Northeast Region Certified Crop Adviser (NRCCA) Study Resources

In This Section

• Introduction
• PO 44 Setting a realistic goal
• PO 45 Determining crop nutrient needs
• PO 46 Environmental effects of nutrient loss
• PO 47 NRCS 590 nutrient management standard
• PO 48 Mass nutrient balance
• PO 49 P-based vs. N-based manure application
• PO 50 Surface application and immediate incorporation of manure
• PO 51 Precision feeding
• PO 52 Environmentally sensitive areas
• PO 53 Nutrient management plans
• PO 54 Calculate total manure production
• PO 55 Capacity factors in manure storage
• PO 56 Three option for P management
• PO 57 The P index
• PO 58 Impacts of practice on P index
• PO 59 Calculate crop P removal
• PO 60 Nitrate leaching index (LI)
• PO 61 Practices to reduce nitrate leaching
• PO 62 Manure odor issues
• PO 63 Agricultural air quality
• PO 64 Reducing pathogen concerns from manure
• Summary

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.