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  1. 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 ...

  2. 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 ...

  3. Grapevine Nutrient Management: Petiole Sampling and Analysis

    https://ohioline.osu.edu/factsheet/hyg-1438

    availability. However, there is a poor relationship between soil and plant nutrient levels. While a soil may be ... adequate levels of another nutrient while the soil test indicates a deficiency. This poor relationship may ... Manganese (Mn) 25–1,000 ppm 3 31–150 ppm Iron (Fe) 30–100 ppm 31–50 ppm Copper (Cu) 5–15 ppm 5–15 ppm Boron ...

  4. Plan Now for Fall Fertilization of Perennial Forages

    https://agcrops.osu.edu/newsletter/corn-newsletter/2022-26/plan-now-fall-fertilization-perennial-forages

    When soil test P exceeds the agronomic level of 50 PPM, there is increased  potential of P losses into ... For example, many dairies have high levels of soil P, making the expense of fertilizer P unnecessary. ... over-application harms the environment and can harm animals fed those forages. A recent soil test should always ...

  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. Developing Phosphorus and Potassium Recommendations for Field Crops

    https://ohioline.osu.edu/factsheet/AGF-515

    + (0.05 x CEC))] + (YP x CR) + 20 CL is the critical level (100 ppm at a CEC of 10), STL is the soil test ... test results are based on soil calibration studies that correlate soil test levels to crop yield ... crop (buildup stage). Once soil test values reach the critical soil test level, a maintenance approach ...

  7. 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. ...

  8. 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 ...

  9. Interpreting a Soil Test Report

    https://ohioline.osu.edu/factsheet/agf-0514

    suitability to grow a chosen crop. Phosphorous and potassium soil test levels help us know if fertilizer is ... values is needed if they are not reported as ppm using a Mehlich 3 soil test. Soil test values reported ... in pounds per acre are converted to ppm by dividing pounds per acre by 2. If phosphorus soil test ...

  10. 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 ...

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