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Competency Area 6: Nutrient Management and Planning

PO 59. Calculate crop P removal given yield and P concentration.

To determine crop removal, multiply yield (in lb) by the Dry Matter (DM) content times the P content of the DM.

  • For example: 20 tons of silage yield at 35% DM and 0.62% P2O5.
  • Crop P removal = 20 tons x 2000 lb/ton x 0.35 x 0.0062 = 87 lb P2O5 (or 4.35 lb P2O5/ton silage)

The chart below gives P removal estimates of common field crops.