Title: Phosphorus
Date: Tue Jul 17, 2018
Time: 1:00 PM - 3:00 PM
Moderator: Heidi Peterson
Precision Technology to Improve Nutrient Use and Reduce Losses to the Environment

Phosphorus (P) and potassium (K) become concentrated where they are applied partially because of the lack of soil mixing in conservation tillage systems. This presentation will examine the effect of surface broadcast and sub-surface band placement of P and K and of no-till and strip-till tillage on soil characteristics; soil water, P, and K distribution; root distribution and yield of corn and soybean; and to determine how to correctly estimate fertility levels by soil sampling after sub-surface band fertilization. Further, the effect of tillage and P placement on reducing P losses to the environment will be discussed. 

Fabián Fernández (speaker)
Nutrient Management Specialist
University of Minnesota
St. Paul, MN 55108
Dr. Fabián G. Fernández is an Associate Professor in the Department of Soil, Water, and Climate at the University of Minnesota, Twin Cities. He earned his Ph.D. degree from Purdue University and M.S. and B.S. degrees from Brigham Young University. Before joining the University of Minnesota, he was an Assistant Professor at the University of Illinois. The research and extension education programs of Dr. Fernández are focused primarily on crop production and environmental issues related to nutrient management in corn cropping systems. He seeks to identify and implement nitrogen management practices that are sustainable both in terms of minimizing environmental impacts, specifically water quality, and improving crop yields.
Length (approx): 40 min
Variable Rate Application to Increase Phosphorus Use Efficiency and Minimize Water Quality Impairment

The presentation will review how variable rate application combined with appropriate soil sampling can increase phosphorus use efficiency, profits from fertilizer or manure application, and at the same time reduce the risk of phosphorus loss to water resources.

Antonio Mallarino (speaker)
Iowa State University
Ames, IA 50011
Dr. Antonio Mallarino is Professor of Agronomy and Nutrient Management Extension Specialist at Iowa State University. His research and extension programs emphasize phosphorus, potassium, lime, and micronutrients management. His work focuses on soil and plant tissue sampling and testing, placement methods, use of precision agriculture technologies, and fertilizer or manure phosphorus management impacts on water quality. He is Fellow of the American Society of Agronomy and the Soil Science Society of America. He was member of teams that developed the Iowa Phosphorus Index and the Iowa Nutrient Export Reduction Strategy.
Length (approx): 40 min
The Value of Proper Soil Testing and Use in Precision Ag

The long-term interaction between precision fertilizer placement, tillage systems, and plant nutrient cycling affect the distribution of nutrients in the soil. This presentation will discuss the implications for soil sampling and the development of accurate field data for variable-rate nutrient applications. Also, soil test interpretations as well as crop productivity and profitability under long-term precision crop management.

Dorivar Ruiz Diaz (speaker)
Professor and Soil Fertility Specialist
Kansas State Univeristy
Manhattan, KS 66506
Dr. Dorivar Ruiz Diaz is a professor and soil fertility specialist at Kansas State University. He holds a PhD in soil fertility from Iowa State University and MS in soil fertility from the University of Illinois at Urbana-Champaign. His research and extension work focus on the efficient use of fertilizers, micronutrient management, and fertilizer placement with different tillage systems to increase agronomic efficiency and reduce environmental impact.
Length (approx): 40 min