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Home > Cropping Issues in NW Minnesota > Cropping Issues in Northwest Minnesota: 2012 > Cropping Issues in Northwest Minnesota: June 1, 2012

Cropping Issues in Northwest Minnesota: June 1, 2012

Freeze Injury in Small Grains

by: Dr. Jochum Wiersma
Publish Date: MN Crop News, May 31, 2012

The last two mornings thermometers have dipped below 32° F in many places across Northwest Minnesota. Unlike the freezing temperatures we endured in April, these lows may have actually caused some damage as most fields are now at or past the jointing stage.

Scout Fields now to stay on top of weed management problems

ST. Paul, Minn. (5/22/2012)
Improved rainfall patterns and an early spring have provided corn and soybean producers with opportunities for planting and the application and activation of soil residual herbicides.

Soil residual herbicides that target your most troublesome weeds provide an excellent start in managing herbicide-resistant weeds by targeting them when they are most vulnerable. They also provide the added benefit of reducing crop yield-loss due to weed competition from delayed postemergence herbicide applications.

Multiple Stresses to Weeds and Glyphosate Interactions

by: Rich Zollinger, Extension Weed Specialist (NDSU) and
Jeff Stachler, Extension Weed Specialist (UMN and NDSU)

Cold weather is a stress to weeds. Weed control from GLYPHOSATE applied during or after cold weather may be the same as when applied in warm weather but the end result (weed control) may take longer. Ideal temperatures for applying POST herbicides are between 65° and 85° F. Speed of kill will be slower during cold weather. Use higher rates to overcome reduced control from cold temperatures before or after application. Roundup* applied during cold weather, to large weeds, and weeds with low level resistance may result in less weed control. AMS enhances weed control and can partially overcome reduced control of stressed plants.

The Need for Scouting Fields and a New Weed Management Slogan

by: Jeff Stachler, U of MN and NDSU Extension -
Sugarbeet / Weed Science

Reduced glyphosate activity has been reported by several individuals within the last two weeks. Most likely these plants are surviving due to the three stresses of temperature, soil moisture, and plants surviving tillage mentioned in the article above. In one case a grower made a glyphosate application to large lambsquarters surviving tillage when the high temperature was 88° F. The next day the high temperature was only 68° F. The result was a continuum of responses to glyphosate from dead lambsquarters plants to plants that appeared normal. Additional hard to control species were also present in the field.

Potassium and Dry Soils

By Daniel Kaiser and Jochum Wiersma, University of Minnesota Extension
Publish Date: MN Crop News, May 30, 2012

Weather conditions have been extremely variable around the state of Minnesota this year. While some areas have experienced near record rainfalls others have still been in the midst of a drought. These differences have brought some interesting questions regarding management of potassium and soil testing in the midst of dry soil conditions.

Scouting Alfalfa Fields for Nutrient Deficiencies

By Daniel Kaiser, Extension Nutrient Management Specialist
Publish Date: MN Crop News, May 30, 2012

The dry conditions in March and April have given way to extremely wet areas in some parts of Minnesota. Since alfalfa stands got an early start this year there were a few concerns popping up early in the southeastern part of the state on areas of fields yellowing. While there may have been some effects due to the cool weather in April a couple of nutrient could be of concern.

Inside this Issue

June 1, 2012