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Maximizing Profit Through Variable Rate Phosphorus Fertilization Strategies

This resource from OSU Soil Fertility discusses the impact of variable rate phosphorus (VR-P) fertilization on agricultural profitability. It examines the variability in soil test phosphorus (P) levels and how understanding this variability can lead to better decision-making in fertilization practices. The analysis includes marginal returns of P-fertilizers, highlighting potential profits ranging from $9.60 to $66.77 per acre depending on fertilization strategies and field conditions. Key indicators for VR-P candidacy are also addressed to optimize benefits.

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Maximizing Profit Through Variable Rate Phosphorus Fertilization Strategies

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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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