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Showing posts from October, 2021

Atmospheric nutrient deposition research update: Q&A with Paulo Pagliari

Extension nutrient management specialist Paulo Pagliari is currently in the third year of a study measuring atmospheric nutrient deposition in Minnesota. Last September,  we wrote about preliminary results from the first year of the study (2019). This year, we sat down with Pagliari to get an update on the study’s 2020 results. The project is funded by Minnesota’s fertilizer check-off dollars through the Agricultural Fertilizer Research and Education Council (AFREC) . You made some changes to the study after the first year. What were the differences between the 2019 study year and the last two years of the project? Yes, we did some fine-tuning of what we're looking at. One thing that was a major change was one of the locations. We were originally doing this study at Becker, Morris, Lamberton, Waseca and Crookston, and those are all areas surrounded by agricultural fields. Then we decided to add an area where there's little influence from grain agriculture, so we replaced the

Herbicide-resistant waterhemp and ragweeds survey help requested

Navjot Singh, Graduate student, and Debalin Sarangi, Extension weed scientist Figure 1. Waterhemp plant surviving Enlist One application at 6 pt/A after 28 days after treatment in the greenhouse. Herbicide-resistant weeds are threatening agronomic crop production in Minnesota (Figure 1). In 2020, we received about 30 waterhemp samples - mostly from southern MN - and the greenhouse resistance screening results showed that the majority of waterhemp populations were resistant to ALS-inhibiting herbicides (e.g., Pursuit, Raptor, and Classic) and glyphosate.  The results also showed that 14 and 15% of waterhemp populations were resistant to atrazine and PPO inhibitors (e.g., Flexstar), respectively. If at least 40% of plants survive a 3X labeled dose of a certain herbicide, we consider that population to be resistant. Figure 2. Distribution of multiple herbicide-resistant waterhemp populations in Minnesota. Two populations from Carver and Olmsted County showed resistance to four herbicide s

From cover crops to tillage: How soil health impacts nutrient management

In  this episode  of the Nutrient Management Podcast, three U of M researchers discuss soil management and nutrient issues. How do erosion and tillage practices impact nutrients in the soil and nutrient management?  After a dry spring and summer, what should growers know about soil and nutrient management heading into the fall? Is deep tillage to break compaction a good idea this year? How can farmers better manage soils to avoid nutrient issues? Are cover crops a good idea this year? Listen to the podcast View the podcast transcript Guests: Fabian Fernandez, Extension nitrogen management specialist Anna Cates, Extension soil health specialist Jodi DeJong-Hughes, Extension educator - Willmar Additional resources: Fall 2021 soil testing considerations for the 2022 growing season Growing cover crops in Minnesota: 4 great resources to get you started Cover crop residue and C:N ratios Soil management and health Soil organic matter in cropping systems Minnesota Office of Soil Health Follow