C.O.R.N. Newsletter: 13-2021

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.

  1. CFAES Ag Weather System 2021 Near-Surface Air and Soil Temperatures/Moisture

    Author(s): Aaron Wilson, Greg LaBarge, CPAg/CCA

    A cold, wet pattern put a damper on warming soils this week. In fact, all stations are reporting daily average soil temperatures cooler than one week ago (Fig. 1). Northern sites (e.g., Ashtabula and Northwest) have fallen into the 40s, with 50s being reported elsewhere. Warming will be slow again this week, with overnight lows in the 30s expected for several days. However, as air temperatures reach climatological average (highs in the mid-60s to low 70s) by the weekend, soil temperature should recover.

  2. Growing Degree Days vs. Calendar Days – How Long Will Emergence Take?

    Author(s): Alexander Lindsey, Greg LaBarge, CPAg/CCA

    When we examine crop emergence post-planting, two factors can impact speed of emergence – soil moisture content and soil temperatures. If soil temperatures are lower, it can take more calendar days for emergence to occur meaning rowing corn may take a little more time. In the Ohio Agronomy Guide, emergence should begin to occur after approximately 100 air GDDs.

  3. Numbers of Black Cutworm and True Armyworm Moths Increasing but Remain Relatively Low

    Author(s): Andy Michel, Kelley Tilmon, Curtis Young, CCA, Clifton Martin, CCA, Lee Beers, CCA, Beth Scheckelhoff, Eric Richer, CCA, Cindy Wallace, Mark Badertscher

    Over the past few weeks, we have caught an increasing number of both black cutworm and true armyworm moths in our traps (see https://docs.google.com/spreadsheets/d/1yl_FeI5IJKkBVfdvKJuE6pWkd58OVhCyHeZ6SZM-ePE/edit?usp=sharing ).

  4. Adapting Burndown Programs to Late-Planted Situations

    Author(s): Mark Loux

    It’s déjà vu all over again.  We have run this article every few years, and it seems like maybe the frequency is increasing as we deal with wet and cold weather that delays planting.  The questions about this have not changed much, and neither have the suggestions we provide here.  One of the most common questions, predictably, is how to kill glyphosate-resistant marestail and giant ragweed and generally big weeds in soybeans when it’s not possible to delay planting long enough to use 2,4-D ester (Enlist soybeans excluded since there is no wait to plant).  Overwintered marestail plants beco

  5. Estimating Fiber Content of Alfalfa in Fields Across Ohio

    Author(s): Angela Arnold, Mark Sulc, Les Ober, CCA

    Alfalfa stands in Ohio had some early growth due to the warmer temperature in early April. Although it’s been cooler over the past couple of weeks, alfalfa growth has slowly been progressing. While fields start to dry out this week it’s a good idea to start thinking about estimating neutral detergent fiber (NDF) in pure alfalfa stands.

    It is common for many growers to base harvest decisions primarily on alfalfa maturity; however, variable weather conditions affect the rate of bud and flower development in alfalfa and this method can be inaccurate.

  6. Additional Application of Late-Season Nitrogen to Winter Wheat

    Author(s): Laura Lindsey, Ed Lentz, CCA

    We’ve had several days of extremely wet weather, and there are some questions regarding the need for additional nitrogen fertilizer. Last week, wheat was between Feekes 8 and 10.2, depending on the area within the state. At this point in the growing season, additional nitrogen fertilizer applied to winter wheat is unlikely to increase grain yield.

  7. Fertilizer Training for New Applicators

    Author(s): Chris Zoller, David Marrison

    Do you apply fertilizer to more than 50 acres of land?  If so, the Ohio Department of Agriculture requires applicators to obtain a Fertilizer Certificate.  The Tuscarawas and Coshocton County offices of Ohio State University Extension will sponsor a training at 7pm on Wednesday, May 19.  The training will be held at the Sugarcreek Stockyards, 102 Buckeye St., Sugarcreek, Ohio.  This three-hour class is for those wishing to obtain a fertilizer certificate and will review laws, water quality, soil sampling & analysis, and nitrogen and phosphorus management.

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