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Agronomic Crops Network

Ohio State University Extension

CFAES

C.O.R.N. Newsletter

  1. Abnormal ears of corn

    Troubleshooting Ear and Kernel Disorders in 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

  2. Does Tillering Impact Corn Yield?

    Author(s): Peter Thomison

    Issue: 2017-24

  3. Assessing the Success or Failure of Pollination in Corn

    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

  4. Pollination Underway in April Planted Corn

    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

  5. Wind Damage in Corn - “Green Snap” and Root Lodging

    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

  6. Manure, PSNT and N recommendations

    Author(s): Greg LaBarge, CPAg/CCA

    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

  7. Hail injury to corn varies depending on development stage

    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

  8. Is yield jeopardized when replants result in excessive stands?

    Author(s): Peter Thomison

    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
  9. ACRE Intern Michael Schmenk scouts fields for Black Cutworm

    Undergraduate Agronomic Crop Internship Program

    Author(s): Steve Culman

    This summer a cohort of undergraduate interns are working alongside OSU Extension County Educators to conduct on-farm research. The Agronomic Crop Research Experience (ACRE) interns are placed in county offices throughout the state and work with county educators and state specialists to support on-farm research and extension activities. The program has the goals of 1) training the next-generation of agronomists, 2) empowering locally-directed on-farm research, and 3) identifying solutions to critical agronomic issues in Ohio.

    Issue: 2017-18

  10. Using accumulated heat units to predict leaf development in corn

    Author(s): Peter Thomison

    When estimating yield losses in corn due to hail, frost, and other types of plant injury, it’s essential to establish the stage of plant growth at the time damage occurred. It’s also important to know corn stage of development in order to apply post-emergence chemicals effectively with minimum crop damage. Counting leaf collars to determine the vegetative stage is feasible until the lower leaves can no longer be identified. At about the V6 (six leaf collar) stage, increasing stalk and nodal growth combine to tear the smallest lower leaves from the plant.

    Issue: 2017-17

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