Hailu, Berhane (author) and Haile, Mitiku (author)
Format:
Book chapter
Publication Date:
2001
Published:
Ethiopia
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D01212
Notes:
Pages 310-324 in Waters-Bayer (eds.), Farmer innovation in Africa: a source of inspiration for agricultural development. Earthscan Publications, Ltd., London, England. 362 pages.
Murwira, Kudakwashe (author), Hagmann, Jurgen (author), and Chuma, Edward (author)
Format:
Book chapter
Publication Date:
2001
Published:
Zimbabwe
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D01211
Notes:
Pages 300-309 in Waters-Bayer (eds.), Farmer innovation in Africa: a source of inspiration for agricultural development. Earthscan Publications, Ltd., London, England. 362 pages.
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.
Shikuku, Kelvin M. (author), Winowiecki, Leigh (author), Twyman, Jennifer (author), Eitzinger, Anton (author), Perez, Juan G. (author), Mwongera, Caroline (author), and Läderach, Peter (author)
Format:
Journal article
Publication Date:
2017-03-08
Published:
Africa
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 169 Document Number: D08757
3 pages, via online journal, The fast-moving coronavirus disease 2019 (COVID-19) pandemic engulfed the world within four months from December to March of 2020, with long-lasting impacts on social, economic, political, educational, and scientific programs. It exacerbated risks of food and nutritional insecurity for a large segment of society, and threats of disruption in the food supply chain may be aggravated by climate change, soil degradation, and the flood/drought syndrome. Ensuring adequate access to nutritious food is a daunting challenge even in developed/scientifically advanced countries, and is a sheer tragedy in poor nations.
