Michigan State University Extension
Soils & Soil Management - Fertilizer - 06039709
07/10/97

Nitrogen

Tri-state Fertilizer Recommendations for Corn, Soybeans,    
Wheat and Alfalfa                                           
Extension Bulletin E-2567 (New), July 1995                  

M.L. Vitosh, Michigan State University; J.W. Johnson, The   
Ohio State University; D.B. Mengel, Purdue University;      
Co-editors                                                  

Profitability, concern for groundwater quality and          
conservation of energy are good reasons to improve          
nitrogen use efficiency. Placement of fertilizer nitrogen   
and timing of application affect nitrogen use efficiency.   
Placement and timing of nitrogen application are            
management decisions within a producer's production         
system. Soil characteristics, rainfall and temperature,     
tillage system and fertilizer source affect the efficacy    
of application. Because of our inability to predict the     
occurrence and amounts of rainfall for a specific year,     
nitrogen placement and timing should be based on            
conditions that most frequently occur. Most of the          
fertilizer nitrogen applied in the eastern Corn Belt is     
used on corn, so most of the discussion here is on          
nitrogen management practices for corn.                     

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