Northeast Region Certified Crop Adviser (NRCCA) Study Resources

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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 58. Describe the impacts of the following practices on the P index score of a field.

1. Manure application rate
2. Manure application method
3. Manure application timing
4. Manure application relative to streams
5. Soil conservation

A greater application rate increases the P index score, as there is more P that can potentially saturate the soil surface and be lost.  Incorporation of manure reduces the P index score.  Application in summer is less risky (lower score) than in early spring, as the soil is warmer and not as subject to runoff.  Applying manure close to streams carries greater risk (higher score), as there is an increased likelihood that runoff will get into the stream.  Last, reducing erosion through soil conservation practices will reduce the P index score.