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Comprehensive Guide to Soil Fertility for Sorghum Growth

Explore the essential nutrients for successful sorghum cultivation, including nitrogen, phosphorous, and potassium levels, pH considerations, and micronutrient requirements. Learn about soil testing, nutrient deficiencies, and appropriate fertilization methods for optimal yield. Take advantage of free soil sample processing services offered by Co-Ops and fertilizer dealers. Improve your crop's health and productivity with valuable insights from Brian Arnall at Oklahoma State University.

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Comprehensive Guide to Soil Fertility for Sorghum Growth

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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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