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Micronutrients

Micronutrients. Gordon Johnson, Bill Raun, Hailin Zhang Department of Plant and Soil Sciences Oklahoma State University. The Nutrients: Concentrations in Soils and Plants (continued). Micronutrients. The Nutrients: Likelihood of crop deficiencies and common fertilizer. Micronutrients.

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Micronutrients

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  1. Micronutrients Gordon Johnson, Bill Raun, Hailin Zhang Department of Plant and Soil Sciences Oklahoma State University

  2. The Nutrients: Concentrations in Soils and Plants (continued). Micronutrients

  3. The Nutrients: Likelihood of crop deficiencies and common fertilizer. Micronutrients

  4. Leaf spotting showing Cl deficiency Cl treated

  5. Soil testing for chloride. • Mobile nutrient in soil. • Need 0-24” depth for accurate estimate of soil supply. • Amount required in soil should be related to yield goal.

  6. Soil testing for chloride and sulfate. • Results of 1999 soil test survey of S and Cl. • Over 200 paired surface and subsoil samples. • 17 counties. • Cl = 31 – 429. • S =40 - 735.

  7. Soil testing for chloride and sulfate; average values.

  8. Distribution of chloride in surface and 24” soil layers.

  9. Kansas State University 1998-99 chloride-winter wheat research. • Test site soil Cl levels were 7, 7 and 15 lb/ac 0-24.” • Yields ranged from 60 – 115 bu/acre. • Response ranged from 0 to 15 bu/acre.

  10. Kansas State University 1998-99 chloride-winter wheat research. • Response is variety specific. • Cimarron and Triumph 64 most sensitive. • Custer and Ogallala least responsive. • Most varieties responded when soil test was low (< 20 lb/ac 0-24”).

  11. Wheat response to Chloride at Carrier, OK.

  12. Wheat response to Chloride at Hennessey, OK.

  13. Wheat response to Chloride at Perkins, OK.

  14. Other field observations on Cl. • No wheat response to K addition as KCl for 30 years at Lahoma. • Magruder Plots.

  15. OSU Magruder Plots: Influence of secondary and micronutrient input on crop production. Table 1. Chemical characterization (1992) and wheat grain yield of Magruder Plots. Units of measure: soil test P and K in lb/acre by Mehlich-3; yield in bushels/acre, average for period 1988-1994.

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