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Sorghum Fertility

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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  1. Sorghum Fertility Brian ArnallOklahoma State UniversityDept Plant and Soil Sciences

  2. Outline • Nitrogen • Phosphorous • Potassium • pH • Micro’s

  3. 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!!!!!!

  4. Nitrogen • Determined by Yield Level

  5. Strips and Sensors

  6. Phosphorous • Independent of Yield

  7. Potassium • Independent of Yield

  8. Variability

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

  10. 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).

  11. Nutrients not found deficient in Oklahoma crops. • Calcium. • Liming prevents Ca deficiency. • Manganese. • Copper. • Molybdenum.

  12. Nutrients seldom found deficient in Oklahoma crops. • Magnesium. • Sulfur. • Iron. • Zinc. • Boron. • Chlorine.

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

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

  15. IronYellowing between veins, new leavesFerrous Sulfate, ect

  16. 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

  17. Soil Testing Just Do It!

  18. Thank You! • Corn and Sorghum Nutrient Need Pete’s Sheets coming soon

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