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Experiences with PSNT in North Carolina

Experiences with PSNT in North Carolina. David H. Hardy Soil Testing Section Agronomic Division- NCDA&CS. NC Broiler Production. Piedmont Research Station (PRS). Union Co. Broiler House Litter. N-29.0 P 2 O 5 -26.8 K 2 O-40.0 lb. of plant available on wet ton basis

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Experiences with PSNT in North Carolina

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  1. Experiences with PSNT in North Carolina David H. Hardy Soil Testing Section Agronomic Division- NCDA&CS

  2. NC Broiler Production Piedmont Research Station (PRS) Union Co.

  3. Broiler House Litter • N-29.0 P2O5-26.8 K2O-40.0 • lb. of plant available on wet ton basis • Broadcast application • > 11,000 samples (1999-2006) • Use rates are 4 – 6 tons per acre, not always yearly • Excellent source of nutrients • Environmental concerns- N and P

  4. General Thoughts on Testing Soils for N • N is very dynamic in our SE soils • Not very predictable • Coastal plains soils • Piedmont soils?? • Time needed for sampling • Busy time of the year with other crops • Quality of samples • Representative of field (12 inch depth)

  5. 2005 PSNT Test • Strip test- history of poultry litter • Four 12-row strips with only 20 GPA of 30% UAN applied at planting • Four 12-row strips with 40 GPA of 30% UAN, split applied • V5 PSNT was 35.5 ppm nitrate-N average • Yield at harvest with weigh wagon • Cornstalk testing- Blackmer (August 30)

  6. 700 to 2000 ppm is optimal, > 2000 is excess.

  7. Brooks Farm- 2006 • Site with history of litter application • Strip test- 4 strip combinations • 30% N at V6 @ 15 GPA vs. no N (NN) • 6 soil samples @ V5 • Tissue samples @ tassel • Yield monitor plus hand-harvest • Cornstalk testing- Blackmer (August 30)

  8. Soil Test Results- Brooks 2006 • W/V 0.96 g cc-1 • CEC- 10.2 meq 100 cc-1 • pH 6.0 • P- 251 mg dm-3 • K- 301 mg dm-3 • 32 ppm NO3-N • Range (22 - 46)

  9. 700 to 2000 ppm is optimal, > 2000 is excess.

  10. Piedmont Research Station- 2006 • Treatment Blocks (subsamples) • Poultry Litter (L) • Poultry Litter + Starter (L+S) • Poultry Litter + Starter + SD (L+S+SD) • 8 soil samples per treatment- PSNT • Leaf N at V5, T, & grain yield

  11. PRS-2006 Results

  12. Piedmont Research Station- 2007 • Site with history of litter • N Rate treatments- 0, 30, 60, 120 • 34-0-0 at V5 • RCBD with 4 reps • 1 soil sample per rep- PSNT • Leaf N at T, & silage + grain yield

  13. PRS Soil Data- 2007

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  17. SUMMARY • Appears to be significant available N where litter is applied on Piedmont soils • On Piedmont soils, PSNT may be of benefit • Lab would be well positioned to handle samples in May

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