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Some Agronomic Terms

Great Lakes Protections Fund Grant 833 – Development of a Phosphorus Soil Test Metric to Reduce Dissolved Reactive Phosphorus Loading to Lake Erie. Team Meeting # 5 July 23-24, 2013.

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Some Agronomic Terms

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  1. Great Lakes Protections Fund Grant 833 – Development of a Phosphorus Soil Test Metric to Reduce Dissolved Reactive Phosphorus Loading to Lake Erie. Team Meeting # 5 July 23-24, 2013 Agenda Item 2. A review of basic concepts and terminology related to phosphorus movement from cropland to streams and rivers.

  2. Some basic concepts and related terms that will likely be used Some Agronomic Terms Particulate Phosphorus Losses Soil System Terms Dissolved Reactive Phosphorus Losses See handout – Some basic concepts and terminology …

  3. Some Agronomic Terms No additional P fertilizer recommended What is the agronomic range for soil test values? Critical STP for wheat and alfalfa Critical STP for corn and soybeans

  4. Tillage Terminology Other terms Mold board plowing (inversion tillage) Vertical tillage Incorporation

  5. Sandusky Watershed Stratified Soil Testing Program Soil Profile

  6. Revised diagram for pathways of dissolved phosphorus runoff. Dissolving and runoff of broadcast fertilizer granules before incorporation. Macropores Tile drainage

  7. A comparison of maintenance phosphorus fertilizer application rates and watershed export rates of total phosphorus and dissolved reactive phosphorus. Sediment Delivery Ratio --- lbs/acre loss at watershed divided by lbs/acre at edge of field Enrichment Ratio --- mg P/kg SS at edge of field divided by mg P/kg soil in the cropland soil.

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