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  1. Disease Resistance and Tolerance

    https://agcrops.osu.edu/node/4416

    use of hybrid resistance and tolerance to minimize crop losses.  Hybrid response to high population ... shown positive yield response to higher populations cannot be grown at high plant densities because of ... the increased risk of lodging at harvest. Lodging reduces yields and slows the harvest operation. ...

  2. Yield Potential and Stability

    https://agcrops.osu.edu/node/4414

    Choose hybrids that have produced consistently high yields across a number of locations and/or ... years. The Ohio Corn Performance Tests (OCPT) indicate that hybrids of similar maturity vary in yield ... high yields; instead, look for stability in performance across environments.  Most of the hybrids ...

  3. Growing Degree Day (GDD) Maturity Rating System

    https://agcrops.osu.edu/node/4413

    (T min) is less than 50 degrees Fahrenheit, 50 is used to determine the daily average. The high ... calculation method most commonly used for corn in the U.S. is the 86/50 cutoff method. GDD are calculated as ... the average daily temperature minus 50.  If the maximum daily temperature (T max) is greater than 86 ...

  4. Gibberella Ear Rot and Mycotoxins in Corn: Sampling, Testing, and Storage

    https://ohioline.osu.edu/factsheet/AC-52

    screening steps. Semi-quantitative tests estimate vomitoxin at or above certain levels (>5 ppm) or within ... (DON), also called vomitoxin. As a result, high levels of Gibberella ear rot severity and moldy grain are ... usually accompanied by high levels of vomitoxin. Mycotoxins are harmful to both humans and animals. ...

  5. Grain Quality

    https://agcrops.osu.edu/node/4417

    indicated that protein and oil levels vary considerably from test to test (Table 4-8). Some normal dent corn ... and protein are evident in under certain testing conditions, the Ohio Corn Performance Test has ... hybrids produced primarily for grain exhibit elevated protein and oil levels. Environmental conditions ...

  6. Making Replant Decisions

    https://agcrops.osu.edu/node/4422

    minus 79, or 2 percentage points. At a yield level of 150 bushels per acre, this increase would amount ... beneath or at the soil surface (up until about the six-leaf collar stage). If new leaf growth appears ... stand was reduced to 15,000 plants per acre as a result of saturated soil conditions and ponding. ...

  7. Don't Miss Out on 2023 Soil Health Webinar Series

    https://agcrops.osu.edu/newsletter/corn-newsletter/2023-01/dont-miss-out-2023-soil-health-webinar-series

    Join the OSU Extension Agronomic Crops Team 2023 Soil Health Webinar series for a Thursday morning ... series about soil health. You won’t want to miss out on this year’s line-up of farmers and academic ... experts covering a wide range of soil health topics as they dig below the surface to investigate new ...

  8. Converting between Mehlich-3, Bray P, and Ammonium Acetate Soil Test Values

    https://ohioline.osu.edu/factsheet/anr-75

    Bray P. When only soil test values in the agronomic range were considered (less than 50 ppm Bray P), ... relationships between Mehlich-3, Bray P, and Ammonium Acetate soil test extractants in the Tri-State Region. ... 3–1170 ppm, and Mehlich-3 K values ranged from 25–899 ppm. We examined relationships with all soil test ...

  9. Stalk Quality and Lodging

    https://agcrops.osu.edu/node/4415

    harvest at relatively high moisture levels (above than 25 percent) or are producing corn for silage, then ... stalk rind), short plant height and ear placement, and high staygreen potential. Staygreen refers to ... hybrids are at risk from wind injury when they are growing rapidly prior to tasseling. The use of growth ...

  10. Plant Populations and Seeding Rates

    https://agcrops.osu.edu/node/4421

    For fields with very productive soils and exceptionally high yield potential, final stands greater ... planting above recommended rates (unless lodging becomes more severe at higher population levels).  Plant ... there may be little benefit from using high plant populations much above 30,000 plants per acre. ...

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