C.O.R.N. Newsletter

  1. Author(s): Peter Thomison

    The recent cooler than normal temperatures may impact corn drydown. Once corn achieves physiological maturity (when kernels have obtained maximum dry weight and black layer has formed), it will normally dry approximately 3/4 to 1% per day during favorable drying weather (sunny and breezy) during the early warmer part of the harvest season from mid‑September through late September. By early to mid‑October, dry-down rates will usually drop to ½ to 3/4% per day.

    Issue: 2017-30
  2. Author(s): Peter Thomison

    According to the National Agricultural Statistics Service (http://www.nass.usda.gov/) as of Sept. 10, 69 percent of Ohio’s corn acreage was in the dent stage (R5) compared to 76 percent for the five-year average; 16 percent of the corn acreage was mature, slightly less than the five-year average, 18 percent.

    Issue: 2017-30
  3. Abnormal ears of corn
    Author(s): Peter Thomison

    When checking corn fields prior to harvest, it’s not uncommon to encounter ears exhibiting abnormal growth such as those shown below (Fig. 1), especially when the crop has experienced stress conditions. Some of these ear and kernel anomalies have a limited impact on corn production but others can affect yield and grain quality adversely. To assist with the diagnosis and management of various ear and kernel disorders, check the following: “Troubleshooting Abnormal Corn Ears” available online at http://u.osu.edu/mastercorn/

    Issue: 2017-28
  4. Author(s): Peter Thomison

    Issue: 2017-24
  5. Author(s): Peter Thomison , Author(s): Rich Minyo

      Many Ohio corn fields have been subject to excessive rainfall this year. The fields where the Ohio Corn Performance Test (OCPT) were planted are no exception. Extraordinary rainfall accumulation has occurred at nearly all OCPT sites. Rainfall accumulations from May 15 to July 18-19 (and there’s been more since then) range from 14.0 to 19.1 inches at test sites in the southwest/west central/central region.

    Issue: 2017-23
  6. Author(s): Peter Thomison

    According to the National Agricultural Statistics Service for the week ending 7-9-17, 10% of the state’s corn was silking compared to 16% for the 5-year average. Given the wide range in corn planting dates this year, some late planted (corn planted in mid-June corn) may not achieve tasselling and silking until early August. The pollination period, the flowering stage in corn, is the most critical period in the development of a corn plant from the standpoint of grain yield determination.

    Issue: 2017-21
  7. Author(s): Peter Thomison

    Strong winds associated with rain storms last week caused localized root lodging and “green snap”. The magnitude of this damage is influenced by several factors including crop stage of development and hybrid genetics.

    Issue: 2017-21
  8. The question has come in several times this year, probably due to the excessive rain, from folks wanting to know how much more nitrogen (N) to add. Recently the question came from a livestock operation.

    Issue: 2017-20
  9. Author(s): Peter Thomison

    The impact of hail damage is largely dependent on corn’s stage of development. Hail affects yield primarily by reducing stands and defoliating plants. Most of the hail damage results from defoliation. Generally, the corn plant is little affected by hail prior to the 6-leaf collar stage because the growing point is at or below the soil surface and in the leaf whorl.

    Issue: 2017-19
  10. Author(s): Peter Thomison , Author(s): Mark Loux

    When widespread replanting occurs as it did this year, situations arise in which the original corn planting is not entirely killed and competes with the replanted corn. To make room for a replant, several herbicide treatments are recommended and these were described in an earlier C.O.R.N. Newsletter (https://agcrops.osu.edu/newsletter/corn-newsletter/2017-14/more-killing-corn-replant-situation). However, these treatments are sometimes not applied.

    Issue: 2017-19