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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.

slide14

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.
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
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