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Experiences with PSNT in North Carolina David H. Hardy Soil Testing Section Agronomic Division- 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. NC Broiler Production Piedmont Research Station (PRS) Union Co.

Broiler House Litter • N-29. 0 P 2 O 5 -26. 8 K 2 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 • 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

General Thoughts on Testing Soils for N • N is very dynamic in our 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)

2005 PSNT Test • Strip test- history of poultry litter – Four 12 -row 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 • V 5 PSNT was 35. 5 ppm nitrate-N average • Yield at harvest with weigh wagon • Cornstalk testing- Blackmer (August 30)

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

Brooks Farm- 2006 • Site with history of litter application • Strip test- 4 Brooks Farm- 2006 • Site with history of litter application • Strip test- 4 strip combinations – 30% N at V 6 @ 15 GPA vs. no N (NN) • • 6 soil samples @ V 5 Tissue samples @ tassel Yield monitor plus hand-harvest Cornstalk testing- Blackmer (August 30)

Soil Test Results- Brooks 2006 • • • W/V 0. 96 g cc-1 CEC- Soil Test Results- Brooks 2006 • • • W/V 0. 96 g cc-1 CEC- 10. 2 meq 100 cc-1 p. H 6. 0 P- 251 mg dm-3 K- 301 mg dm-3 32 ppm NO 3 -N – Range (22 - 46)

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

Piedmont Research Station- 2006 • Treatment Blocks (subsamples) – Poultry Litter (L) – Poultry 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 V 5, T, & grain yield

PRS-2006 Results Treatment Soil-NO 3 N- V 5 ppm % N-T % Yield bu PRS-2006 Results Treatment Soil-NO 3 N- V 5 ppm % N-T % Yield bu ac-1 Stalk NO 3 ppm Litter (L) 39 4. 63 2. 20 124 4060 L + Starter (S) 44 4. 63 2. 12 142. 7 3986 L + SD 46 4. 91 2. 38 148. 5 3229

Piedmont Research Station- 2007 • Site with history of litter • N Rate treatments- Piedmont Research Station- 2007 • Site with history of litter • N Rate treatments- 0, 30, 60, 120 – 34 -0 -0 at V 5 • RCBD with 4 reps • 1 soil sample per rep- PSNT • Leaf N at T, & silage + grain yield

PRS Soil Data- 2007 Rep HM % WV CEC p. H g cc-1 meq PRS Soil Data- 2007 Rep HM % WV CEC p. H g cc-1 meq 100 cc-1 P K NO 3 ------mg dm-3 ------ 1 0. 2 1. 12 15. 3 6. 6 168 291 43 2 0. 2 1. 13 17. 1 7. 0 257 293 53 3 0. 3 1. 17 15. 3 7. 0 229 274 40 4 0. 3 1. 14 15. 7 6. 9 232 190 36

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SUMMARY • Appears to be significant available N where litter is applied on Piedmont 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