Response of Irrigated Russet Burbank Potatoes to Nitrogen Rate, Polymer-Coated Urea Sources, and a Microbial Additive
Study author(s): Carl Rosen, University of Minnesota Department of Soil, Water, and Climate
Years of study: 2015
Location(s): Sand Plain Research Farm, Becker, MN
Important: for the complete report, including all tables and figures, please download using the link(s) to the right.
summary
Overall, the application rate of N in this study had a much greater effect on potato plants than the form or timing of its application. Leaflet SPAD, tuber yield, and tuber size all increased with application rate. The only clear effect of N source on leaflet SPAD was higher SPAD values on the first sampling date (June 15) for treatments receiving urea/UAN (treatments 2, 4, and 6) than those receiving Agrocote without UAN at the same total application rates (treatments 12-14). There were also source effects on tuber size, with treatments receiving urea/UAN having larger tubers than those receiving either PCU without UAN, averaged across the three shared application rates (120, 180, and 240 lbs·ac-1 N total).