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Showing posts from April, 2017

And then it snowed...any free N with that?

by Jochum Wiersma, Small Grains Specialist, University of Minnesota
With the 5 inches of snow or so that fell overnight in Crookston, I was asked earlier this morning how much free N we received with that. Ron Gelderman, former Professor & SDSU Extension Soils Specialist, wrote an article a few years ago for iGrow on how much N is deposited when it snows in early spring. This is a re-posting of his original article.

When it snowed in Brooking, SD in the early spring of 2013 they received 9 inches of snow . This contained the equivalent of about 2 inches of water. The nitrate-N content of the snow was 0.4 ppm while the ammonium-N content was 0.3 ppm. This was equivalent to only 0.3 pounds-per-acre of available nitrogen. Not exactly a windfall of nitrogen, but also very typical nitrogen precipitation concentrations for this area.

The National Atmospheric Deposition Program (NADP) has measured nitrogen and other nutrients in precipitation for a number of stations around the country …

It's Not All About Herbicides: Three key tactics for managing weeds

Lizabeth Stahl, Jared Goplen, and Lisa Behnken, Extension Educators - Crops

Weed management tools can be divided into three main categories: mechanical, cultural, and chemical. Historically in conventional systems, chemical control options, or herbicides, have been relied on heavily.

Herbicide-resistant weed populations, however, are limiting herbicide options and effectiveness in many fields. Implementing non-chemical options, such as cultural and mechanical control tactics, can help make weed management systems more effective and durable. Understanding and considering weed biology is a key step in developing a successful program. To develop a more robust weed management program, consider the following three key strategies:

Read more at Minnesota Crop News . . . 

Alfalfa winter injury in Minnesota

Photo 1. Severely winter-injured alfalfa in Carver County, 2013. Photo courtesy of Dave Nicolai Jared Goplen, Lisa Behnken, and Dan Martens

As the weather warms and the 2017 growing season gets rolling, it is time to evaluate alfalfa stands for winterkill and winter injury. There have been numerous reports of alfalfa fields across Minnesota with varying levels of winter injury and winterkill. Many reports are of low areas in the field suffering the greatest damage, with affected field areas ranging from 10 – 40%. Lack of snow cover along with cold temperatures, freezing and thawing in February, and ice sheeting are some possible causes for winter injury and winterkill this year.

Photo 2. Plants from left to right: 1) dead plant with soft root 2) asymmetrical growth, likely will not survive 3) new spring buds growing after winter injury. Plant will likely survive but be slightly delayed 4) Healthy plant with firm root and vigorous growth. Photo courtesy of Dan Martens.
Photo 3. Severely i…

Soil Health Field Day | June 28, 2017 | Morris, MN @ West Central Research and Outreach Center

Here is information on an upcoming joint UMN and NDSU Soil Health Field Day to be held in Morris, MN on June 28.

2017 Date and location Date & time: Wednesday, June 28, 9:30 a.m. – 4:00 p.m.Location: West Central Research and Outreach Center (WCROC), 46352 MN–Hwy 329, Morris, MN (map)Program cost: There is no cost to attend. Registration is limited to 150 participants, so register soon!

Registration is limited to 150, so sign up now !

Details of the program and registration are online:

Got Waterhemp? Layer Residual Herbicides to Maintain Control Lisa Behnken, Fritz Breitenbach, Jeff Gunsolus, Liz Stahl, and Phyllis Bongard

Tall waterhemp (Amaranthus tuberculatus) is expanding its reach across Minnesota, and herbicide-resistant populations are becoming more commonplace. 
Most waterhemp populations have been resistant to ALS (Group-2) herbicides, such as Pursuit, for a while. In addition, glyphosate-resistant (Group-9) populations were first reported in 2007, and PPO-resistant (Group-14) populations were confirmed in southern Minnesota the past two growing seasons. Herbicides in Group-14 include Cobra, Flexstar and Spartan. 
To add to management challenges, some waterhemp populations have developed resistance to two or all three herbicide groups. In this situation, what herbicide control options are left?
Read more  >>
links will direct you to the original article posted in Minnesota Crop News, posted MONDAY, APRIL 10, 2017