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Using Sensors and Lime Reference Strips to Manage Soil Acidity

Using Sensors and Lime Reference Strips to Manage Soil Acidity. Hailin Zhang Randy Taylor Oklahoma State University. Acid Soils in Oklahoma. Variety Response to Soil pH. Limed. Not Limed. Custer, Ok101, Jagalene, Jagger, 2174, AP502Cl, Ok102, 2137. pH 5.1. pH 4.5.

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Using Sensors and Lime Reference Strips to Manage Soil Acidity

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  1. Using Sensors and Lime Reference Strips to Manage Soil Acidity Hailin Zhang Randy Taylor Oklahoma State University

  2. Acid Soils in Oklahoma

  3. Variety Response to Soil pH Limed Not Limed Custer, Ok101, Jagalene, Jagger, 2174, AP502Cl, Ok102, 2137

  4. pH 5.1 pH 4.5

  5. Production Induced Soil Acidity No-till Normal tillage

  6. How to deal with acid problems? • Band phosphate fertilizer with seeds to tie up Al • Plant Al tolerant wheat varieties • Apply aglime to neutralize acidity • Do nothing

  7. Long-term Liming on WheatHaskell, OK

  8. Relative Fall Wheat Forage Yield

  9. Cost and Benefit at 1.25 tons/A Cost

  10. Soil pH changes with time after lime was applied at 7 lime rates (t/ac ECCE).

  11. Introduce a Lime Reference Strip used with or without an N-rich strip in acid soils to show the benefits of liming Nitrogenstrip Lime Reference Strip

  12. A 60 ft. lime strip was placed in 4 fields in 2007 At about 1 ton ECCE/acre • Two no-till fields near Apache • Two conventional tilled fields near Enid

  13. RI = 1.08 NDVI = 0.50 NDVI = 0.54 pH 5.0 pH 5.0, Limed

  14. RI = 1.11 NDVI = 0.64 NDVI = 0.57 pH 7.0 pH 5.5, Limed pH 5.5, not Limed

  15. RI = 1.04 NDVI = 0.59 NDVI = 0.62 pH 5.2, Limed pH 5.2, not Limed

  16. Using Sensor to Map Wheat Forage Yields

  17. CONCLUSIONS • Soil becomes more acidic with continuous production and N fertilizer application • Active Al increases as soil become more acidic • Grain and forage yields are both impacted by soil acidity • Liming is an effective remediation • Lime reference strip and sensor can demonstrate the benefits of liming

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