Blog Archives

JenREES 4-5-20

Youth/Family Support: Last week I shared this link for many hands-on learning activities: Two more resources that may be helpful for families right now: Helping Children Cope with stress and change: and Reading for Resilience which helps children cope with storybooks:

Checking grain bins: A local farmer suggested to share a reminder to keep checking on grain with temps warming up and much grain in storage. It’s also so important to be safe with grain handling. The following is from Dr. Ken Hellevang with North Dakota State University (full article at: “The stored grain temperature increases in the spring not only due to an increase in outdoor temperatures but also due to solar heat gain on the bin. Solar energy produces more than twice as much heat gain on the south wall of a bin in spring as it does during the summer.

Hellevang recommends periodically running aeration fans to keep the grain temperature near or below 30 degrees until the grain is dried if it exceeds recommended storage moisture contents, and below 40 degrees as long as possible during spring and early summer if the grain is dry. Night air temperatures are near or below 30 degrees in April and 40 degrees in May. Soybean oil quality may be affected in less than four months if even 12% moisture soybeans are stored at 70 degrees.

Cover the fan when it is not operating to prevent warm air from blowing into the bin and heating the stored grain. Hellevang also recommends ventilating the top of the bin to remove the solar heat gain that warms the grain. Provide air inlets near the eaves and exhausts near the peak or use a roof exhaust fan… Grain temperature should be checked every two weeks during the spring and summer. Grain also should be examined for insect infestations. Check the moisture content of stored grain to determine if it needs to be dried. Remember to verify that the moisture content measured by the meter has been adjusted for grain temperature.

Corn needs to be dried to 13% to 14% moisture for summer storage to prevent spoilage. Soybeans should be dried to 11% to 12%, wheat to 13%. The allowable storage time for 13% moisture soybeans is less than 100 days at 70 degrees. Corn – For natural air-drying, assure that the fan’s airflow rate is at least 1 cubic foot per minute per bushel (cfm/bu) and the initial corn moisture does not exceed 21%. Start the fan when the outdoor temperature averages about 40 degrees. Soybeans – Use an airflow rate of at least 1 cfm/bu to natural air-dry up to 15% to 16% moisture soybeans. Start the fan when the outdoor temperature averages about 40 degrees.”

Burndown and pre-plant herbicide apps: Anticipating this week’s nicer weather, I’ve also received several questions on burndown and pre-plant herbicide applications and weather impacts on control. Dr. Amit Jhala wrote two articles in this week’s UNL CropWatch at Sunny days with temperatures above 40F for day and night, and even better when temps are climbing to the upper 50s and above provide better control than if it’s cooler than 40F. Glyphosate works faster during sunny conditions when it is 60-75F and remains there a few hours. The articles also list rain-fast period and planting interval restrictions (as would the product labels). If you’re looking for a general idea on potential residual activity of herbicides for overlapping residual, check out pages 23-24 of the 2020 Guide for Weed Management.

My colleague Dr. Nathan Mueller shared in his blog:, “A 2007-2009 UNL study conducted in Lincoln and Clay Center found that in 5 of the 6 site-years (2 site per year for 3 years is 6 site-year) that not controlling winter annual weeds prior to corn and soybean planting resulted in greater than a 5% yield loss and a 10% loss in 4 of the 6 site years.”

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Sharing some encouragement from my neighborhood to yours 🙂 Individuals within farm families could also write messages to each other!

JenREES 10-14-18

Well, it’s been an interesting fall and I wish I had something more encouraging for our farmers this week…there have been some beautiful days/sunsets when the sun shone! Difficult with soybeans germinating in pods, popping pods, and the snow with so much harvest to go…hang in there and be safe when harvest resumes!

Regarding grain drying questions, Dr. Ken Hellevang at North Dakota State University has written several CropWatch articles at to help us. Here’s a few excerpts.

For those with questions about drying soybeans when harvesting at high moisture to get them out of the field: “Soybeans at 11% moisture have storage characteristics similar to wheat or corn at about 13.5% moisture, so 16% moisture soybeans might be expected to store similarly to about 19% moisture corn. It is important to be able to aerate the soybeans to keep them cool.

The amount of natural air drying that will occur in late October and early November is limited. The equilibrium moisture content of soybeans for air at 40°F and 70% relative humidity is about 12%. With this air condition drying should occur with soybeans above 12% moisture. However, the drying rate will be slow at typical in-bin drying airflow rates. An airflow rate of 1 cubic foot per minute per bushel (cfm/bu) is expected to dry 18% moisture soybeans in about 60 days. With an airflow rate of 1.5 cfm/bu the drying time is reduced to about 40 days. The drying time for 16% moisture soybean is slightly less. The drying time of 16% moisture soybeans is about 50 days. Adding supplemental heat to raise the air temperature by 3 to 5 degrees will permit drying the soybeans to about 11% moisture in about 40 to 45 days. Increasing the airflow rate proportionally reduces the drying time.

The moisture-holding capacity of air is reduced at lower air temperatures. As average air temperatures approach 35°F, natural air drying becomes inefficient and is not economical. Adding heat would cause the beans on the bottom of the bin to be dried to a lower moisture content and it would increase drying speed only slightly. Cool the soybeans to between 20°F and 30°F for winter storage and complete drying in the spring. Start drying in the spring when outdoor temperatures are averaging about 40°F.”-Ken Hellevang NDSU. See more about drying soybeans with heat including considerations for fire risk at

Cooling Grain: “Cool grain with aeration to extend the allowable storage time and reduce the potential for insect infestation. Temperatures below about 60°F reduce insect reproduction. Insects are dormant below about 50°F, and extended exposure to temperatures below about 30°F can kill insects. Cooling grain as outdoor temperatures cool will reduce moisture migration and the condensation potential near the top of the grain pile. Also, the grain should be cooled because moisture content and temperature affect the rate of mold growth and grain deterioration. The allowable storage time approximately doubles with each 10-degree reduction in grain temperature.

Grain should be cooled whenever the average outdoor temperature is 10 to 15 degrees cooler than the grain. Cool it to near or below 30°F for winter storage in northern states and near or below 40°F in southern states. Aeration ducts need to have perforations sized and spaced correctly for air to enter and exit the ducts uniformly and to obtain the desired airflow through the grain. The maximum spacing for aeration ducts is equal to the grain depth to achieve acceptable airflow uniformity.”-Ken Hellevang NDSU. You can view Ken’s website at:

Weed Science School Oct. 31 near Mead will address current weed science issues and recommendations for improving herbicide applications. The school will be held at the Eastern Nebraska Research and Extension Center near Mead, starting at 8:45 a.m. and ending at 4 p.m. Topics include: overview of weed control in Nebraska, NDA procedure to investigate off-target dicamba injury, industry perspective on herbicide discovery, 15 years of researching waterhemp, forensic analysis for dicamba injury, ultra micro rates of dicamba on soybean, weed ID, cover crops and weed suppression, and what does/doesn’t work in managing herbicide drift. The school is free and CCA credits will be available. Please register here:

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