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  1. Crop Response to Potassium Fertilizer in Ohio

    https://agcrops.osu.edu/newsletter/corn-newsletter/2024-04/crop-response-potassium-fertilizer-ohio

    of yield penalty with no K application decreases as soil K levels go above 100 ppm. If the soil test ... (2023) classified Mehlich-3 soil K levels into <70, 70-100, 100-130, 130-160, and >160 ppm to ... yield, the higher the yield increase from K fertilizer.   Generally, as the soil test K levels decreased, ...

  2. Crop Response to Phosphorus Fertilizer in Ohio

    https://agcrops.osu.edu/newsletter/corn-newsletter/2024-03/crop-response-phosphorus-fertilizer-ohio

    soil P levels go above 20 ppm. If the soil test P level is less than 20 ppm, there is an increased risk ... less than 10 ppm, the median relative yield was 87%. As the soil test P level increased above the ... the Mehlich-3 soil test P level. The Mehlich-3 soil P measures the readily available soil P for crop ...

  3. Potassium Uptake and Ohio Crop Response

    https://ohioline.osu.edu/factsheet/anr-0147

    a measure of the risk of yield loss at a given soil-test K level without fertilizer applied during the ... total K content of Ohio soils is between 12,500 ppm and 30,500 ppm (Ames & Gaither, 1913). Even ... yield. For loams and clays, this would be 170 ppm; for sandy soils, it is 130 ppm. The range of soil test ...

  4. Soil Phosphorus and Crop Response to Phosphorus Fertilizer in Ohio

    https://ohioline.osu.edu/factsheet/anr-0146

    responding to applied P can best be predicted by soil-test P levels. Recently, Culman et al. (2023) published ... 29.9% of trials, soybean in 14.2% of trials, and wheat in 36.8% trials. Critical soil test levels ranged ... Furthermore, the risk of yield loss with no P application decreased as the soil P level increased. As per the ...

  5. Forage Testing for Beef Cattle

    https://ohioline.osu.edu/factsheet/anr-0149

    0.12% Mg. High soil potassium levels are associated with increased incidence of grass tetany. The ratio ... (ppm). If the forage contains a high level of molybdenum (2 ppm) or sulfur at 0.25%, Cu could be ... samples are low in Zn. The recommended levels for zinc are between 30 and 1,000 parts per million (ppm ...

  6. Opportunities for Sub-surface Nutrient Placement in Ohio

    https://ohioline.osu.edu/factsheet/fabe-56401

    horsepower requirements, the level of tillage and soil disruption, depth of fertilizer placement, and ... while leaving the soil between these strips undisturbed. When the strip-till unit is equipped with ... leaving residue on the soil surface between the strips. Quicker spring soil warm-up compared to no-till ...

  7. Ohio’s Premier Ag Conference March 12-13 in Ada

    https://agcrops.osu.edu/newsletter/corn-newsletter/2024-05/ohio%E2%80%99s-premier-ag-conference-march-12-13-ada

    Sixty outstanding presenters with topics on agronomic crops, soil health, nutrient management, ... sessions include Soil Health, Cover Crops and No-till; Nutrient Management; Agronomic Crop Management; and ... about 4:30 p.m. Sessions will include: Soil Health, Cover Crops and No-till; Agronomic Crop Management; ...

  8. Statewide and Region Phosphorus Nutrient Use in Ohio

    https://agcrops.osu.edu/newsletter/corn-newsletter/2024-02/statewide-and-region-phosphorus-nutrient-use-ohio

    trends in mean soil test P (STP) levels between 1993 and 2015. Since 2003, Ohio's P 2 O 5 removal ... P recommendations from 1995 to today, review changes in soil test phosphorus (STP), and identify the sources of ... declines in Soil Test P. Soil test P is one factor that can mitigate chronic P loss at the edge of a field. ...

  9. Growers and Retailers Needed: Understanding Yield Response to K Applications in Ohio

    https://agcrops.osu.edu/newsletter/corn-newsletter/2024-05/growers-and-retailers-needed-understanding-yield-response-k

    consultants, retailers, and farmers have been concerned that soil K values have been decreasing.  One cause for ... Fields need to be in a corn and soybean rotation and have pH levels within acceptable range.  Fields ... field plots.  The Ohio State University will work with the farmer or consultant to collect needed soil ...

  10. Wheat Planting Management Considerations for Fall 2023

    https://agcrops.osu.edu/newsletter/corn-newsletter/2023-32/wheat-planting-management-considerations-fall-2023

    than corn or soybean, and soil test levels should be maintained between 30-50 ppm (Mehlich-3 P) for ... optimum production (Table 1). Do not add phosphorus if soil test levels exceed 50 ppm. Soil potassium ... should be maintained at levels of 100-130 and 120-170 ppm (Mehlich-3 K) on sandy soils (CEC < ...

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