9pgs, Soil loss due to crop harvest contributes to land degradation, and knowledge of this challenge can guide the choice of crops for sustainable agriculture. Nigeria is the largest producer of cassava (Manihot esculenta Crantz) and the third largest producer of peanut (Arachis hypogaea Linn) in the world. Due to limited information on soil loss during peanut and cassava harvests worldwide, and cost of nutrient loss, a two-year field experiment was conducted to compare soil loss due to harvesting of peanut and cassava and to estimate cost of nutrient loss due to crop harvest under traditional agriculture. Peanut pod yields of 2.39 and 2.08 t ha–1harvest–1 removed 0.62 and 0.58 t ha–1 harvest–1 during peanut harvest, respectively, for years 1 and 2. Similarly, cassava yields of 22.71 and 21.40 t ha–1 harvest–1 removed 1.11 and 0.91 t ha–1harvest–1 during cassava harvest, respectively, for years 1 and 2. Crop yields strongly correlated with soil loss due to peanut harvest (R2= 0.36; p < 0.001) and soil loss due to cassava harvest (R2 = 0.23; p < 0.01). Significantly higher soil loss due to cassava harvest compared to peanut harvest can be ascribed to higher cassava yield. Also, soil nutrient loss due to crop harvest was significantly (p < 0.001) higher for cassava compared with peanut by 27.6% phosphorus (P) and 73.7% potassium (K) for the first year and 39.2% P and 79.1% K for the second year. Fertilizer equivalent cost of P and K losses due to cassava harvest for the two years was higher than that of peanut by US$29 ha–1. The study indicated that the intensity of nutrient loss by harvesting is largely dependent on the crop type, and harvesting of cassava can deplete soil nutrients faster than that of peanut under traditional agriculture. Sequential planting of cassava (deep rooted crop) followed by peanut (shallow rooted crop) as a crop rotation management practice is recommended to mitigate soil loss due to continuous harvesting of cassava, and harvesting with thorough shaking technique is also suggested to reduce nutrient loss potential of crop harvesting.
6 pages, via Online journal, Most agricultural soils are depleted of their soil organic matter (SOM) reserves. A severe loss of SOM content may degrade soil functionality, its capacity for provisioning of essential ecosystem services, and soil health. Therefore, restoration of SOM content in soils of agroecosystems may reverse the degradation trends, enhance ecosystem services (Banwart et al. 2015), and advance Sustainable Development Goals of the United Nations. (Lal et al. 2018a). Increase in SOM content may also partially replace the use of chemical fertilizers and supplemental irrigation, while restoring the environment.
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.
10 pages., via online journal., Peri-urban environments, where agriculture and urbanization interact, pose unique challenges for soil management. In Miami-Dade County, Florida USA, this interaction is especially important; a population of 2.7 million lives in an urban county with only 6% of the area zoned agriculture. Miami-Dade County is a major producer of tropical fruit and winter vegetables for the U.S., and is located within the Everglades ecosystem. Relatively little information is known about research and extension within peri-urban environments concerning soil health and management. Ethnopedological work has contributed to ethno-scientific knowledge by bridging the communication gap between scientists and locals concerning soil taxonomies, soil health, and soil fertility management. This study explores mental models of farmers and experts, examining the communication gap concerning soil health and food security. Semi-structured interviews were used to collect data from farmers (n = 19) and experts (n = 13). All stakeholders perceived pressures from urbanization as the main barrier to farmers' ability to continue to produce food, maintain their soil health, and contribute to national food security. The mental models of farmers reveal their ability to continue farming depends on their ability to construct and sustain a system—the soil food value chain. In this system, the farmer generates farm capital from a combination of high quality products, lower quality produce, and culls. This farm capital includes value-added products or soil amendments. However, experts did not perceive their responsibility to include maintaining a system, rather, only improving production. Experts' research and extension focused on improving product quality, increasing yield, decreasing cost of production, and minimizing the environmental impact of production. The mental models of farmers suggest research and extension related to building and maintaining the entire soil food value chain would increase the likelihood the farmers would better care for their soil and be profitable. This research contributes to the literature by recognizing the importance of examining the barriers to soil communication between stakeholders, as well as the importance to include examining soil within the larger food system.
Critchley, Will (author), Lameck, Patrick (author), Lwakuba, Alex (author), Mburu, Charles (author), and Miiro,Dan (author)
Format:
Book chapter
Publication Date:
2001
Published:
International
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D01203
Notes:
Pages 178-184 in Chris Reij and Ann Waters-Bayer (eds.), Farmer innovation in Africa: a source of inspiration for agricultural development. Earthscan Publications, Ltd., London, England. 362 pages.
