Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: C36965
Notes:
Agricultural Publishers Association Records, Series No. 8/3/80, Box 16, 6 pages., APA emphasizes need for gathering current agricultural statistics and reporting them promptly.
12 pages, via Online journal, Corn (Zea mays) grown in the southern Piedmont requires 200 to 280 kg nitrogen (N) ha−1 annually and requires up to 0.87 cm of water per day, making groundwater systems susceptible to nitrate (NO3−) leaching. A perennial white clover (Trifolium repens L.) living mulch (LM) system may reduce NO3-N leaching by using legume N to replace mineral N, though little information is available on such a system in the southern Piedmont. Therefore, a HYDRUS-1D model was used to simulate water and NO3-N flux in three cover crop systems. Cereal rye (Secale cereal L.) (CR), crimson clover (Trifolium incarnatum L.) (CC), and a white clover LM were fertilized with 280, 168, and 56 kg N ha−1. The HYDRUS-1D model was calibrated and validated with observed water contents and NO3-N data that were collected over two years. Water and NO3-N flux models were created for each treatment and evaluated using coefficient of determination, percentage bias, and index of agreement, and showed good agreement to observed data. Nitrate leaching below 1 m in 2015/2016 was 23.5, 12.7, and 21.4 kg ha−1 for the CC, LM, and CR treatments, respectively, but was less than 1 kg ha−1 for all treatments in 2016/2017 due to prolonged drought. Differences in leached NO3-N among treatments were attributed to variation in mineral N application rate and NO3-N uptake by cover crops. Overall, results suggest that the use of a perennial LM system may reduce NO3-N leaching when compared to annual CC and CR cover crop systems.
Axelson J. (author), Battles J. (author), Bulaon B. (author), Cluck D. (author), Cousins S. (author), Cox L. (author), Estes B. (author), Fettig C. (author), Hefty A. (author), Hushinuma S. (author), Hood S. (author), Kocher S. (author), Mortenson L. (author), Koltunov A. (author), Kuskulis E. (author), Poloni A. (author), Ramirez C. (author), Restaino C. (author), Slaton M. (author), Smith S. (author), and Tubbesing C. (author)
Format:
Online journal article
Publication Date:
2019-03-11
Published:
USA: University of California
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 16 Document Number: D10456
10 pages., via online journal, The collaboration helps to coordinate research on the extent and nature of tree mortality and gets the results to forest managers quickly.
