Sorghum fertility
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Sorghum Fertility. Brian Arnall Oklahoma State University Dept Plant and Soil Sciences. Outline. Nitrogen Phosphorous Potassium pH Micro’s. Soil Testing. OSU, Ward, ect. $10 - $15 20 lb N $9 20 lb P $7.2 ¼ Ton Lime $5-10 Per Acre!!!!! Some Co-Ops and Fertilizer Dealers,

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Sorghum Fertility

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Sorghum Fertility

Brian ArnallOklahoma State UniversityDept Plant and Soil Sciences


Outline

  • Nitrogen

  • Phosphorous

  • Potassium

  • pH

  • Micro’s


Soil Testing

  • OSU, Ward, ect. $10 - $15

    • 20 lb N $9

    • 20 lb P $7.2

    • ¼ Ton Lime $5-10

      • Per Acre!!!!!

  • Some Co-Ops and Fertilizer Dealers,

    • Take and Process samples for FREE!!!!!!


  • Nitrogen

    • Determined by Yield Level


    Strips and Sensors


    Phosphorous

    • Independent of Yield


    Potassium

    • Independent of Yield


    Variability


    pH Issues

    Mixed Reports, some state more Al tolerant and others show less.


    Micronutrients Needed by all Crops

    *Range of total in soils. From Chemical Equilibria in Soils. W.L.Lindsay, 1979. Wiley & Sons.

    **Calculated for 2 ton crop yield (67 bushel wheat).


    Nutrients not found deficient in Oklahoma crops.

    • Calcium.

      • Liming prevents Ca deficiency.

    • Manganese.

    • Copper.

    • Molybdenum.


    Nutrients seldom found deficient in Oklahoma crops.

    • Magnesium.

    • Sulfur.

    • Iron.

    • Zinc.

    • Boron.

    • Chlorine.


    MgYellowing between veins, old leaves Dolomitic Lime Sul-po-Mag, K-Mag


    SulfurCan look like N, Yellowing between veinsGyp, S, Ammon Sulfate


    IronYellowing between veins, new leavesFerrous Sulfate, ect


    Micro Nutrients

    • Zinc, Bronze between Margin and Midrib. Bleaching on either side of Midrib Zinc Sulfate, Zinc Chloride, Zinc Chelate

    • Boron, Borax

    • Chloride, Upper Leave Wilt,Muriate of Potashwhich K is usually also deficient


    Soil Testing

    Just Do It!


    Thank You!

    • Corn and Sorghum Nutrient Need Pete’s Sheets coming soon


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