Start Date: 2014
Principal Investigator: Carl Rosen
Organization: University of Minnesota, Department of Soil, Water, and Climate
The availability of new sweet corn varieties with higher nitrogen (N) efficiency means researchers should revisit N recommendations for non-irrigated sweet corn production. This research also examined the impact of split N applications, as well as “smart fertilizer” products like coated urea, on sweet corn yields. The specific objective is to determine the effects of N rate/rate/timing, hybrid, plant population density, and planting date on sweet corn yield, N uptake, and residual soil N.
Determine the effects of N rate and timing, hybrid, plant population density, and planting date on sweet corn yield, N uptake, N use efficiency, and end-of-season residual soil N.
We evaluated three hybrids (DMC 21-84, GSS 1477, GM Code 646) planted at two times (May and June), thinned to one of the two density categories and receiving 6 N treatments. Both cut and green yield increased with increasing N rate, with the response to N rate was stronger in high-density plots, but did not vary significantly among the hybrids or between the two planting months. However, based on cut yield and green yield, GM Code 646 outperformed the other two hybrids or between the two planting months.