Corn Newsletter : 2014-35

  1. Author(s): Peter Thomison

    Black layer is the stage in corn development at which kernel growth ceases and maximum kernel dry weight is achieved (also referred to as “physiological maturity”).  A killing fall frost prior to physiological maturity can cause premature leaf death or whole plant death.  This occurred over the weekend when temperatures dropped below freezing in some late planted Ohio corn that had yet “black-layered”.  The impact of frost injury to immature corn was discussed in the

  2. Figure A & B. Soybean pods curling after shattering and Soybean harvest losses in 2012 after shatter
    Author(s): Laura Lindsey

    Soybean pod shattering is not completely understood.  Through breeding efforts (beginning approximately 5,000 years ago when soybean was first thought to be domesticated), soybean plants have gained pod shattering resistance (Dong et al., 2014).  However, certain environmental conditions can lead to pod shattering.

    Last week, I received a picture of empty, curled soybean pods which is an indication of shattering loss (top picture).  This particular field received

  3. Author(s): Mark Sulc

    Jack Frost will be visiting us soon.  Several forage species can be extremely toxic soon after a frost because they contain compounds called cyanogenic glucosides that are converted quickly to prussic acid (i.e. hydrogen cyanide) in freeze-damaged plant tissues.  We will discuss those first below.  Others species have an increased risk of causing bloat when grazed after a frost, we will discuss those at the end of this article.

    Species that can develop toxic levels of

  4. Author(s): Mark Sulc

    Some forage species can develop prussic acid poisoning potential when harmed by frost and management practices should be followed to prevent poisoning of livestock (see accompanying article).  If doubt remains regarding the safety of the forage, it can be tested for prussic acid (cyanide) content.

    Keep in mind that prussic acid is a gas, so it is difficult to detect in samples sent to labs.  Sample handling is extremely critical to ensure that the lab test will be

  5. Author(s): Mark Loux

    There is plenty of information on fall herbicide treatments in the C.O.R.N. newsletter archive and on other university websites.  Our philosophy on this has not changed much over the past decade.  A few brief reminders follow:

    1.  When to spray?  Anytime between now and Thanksgiving will work, and possibly later.  We have applied into late December and still eventually controlled the weeds present at time of application.  Once hard freezes start to occur, there is usually a

  6. Author(s): Jim Noel

    The pattern discussed last week will continue this week.  Expect an active weather pattern as a storm system crosses Ohio Tuesday with lingering light showers Wednesday and Thursday keeping field work at a minimum this week. Drier weather will return by the weekend and much of next week outside of some rain maybe on this coming Monday.

    Temperatures will be on a typical roller coast ride starting the week warm then cooler before warmer later next week.  Overall, October will

  7. Author(s): Sarah Noggle

    Farmers interested in planting cover crops to improve soil health now have two resources available to utilize.  The two items are an expanded and updated second edition of the Midwest Cover Crops Field Guide and also the Midwest Cover Crops Council cover crops selector tool. 

    The second edition of the pocket guide was release on Monday, September 22, 2014 and was produced by the Midwest Cover Crops Council and published via Purdue University.

    Growers plant cover

  8. Author(s): Greg LaBarge, CCA

    A survey of agricultural retailers was undertaken to provide a benchmark of current practice adoption of soil sampling, type of spatial sampling, placement and timing of nutrient application currently being used in Ohio’s two major watersheds. The responding retailers provided services on 3.8 million acres representing 39% of Ohio’s row crop and hay production acres with 1,920,450 in Lake Erie Watershed while 1,910,050 acres were in the Ohio River Watershed. Eighty

About the C.O.R.N. Newsletter

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.