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Soil Test P

Soil Test P. STP Variability. $ “Profit” CR (11.2 lb/a). -$5 to +$15). $ “Profit” CR (11.2 lb/a). $ “Profit” VR (0-52 lb/a). -$5 to +$15). -$4 to +$38). STP Variability. $ “Profit” VR - CR. -$2 to +$22). Relative Field Element Size and Soil Test-P.

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Soil Test P

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  1. OSU Soil Fertility 04 01

  2. Soil Test P OSU Soil Fertility 04 01

  3. STP Variability $ “Profit” CR (11.2 lb/a) -$5 to +$15) OSU Soil Fertility 04 01

  4. $ “Profit” CR (11.2 lb/a) $ “Profit” VR (0-52 lb/a) -$5 to +$15) -$4 to +$38) OSU Soil Fertility 04 01

  5. STP Variability $ “Profit” VR - CR -$2 to +$22) OSU Soil Fertility 04 01

  6. OSU Soil Fertility 04 01

  7. Relative Field Element Size and Soil Test-P Marginal Return to P-Fertilizer = $145 (assumes 1 acre cells) VR-CR Marginal Return to P-Fertilizer = $9.60 (6.6 %) OSU Soil Fertility 04 01

  8. VR-CR Marginal Return to P-Fertilizer = $18.80 (13%) VR-CR Marginal Return to P-Fertilizer = $31.2 (21.5%) OSU Soil Fertility 04 01

  9. VR-CR Marginal Return to P-Fertilizer = $45.00 (31%) VR-CR Marginal Return to P-Fertilizer = $49.20 (34%) OSU Soil Fertility 04 01

  10. VR-CR Marginal Return to P-Fertilizer = $66.77 (46%) OSU Soil Fertility 04 01

  11. Influence of Relative Field Element Size on VR-Profit OSU Soil Fertility 04 01

  12. OSU Soil Fertility 04 01

  13. When is a field a candidate for VR P-fertilization? • Composite STP is < 65 (critical level). • Variability is large. • Variability can be reliably measured. • Cost? • Reliable VR P-fertilization is possible. • Cost? OSU Soil Fertility 04 01

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