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Extension > Minnesota Crop News > June 2016

Thursday, June 30, 2016

Tall off-types in Linkert, Rollag, and other spring wheat varieties.

Acreages of Linkert and Rollag increased this season  as many producers were looking for a stiffer straw variety that was less prone to lodging after the 2015 growing season.  I have had a few calls about the presence of tall off-types in both varieties.  The three basic causes of tall off-types are described here. I'm quite sure that the tall off-types found in Linkert and Rollag are not the result of variety blending but rather have a genetic underpinning. Interestingly enough the genetic mechanism that is described in the link above and which is well understood is not the cause of the tall off-types in Linkert and Rollag as the spring wheat breeding project has done the genetic analysis to confirm the presence of the monosomic deletions in the tall off-types that are found in Linkert and Rollag.  Dr. Jim Anderson has in turn started a small project to better understand what the genetic mechanism is that causes a fair number of the University of Minnesota HRSW releases to have this tendency to produce tall off-types.


Tuesday, June 28, 2016

Drowned-out or hailed-out crops and prevented planting – What to do now?

By Lizabeth Stahl and David Nicolai, Extension Educators - Crops

Drowned-out area of soybean field in Martin County.
Photo Credit:  Liz Stahl
The growing season of 2016 has gotten off to a challenging start for farmers in areas hit with significant rainfall or hail events. In southwestern Minnesota, for example, some fields planted up to three times with corn or two times with soybeans have drowned out again, while other areas have not been able to be planted at all. If you have drowned-out spots in fields, have crops that were hailed out, or you were not able to plant some areas yet, the following are some key considerations at this point in the season:


Updates on water quality monitoring and best management practices for chlorpyrifos and other agricultural insecticides

by Robert Koch, Extension Entomologist (University of Minnesota) and Jamison Scholer (Minnesota Department of Agriculture)

The Minnesota Department of Agriculture (MDA) monitors surface and groundwater throughout the state for water quality impacts resulting from pesticides. Between 2010 and 2015, chlorpyrifos (active ingredient in Lorsban, Cobalt, Dursban, Nufos, Yuma and others) has been detected seasonally in several rivers and streams located in agricultural areas of Minnesota.

Monday, June 27, 2016

Managing sugarbeet diseases

by Mohamed Khan, Extension Sugarbeet Specialist

Several fungal sugarbeet diseases cause significant production issues in Minnesota. Management of three of the most important diseases will be discussed here: Cercospora leaf spot, Rhizoctonia root rot, and Fusarium yellows.

Thursday, June 23, 2016

Assessing June hail damage to corn and soybean

by Jeff Coulter, Seth Naeve, and Jeff Gunsolus, Extension Agronomists


Photo 1. Hail damaged corn in Redwood County, MN, June 21, 2016
Photo: Dave Nicolai
Recent storms left a large area of south central Minnesota affected by severe hail damage. Especially hard hit were Brown and Redwood Counties, where much of the corn was at the V8-V10 stage (8-10 collared leaves) when damaged and soybean had three fully developed trifoliolate leaves (V3).

Wednesday, June 22, 2016

Do foliar fungicides provide a benefit to corn damaged by hail?

by Dean Malvick, Extension Plant Pathologist

Hail damage has recently occurred to corn in Minnesota that was primarily at the V7-9 growth stage. Some producers are asking about the value of applying foliar fungicides to corn damaged by hail. This article will cover key points on this topic and summarize results from field studies.

Wednesday, June 15, 2016

My HRSW is heading... Really, already?


A sentiment I heard a few times this past week is that the wheat crop is heading really early and some question why.  Growth and development of HRSW in this region is - in absence of stressors like excess water or low fertility – mostly driven by temperature.  Using daily minimum and maximum temperatures allowed Armand Bauer and A.L. Black at the USDA-ARS Northern Great Plains Research Lab in Mandan to develop a robust growing degree models that predict the growth stage of spring wheat. The NDAWN weather observation network uses this growing degree model to predict the growth stage of spring wheat (https://ndawn.ndsu.nodak.edu/wheat-gdd-multiple-planting-dates.html).  Their model is for an average maturity variety and can be to be corrected for differences in maturity by a simple coefficient for relatively maturity.

Late Season N in Wheat - The Cliff Notes Edition 2.0

Once again there is here is interest in late-season application of nitrogen with the goal to improve the grain protein content of spring and winter wheat. Foliar applications of N during the onset of kernel fill have shown to be able to increase grain protein.

The key points of foliar applications of N on wheat to improve grain protein content follow:

  • Apply up to 10 gpa of UAN with an equal amount of water - the water is needed to reduce leaf burn.
  • DO NOT apply during the heat of the day - early evening application reduce leaf burn considerably.
  • DO NOT tankmix this N with any fungicides at Feekes 10.51, but rather apply the additional N 2 to 5 days after anthesis.
  • The probability of a response by the crop is about 80%
  • Only expect an increase of 0.5 to 1.0 full point in grain protein with the additional 30 lbs N/A
  • All varieties respond equally well to the additional N

Use the decision guide to determine whether an economic return is possibly in relationship to the price of the UAN.  Furthermore, Dr. Dave Franzen's research has clearly shown that product like N-Pact and Coron applied at their recommended, low rates of 1 to 3 gpa near, at or after flowering do not increase grain protein.    

While there is no effect on grain yield, some leaf burn is to be expected when using UAN.  Dr. Dave Franzen also suggests that leaf burning can be further reduced if  urea is dissolved in water to make a urea solution. A word of caution is that the urea to make the solution is not contaminated with biuret. Biuret or carbamylurea is the result of condensation of two molecules of urea and is an impurity in urea-based fertilizers. High quality urea contains less than 0.2% biuret.


Tuesday, June 7, 2016

NDSU urges growers to keep grain cool and dry during summer

by Dr. Kenneth Hellevang, North Dakota State University

Stored grain needs to be cool and dry during the summer, a North Dakota State University Extension Service grain-drying expert says.

"Cold or cool grain has been safely stored through the summer for many years," notes Ken Hellevang, an Extension agricultural engineer. "Keeping the grain as cool as possible should be the goal of spring and summer grain storage."

Thursday, June 2, 2016

Got weeds? U of M Extension has resources

Managing herbicide resistance and controlling resistant weeds is a challenge. The U of MN Extension Crops Team is offering new video and web resources to help manage these difficult to control weeds:
  • Weed management website – includes resources on herbicide resistance management, weed identification, herbicide application and chemistry, and research reports.
  • Herbicide resistant waterhemp (video) – Waterhemp has an extended emergence pattern, making it difficult to control. Results from a 2015 trial demonstrating the effectiveness of layering residual herbicides for herbicide-resistant waterhemp control are shown in this video.
  • Herbicide resistant giant ragweed (video series) – Due to its large seed and early emergence, giant ragweed can be difficult to control. This video series describes a study looking at alternative management practices to control this herbicide-resistant weed.

To see additional videos from the U of M Crops Team, visit: https://www.youtube.com/user/UMNCrops.

Wednesday, June 1, 2016

Wet weather raises nitrogen loss concerns

Brad Carlson, Extension educator

Recent, excessively wet weather has raised concerns over the possibility of nitrogen (N) loss in corn for some parts of Minnesota. As the calendar has now turned to June, it's likely that anywhere from half to all of the applied N, regardless of the fertilizer form or application timing, is in the nitrate form. This conversion is due to soil microbial activity and is fueled by heat and moisture. This is significant, since nitrate is susceptible to environmental loss.
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