Corn Yield Response to Nitrogen Rate and Timing in Northern Wisconsin.

Corn Yield Response to Nitrogen Rate and Timing in Northern Wisconsin

Joseph Sisko

Nitrogen rate and timing can vastly influence corn yield. Previous research has shown that split rate nitrogen application has raised effects on corn yields compared to a one time nitrogen application. The objective of this study was to determine the impact of pre-plant and side dress urea application combinations on corn yields in Northern Wisconsin. The study was conducted in Barron, WI using two different rates at three different timings design with three replicated plots. Corn plots were 80’ by 250’ with 30 inch row widths at a population of 34,000 plants/acre. Urea was applied at 175 and 200 lb. N per acre using three different rate and timing combinations: a) half applied pre-plant broadcast and the remaining half side dressed at V6, b) half side dressed at V3 and half side dressed at V6 and c) all N side dressed at stage V6. There was also a 0lb N/acre control. This plot design was established in a field utilizing a corn-corn. NDVI data were collected at V3, V6 and VT. Yield components were measured at R5 and actual yield measured at R6 then a yield average will be taken at harvest. Data indicated an interaction between rate and timing on corn yield response.