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  1. Nitrogen

    https://agcrops.osu.edu/node/3482

    a sufficient quantity of plant available nitrogen (nitrate and/or ammonium) to crops, while minimizing N loss ... conversion to nitrate which can reduce N loss. Nitrogen Sources Nitrogen fertilizer source trials have ... of fertilizer source should be based on application timing and placement, cost, availability ...

  2. Soil PH and Lime Recommendations

    https://agcrops.osu.edu/node/3483

    Soil pH is one of the most important properties in determining the cycling and availability of ... soil nutrients. Soil testing regularly and applying lime to maintain recommended pH levels should be ... the first step growers take to assure crops have sufficient availability of nutrients. Soil pH should ...

  3. Calcium, Magnesium, and Sulfur

    https://agcrops.osu.edu/node/3477

    adequately supply these nutrients for plant growth. A standard soil test measures the relative availability ... best diagnostic tool for confirming S availability. Excessive use of K fertilizers can greatly reduce ... level. Potassium recommendations above the critical level are less than crop removal so as to discourage ...

  4. Soil Sampling, Handling, and Testing

    https://agcrops.osu.edu/node/3484

    strategy is always a trade-off between the collection and analysis cost and the level of detail of the ... same depth each sampling period to ensure changes in soil test levels can be reliably tracked over ... due to the effect of moisture on soil pH and nutrient levels, particularly K. Intervals Between ...

  5. Executive Summary

    https://agcrops.osu.edu/node/3486

    profitability (maximum return to N (MRTN)) available at  cnrc.agron.iastate.edu. Framework for P and ... go.osu.edu/mehlich. Critical levels for all crops are largely consistent with the original recommendations, except for ... revising the values to reflect Mehlich-3 as the soil extractant. Critical levels for corn silage and ...

  6. Phosphorus and Potassium

    https://agcrops.osu.edu/node/3478

    on a build-up and maintenance approach. This framework strives to build soil test levels up to and ... beyond a critical level, then maintain these levels over time. The original tri-state recommendations had ... fertilizer to build soil test levels) if soils test below the critical level or are “deficient.” The ...

  7. Quick Reference Guide to Tri-State Fertilizer Recommendation Changes

    https://agcrops.osu.edu/node/3488

    Default soil test P and K levels now based on Mehlich-3. These recommendations are consistent with current ... soil test extracts. Details P critical level 20 ppm for corn and soybean, 30 ppm for wheat and alfalfa ... (Mehlich-3 P). This update is based on extensive field trials over past decade. Details K critical levels are ...

  8. Micronutrients

    https://agcrops.osu.edu/node/3476

    exist, Mehlich-3 extractable micronutrients likely relate meaningful information about availability of ... extractant to estimate micronutrient availability. But how effective the “universal” Mehlich-3 extraction is ... at characterizing soil micronutrient availability is not well understood, as recommended ...

  9. Potassium Fertilizer Recommendations

    https://agcrops.osu.edu/node/3480

    K recommendations differ from grain crops when soils are above the critical level. Note the equations and quick ... For complete information, please see the full version which we anticipate being available soon from  ...

  10. Tri-State Fertilizer Recommendations- Additional Resources

    https://agcrops.osu.edu/node/3487

    agry.purdue.edu/ext/corn/news/timeless/nitrogenmgmt.pdf Phosphorus and Potassium/Mehlich-3 extraction Culman, Steve, Meredith Mann, Stuti Sharma, Muhammad ... levels and crop response Culman, Steve, Muhammad Tariq Saeed, and Anthony Fulford. 2017. “Ohio Data that ... information, please see the full version which we anticipate being available soon from The Ohio State ...

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