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Corn Production as Affected by Nitrogen Application Timing and Tillage

Southern Research and Outreach Center, Univ. of Minnesota, 35838 120th St., Waseca, MN 56093-4521

View larger version (31K): [in a new window]   Fig. 1. Interaction between year and time/placement of N for grain yield, silage yield, total N uptake, and apparent N recovery.

View larger version (18K): [in a new window]   Fig. 2. Ammonium- and nitrate-N concentrations in the 0- to 30-cm soil layer in May and June as affected by time of N application in 1997, 1998, and 1999. Standard error of the mean expressed as error bars.

View larger version (24K): [in a new window]   Fig. 3. Relationship between relative leaf chlorophyll content determined by SPAD meter at four corn growth stages and relative grain yield for 1997, 1998, and 1999.