J U L Y / A U G U S T 2 0 1 9 POTATO GROWER 19 Sargent County, North Dakota, to eval- uate 60 potato cultivars and germplasm for resistance to the root- lesion nematode Pratylenchus scrib- neri. From the first year of the field experiment, nearly every cultivar of potato allowed the root-lesion nema- tode to reproduce with reproductive factors (RF) ranging from 1.2 to 25.2, but eleven of the cultivars were identi- fied to have low reproduction (RF = 1.2-2.8). A second year of the experi- ment will be performed to confirm their reactions to P. scribneri. University of Minnesota, Nutrient Management Re- search on Irrigated Potatoes Dr. Carl Rosen, UMN In 2019, six studies conducted at the Sand Plain Research Farm in Becker and one at a potato seed farm near Staples are outlined. The overall goal of this research is to improve nutrient management for potato production on irrigated sandy soils. The objectives and brief descriptions of these studies are as follows: Evaluation of Management Practices to Improve Soil Health for Potato Production In September 2018, a large multistate research project entitled “Enhancing Soil Health in U.S. Potato Production Systems” was funded by the USDA- NIFA Specialty Crop Research Initiative. More information about this project can be found at the follow- ing website: http://potatosoilhealth. cfans.umn.edu/. For one of the objec- tives, each participating state has set up replicated plots evaluating how var- ious management practices affect soil health indicators and potato yield and quality. Our study at the Sand Plain Research Farm is intended to evaluate the effects of potato cultivar (Russet Burbank, Bannock, and Norkotah Russet), fumigation (Vapam vs, no Vapam), and cover crops coupled with turkey manure in two and three year rotations. Metam sodium fumigation was applied to the appropriate treat- ments in the three-year rotation in early November 2018. Turkey manure was applied in selected treatments in the three-year rotation plots in April 2019. Initial soil samples have been collected and will be analyzed for soil physical and chemical characteristics (e.g., nutrient concentrations, organic