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.
11 pages, via Online journal, The Soil Vulnerability Index (SVI) was developed by the USDA Natural Resources Conservation Service (NRCS) to identify inherent vulnerability of cropland to runoff and leaching. It is a simple index that relies on the SSURGO database and can be used with basic knowledge of ArcGIS. The goal of this study was to investigate a relationship between constituent (sediment and nutrient) loadings and fraction of the watershed in each SVI class. The SVI maps were developed for each of the seven subwatersheds of the Mark Twain Lake watershed in Missouri, which were similar in soil conditions and climatic variability. The SVI assessment was performed by investigating if the distribution of the SVI for cropland in each subwatershed could help explain measured 2006 to 2010 sediment and nutrient loads better than crop distribution alone. Regression analyses were performed between annual loads of sediment and nutrients exported from the watersheds and a composite number that included either cropland distribution alone, or cropland distribution combined with the SVI. Coefficients of determination and p-values were compared to assess the ability of land use and SVI distributions to explain stream loads. Integrating the SVI in the land cover variable improved the ability to explain constituent loads in the watersheds for sediment, total nutrients, and dissolved nitrogen (N). Regression results with and without the SVI were identical for dissolved phosphorus (P), potentially indicating that SVI was not indicative of dissolved P transport at the current site. Overall, the application of the SVI at watershed scale was not perfect, but acceptable at correctly identifying cropland of greatest vulnerability and linking with transported constituent loads.
6 pages., Via online journal., Landscape-scale conservation planning performed in a systematic and transparent manner is becoming more common as it is increasingly evident that ecological processes are being affected at large spatial scales. The Appalachian Landscape Conservation Cooperative undertook a 15-state landscape conservation planning project, resulting in a landscape conservation design called NatureScape. To facilitate NatureScape's implementation by groups and individuals participating in on-the-ground landscape conservation, we developed an online decision support tool. This tool has the potential to assist Extension services in delivering research-based information to varied stakeholders as they make land use decisions.
17 pages., Print ISSN: 0889-048X
Online ISSN: 1572-8366, Via online journal., Almost one-third of all U.S. Americans believe that Jesus Christ will return to Earth in the next 40 years, thereby signaling the end of the world. The prevalence of this end-times theology has meant that sustainability initiatives are often met with indifference, resistance, or even hostility from a significant portion of the American population. One of the ways that the scientific community can respond to this is by making scientific discourse, particularly as related to sustainability, more palatable to end-times believers. In this paper, I apply a historical–ecological framework, which emphasizes the interdisciplinary study of landscapes to understand long-term human–environment interactions, to three millennial religious groups that formed communes in nineteenth century America. The Shakers, Inspirationalists, and Mormons all blended deep beliefs in end-times theology with agricultural practices that were arguably more sustainable than those in use in the mainstream, and their ability to reconcile eschatology with sustainability provides us with potential lessons. By examining the history, doctrines, and agroecology of these nineteenth century communes, I propose communication strategies based in autonomy, institutional support, multigenerational narratives, and anthropocentricism as potential pathways for a more productive dialogue between advocates of sustainability initiatives and end-times believers in the modern United States.
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08786
Notes:
Pages 71-89 in Gordon, Iain J. Prins, Herbert H.T. Squire, Geoff R. (eds.), Food production and nature conservation: conflicts and solutions. United Kingdom: Routledge, London. 348 pages.
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08787
Notes:
Pages 90-112 in Gordon, Iain J. Prins, Herbert H.T. Squire, Geoff R. (eds.), Food production and nature conservation: conflicts and solutions. United Kingdom: Routledge, London. 348 pages.
Kemper, Denise (author) and Weltring, Wiebke (author)
Format:
Proceedings
Publication Date:
2016
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08817
Notes:
Pages 235-259 in Rob Roggema (ed.), Agriculture in an urbanizing society volume one: proceedings of the sixth AESOP conference on sustainable food planning. United Kingdom: Cambridge Scholars Publishing. 549 pages.
