Technical ArticlePoultry Litter Time and Method of Application Effects on Corn YieldJn-Baptiste, Marcia1; Sistani, Karamat R.1; Tewolde, Haile2Author Information 1United States Department of Agriculture–Agricultural Research Service, 230 Bennett Lane, Bowling Green, Kentucky, USA. 2United States Department of Agriculture–Agricultural Research Service, Mississippi State, Mississippi, USA. Address for correspondence: Dr. Marcia Jn-Baptiste, P.O. Box 50874, Bowling Green, KY 42102, USA. E-mail: [email protected] Financial Disclosures/Conflicts of Interest: The authors report no conflicts of interest. Received September 30, 2012. Accepted for publication February 26, 2013. Soil Science: March 2013 - Volume 178 - Issue 3 - p 109-119 doi: 10.1097/SS.0b013e31828f5fa0 Buy Metrics Abstract Adopting efficient management practices for using poultry litter (PL) as an alternative to commercial fertilizer is critical for increased N use efficiency. This 3-year study investigated effects of application time (fall and spring) and method of application (soil incorporation and nonincorporation) of three PL rates and NH4NO3 (146 kg N ha−1) on availability of selected soil nutrients and corn (Zea mays L.) grain yield in northern Alabama. The plant-available N rates supplied by the PL were 68 kg N ha−1 (low), 135 kg N ha−1 (medium), and 270 kg N ha−1 (high). Soil inorganic N, Mehlich-3–extractable P, and available K were measured before planting in April, mid-season in June or July, and postharvest in October or November. Averaged across the 3 years, grain yield from the high PL rate was similar to that of the medium PL rate when spring applied. The medium PL rate resulted in 800 kg ha−1 greater grain yield than NH4NO3 from both spring and fall applications. Incorporation of the medium PL rate increased grain yield 590 kg ha−1 and NH4NO3 by 480 kg ha−1, respectively, than nonincorporation but no yield advantage of incorporating the low and high PL rates. Inorganic N, Mehlich-3–extractable P, and available K were highest from mid-season sampling and from spring than fall applications. When N sources were incorporated, the medium PL rate resulted in greater N and P uptake. Results from this study suggest that fall application of NH4NO3 and PL beyond the medium rate should not be encouraged for warm climatic conditions. © 2013 Lippincott Williams & Wilkins, Inc.