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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

Sorghum Fertility

Brian ArnallOklahoma State UniversityDept Plant and Soil Sciences


Outline
Outline

  • Nitrogen

  • Phosphorous

  • Potassium

  • pH

  • Micro’s


Soil testing
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
    Nitrogen

    • Determined by Yield Level



    Phosphorous
    Phosphorous

    • Independent of Yield


    Potassium
    Potassium

    • Independent of Yield



    Ph issues
    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
    Nutrients not found deficient in Oklahoma crops.

    • Calcium.

      • Liming prevents Ca deficiency.

    • Manganese.

    • Copper.

    • Molybdenum.


    Nutrients seldom found deficient in oklahoma crops
    Nutrients seldom found deficient in Oklahoma crops.

    • Magnesium.

    • Sulfur.

    • Iron.

    • Zinc.

    • Boron.

    • Chlorine.


    Mg yellowing between veins old leaves dolomitic lime sul po mag k mag
    MgYellowing between veins, old leaves Dolomitic Lime Sul-po-Mag, K-Mag


    Sulfur can look like n yellowing between veins gyp s ammon sulfate
    SulfurCan look like N, Yellowing between veinsGyp, S, Ammon Sulfate


    Iron yellowing between veins new leaves ferrous sulfate ect
    IronYellowing between veins, new leavesFerrous Sulfate, ect


    Micro nutrients
    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 testing1
    Soil Testing

    Just Do It!


    Thank you
    Thank You!

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