Tuesday, November 6, 2007
194-4

Soil-incorporating Litter Increases Tissue Nitrogen Concentration and Uptake in No-till Cotton.

Haile Tewolde1, Mark Shankle2, Ardeshir Adeli3, Karamat Sistani1, and Dennis Rowe1. (1) USDA-ARS, 810 Hwy. 12 E, Mississippi State, MS 39762, (2) Mississippi State University, 8320 Hwy 15 South, Pontotoc, MS 38863, (3) USDA-ARS Waste Mngmnt & Forage, 810 Hwy 12 East, Mississippi State, MS 39762

Applying poultry litter to fertilize no-till cotton implies the litter is left on the surface without soil-incorporation which exposes the litter and its nutrients to risks of loss in runoff water and volatilization. This research was conducted to test if light soil-incorporation of litter increases the N nutrition of no-till cotton by reducing loss of litter-derived N. The results showed N concentration in leaves, stems, and other aboveground plant parts was greater when the litter was incorporated with the top 50 mm soil layer than when left unincorporated. Soil-incorporating the litter increased the amount of plant-available N probably by conserving litter-derived N from loss to volatilization and runoff. Regardless of the incorporation, cotton fertilized with litter had less tissue N concentration than cotton fertilized with the conventional inorganic fertilizer urea-ammonium nitrate (UAN). Yet, cotton fertilized with litter yielded better than cotton fertilized with the standard UAN.