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Showing posts from May, 2013

Small Grains Disease Update

Early Season Scouting in Small Grains: Tan Spot
With the overcast and humid days which many parts of the state have been experiencing in the last week, be sure to scout smalls grains for signs of early tan spot infection. Tan spot will be particularly prevalent on previous wheat ground. Spring wheat in trials on the Northwest Research and Outreach Center at Crookston has 100% incidence with tan spot. There is some tan spot in the winter wheat. Early signs of tan spot in fields south of Moorhead, Minnesota, have also been identified.

Soil Residual Herbicide Options after Soybean Emergence

By Lizabeth Stahl, Extension Educator - Crops, and Jeff Gunsolus, Extension Agronomist - Weed Science
With very tight windows of opportunity to plant this year, preemergence herbicides may not have been applied as planned.  Application of a residual herbicide prior to planting or emergence of the crop, in both corn and soybean, is a great weed management strategy overall and also a key tool in managing against herbicide resistance.  What are some of our options if soybeans emerged before a preemergence herbicide application was made?  

Hybrid Maturity Considerations for Delayed Corn Planting

By Jeff Coulter, Extension Corn Agronomist
For much of Minnesota, the windows of opportunity for corn planting have been late to arrive and interrupted by weather. This article addresses several concerns about late-planted corn.

Expected yield remains high for corn planted by May 25
University of Minnesota Extension planting date studies show that highest corn yields typically occur when corn is planted by early to mid-May. However, high corn yields can still occur if planting is completed prior to Memorial Day.

University of Minnesota Extension Launches Websites for Alfalfa Weather Damage and Survey to Determine Extent of Alfalfa Damage

By David Nicolai and Doug Holen, Extension Educators - Crops
The University of Minnesota Extension Forage Team has developed a list of resources available to livestock and alfalfa producers affected by the recent alfalfa winter injury and winterkill in 2013. These resources are available at the U of MN Extension forage website:

Starter and Sulfur Fertilizer use for Corn:Spring 2013

By Daniel Kaiser, Extension Soil Fertility Specialist
With the variation in conditions we have seen this spring there are a few issues that may show up in fields related to cool and wet soils. Purpling of corn leaves due to phosphorus (P) deficiency and early season interveinal striping due to sulfur (S) may occur if temperatures remain cool and we continue to have frequent rains. I want to take some time and outline these issues and some of the related research that has been conducted in the past five years.

Iron Deficiency Chlorosis Research in NW Minnesota

By John Wiersma, Agronomist
Northwest Research and Outreach Center
High pH, highly calcareous soils, common in western Minnesota, restrict the availability of soil Fe needed for optimum soybean growth and yield. On such soils, the amount of Fe fertilizer applied must surpass a threshold before there is sufficient available Fe in the soil solution to induce a positive growth response. Only a limited number of management tactics designed to improve the availability of Fe have been studied with soybean. These include variety selection, seeding density, seed-applied or in-furrow materials, and foliar treatments.

Maximizing forage in winter injured and killed stands, Spring 2013

By Dr. Craig Sheaffer, David Nicolai and Doug Holen
An unusual amount of winter injury and winterkill of alfalfa stands occurred in south central and southern Minnesota. While reports do not represent a detailed analysis of where injury to alfalfa has occurred across Minnesota, they do suggest a need for producers to check on stands and evaluate them for potential winter injury.

Using Grid Soil Sampling to Guide Manure Application

Les Everett, Randy Pepin and Jose A. Hernandez, University of Minnesota

Using grid soil sampling to guide manure application can be a profitable investment, is the conclusion from case studies based on eight Minnesota farms. In fields where there is a history of non-uniform manure application, targeting new manure applications to areas with lower phosphorus and potassium soil test values can result in considerable economic returns above the cost of grid soil sampling. Variable rate manure applicators are not required when fields can be divided into application and no-application zones, with supplemental nitrogen fertilizer in the no-manure zones. The brief case studies are available on the University of Minnesota Extension web page for Manure Management and Air Quality, under Grid Soil Sampling for Manure Application. An introduction, the eight case studies, and a set of short video presentations based on the case studies are available at…