Soil Testing Laboratory Conference. Feb. 24-25, 2000. Dubuque, IA.

Brouder, S.M., and B.C. Joern. 2001. Innovations in soil potassium (K) testing for agriculture. Am. Soc. Agron. Ann. Meetings, Oct. 21-25, 1994. Charlotte, NC.

Extension/Technical Publications on Potassium

Li, R., B.C. Joern, and J.J. Volenec. 1995. Interaction of nitrogen and potassium nutrition on growth and root physiology of alfalfa. p. 10. In: Proc. Central Alfalfa Improvement Conf., June 18-20, 1995. Spearfish, SD.

Berg, W.K., S.M. Cunningham, B.C. Joern, K.D. Johnson, S.M. Brouder, and J.J. Volenec. 1999. Potassium and phosphorus nutrition of alfalfa: a preliminary look at impact on yield components and root physiology. Better Crops No. 83:10-11.

Berg, W.K., J.J. Volenec, B.C. Joern, S.M. Cunningham, K.D. Johnson, and S.M. Brouder. 2000. Impact of potassium and phosphate nutrition on alfalfa yield components, forage quality and root physiology. p. 70 to 78, In: Proc. Iwate Univ. Workshop on Nutrient Use in Plant Ecosystems.

Berg W.K., S.M. Brouder, B.C. Joern, and J.J. Volenec. 2002. Enhancing alfalfa production through improved phosphorus and potassium management. North Central Extension-Industry Soil Fertility Conference Proceedings. pg 46-52.

Berg W.K., S.M. Brouder, B.C. Joern, and J.J. Volenec. 2002. Enhancing alfalfa production through improved phosphorus and potassium management. Eastern Canada Agronomy Workshop Proceedings.

Berg W.K., S.M. Brouder, K.D. Johnson, B.C. Joern, and J.J. Volenec. 2002. Phosphorus and potassium effects on alfalfa growth, nutrient accumulation, and persistence. 2002 Forage and Grassland Council National Meeting Proceedings. pp. 76-79.

Berg W.K., S.M. Brouder, B.C. Joern, K.D. Johnson, and J.J. Volenec. 2003. Enhancing alfalfa production through improved potassium management. Better Crops. 87:8-11.

Berg W.K., S.M. Brouder, B.C. Joern, K.D. Johnson, and J.J. Volenec. 2003. Improved phosphorus management enhances alfalfa production. Better Crops. 87:20-23.

Berg, W. K. , B. C. Joern, K. D. Johnson, S. M. Brouder and J.J. Volenec. 2003. Physiological Links of Growth Stage and Nutrient Needs - Alfalfa. Fluid Fertilizer Foundation. Scottsdale AZ. 20:27-35.