Your search found 4 records
1 Mekuria, Wolde; Noble, Andrew; Sengtaheuanghoung, O.; Hoanh, Chu Thai; Bossio, D.; Sipaseuth, N.; McCartney, Matthew; Langan, Simon. 2014. Organic and clay-based soil amendments increase maize yield, total nutrient uptake, and soil properties in Lao PDR. Agroecology and Sustainable Food Systems, 38:936-961. [doi: https://doi.org/10.1080/21683565.2014.917144]
Soil amendments ; Soil properties ; soil organic matter ; Maize ; Rice husks ; Clay ; Nutrients ; Food security ; Food production ; Agricultural production ; Smallholders ; Bentonite ; Composts ; Biomass ; Land degradation / Lao People's Democratic Republic / Veunkham / Naphok
(Location: IWMI HQ Call no: e-copy only Record No: H046584)
(0.29 MB)
In the Lao People’s Democratic Republic (PDR), increasing food security remains a challenge since smallholder agricultural systems, which are the main source of food production, are under serious threat due to poor soil fertility and climate variability. This study was undertaken in Lao PDR to investigate the impacts of organic and clay-based soil amendments on maize yield, total nutrient uptake, and soil properties. Structured field experiments were established over two consecutive years (2011 and 2012) with maize as the test crop at the Veunkham and Naphok sites. Ten treatments were applied in a randomized complete block design with three replications. The treatments were control, rice husk biochar (applied at a rate of 10 t ha-1), bentonite clay (10 t ha-1), compost (4 t ha-1), clay-manure compost (10 t ha-1), rice husk biochar compost (10 t ha-1), and their combinations. All treatments were applied in 2011. Significant (p < 0.05) treatment effects in maize grain yields, total nutrient uptake, and soil properties were observed. At Veunkham, differences between the control and amended soils in yield ranged from 0.9 to 3.3 t ha-1 in 2011 and from 0.2 to 1.3 t ha-1 in 2012, whereas differences at Naphok varied between 0.2 and 2.2 t ha-1 in 2011 and from 0.2 to 1.7 t ha-1 in 2012. At both sites, in most of the treatments, yields in 2012 were significantly (p < 0.05) lower than 2011; this was attributed to a late season drought. Differences between the control and amended soils in yield can be attributed to the improvements in total N and P uptake, soil pH, exchangeable Ca++ and Mg++, and cation-exchange capacity following the application of soil amendments. The results of this study confirm that the soil amendments under consideration can be effective in improving agricultural productivity, while improving key soil properties indicating that soil amendments could be an option for intensification of agricultural productivity.
2 Soda, W.; Noble, Andrew D.; Suzuki, S.; Simmons, R.; Sindhusen, L.; Bhuthorndharaj, S. 2005. The co-composting of waste bentonites from the processing of vegetable oil and its affect on selected soil properties of a light textured sand. In International Union of Soil Sciences (IUSS); Institut de Recherche pour le Developpement (IRD); Thailand. Land Development Department (LDD); International Water Management Institute (IWMI); FAO. Regional Office for Asia and the Pacific (FAO RAP); Khon Kaen University. Faculty of Agriculture. Management of tropical sandy soils for sustainable agriculture: a holistic approach for sustainable development of problem soils in the tropics. Proceedings of the First Symposium on Management of Tropical Sandy Soils for Sustainable Ariculture, Khon Kaen, Thailand, 27 November – 2 December 2005. Bangkok, Thailand: FAO Regional Office for Asia and the Pacific (FAO RAP). pp.204-214.
Composting ; Bentonite ; Plant oils ; Waste treatment ; Bleaching ; Litter for animals ; Rice husks ; Soil properties ; Soil chemicophysical properties ; Acidity ; Porosity ; Pot experimentation / Thailand / Bangkok
(Location: IWMI HQ Call no: 630 G000 INT Record No: H047327)
(0.59 MB) (16.9 MB)
Waste acid bentonite is a byproduct from vegetable oil bleaching that is both acidic (pH <3.0) and water repellent (hydrophobic). These materials are currently disposed in landfills and are an environmental hazard due to the aforementioned properties. A study was undertaken using three different sources of waste oil bentonites collected from processing plants within the Bangkok metropolitan area. These wastes included soybean oil bentonite (SB), palm oil bentonite (PB) and rice bran oil bentonite (RB), each of which was co-composted with rice husk, rice husk ash, and chicken litter in order to eliminate their acid reactivity and hydrophobic nature. The chemical and physical characteristics of acid activated bentonites before and after bleaching and the co-composted materials after addition to a degraded light textured soil were assessed and are reported herein. The organic carbon (OC) content, pH, exchangeable cations and cation exchange capacity (CEC) of the waste oil bentonites increased significantly after the co-composting phase. In addition, the hydrophobic nature of these materials as measured using the Water Drop Penetration Test (WDPT) decreased from 10,800 seconds to 16-80 seconds after composting. Furthermore, when these composted materials were incorporated into a degraded light textured sandy soil positive impacts to soil physical attributes in terms of specific surface area, total porosity and available water content for crop growth were observed. The results from this study demonstrate the positive impact of the waste products when modified through composting on the physical and chemical properties of a light textured sandy soil.
3 Rao, Krishna C.; Gebrezgabher, Solomie. (Eds.) 2018. Energy recovery from organic waste - Section II. In Otoo, Miriam; Drechsel, Pay (Eds.). Resource recovery from waste: business models for energy, nutrient and water reuse in low- and middle-income countries. Oxon, UK: Routledge - Earthscan. pp.34-313.
Energy recovery ; Energy generation ; Fuels ; Organic wastes ; Resource recovery ; Business management ; Models ; Briquettes ; Agricultural wastes ; Case studies ; Fuelwood ; Charcoal ; Biogas ; Bagasse ; Renewable energy ; Eenergy conservation ; Supply chain ; Socioeconomic environment ; Environmental impact ; Municipal wastes ; Solid wastes ; Public-private cooperation ; Partnerships ; Economic aspects ; Risk reduction ; Faecal sludge ; Food wastes ; Organic fertilizers ; Electrification ; Swine ; Abattoirs ; Industrial wastes ; Carbon credits ; Rice husks ; Rural areas ; Local authorities ; Ethanol ; Sugar industry ; Cassava / Uganda / Rwanda / India / Kenya / Peru / Brazil / Mexico / Thailand / Venezuela / Kampala / Kigali / Nairobi / Bihar / Maharashtra / Pune / Mumias / Dagoretti / Bangkok / Carabobo
(Location: IWMI HQ Call no: IWMI Record No: H048625)
(10.3 MB)
4 Rao, Krishna C.; Natarajan, H.; Doshi, K. 2018. Power from rice husk for rural electrification (Bihar, India) - Case Study. In Otoo, Miriam; Drechsel, Pay (Eds.). Resource recovery from waste: business models for energy, nutrient and water reuse in low- and middle-income countries. Oxon, UK: Routledge - Earthscan. pp.203-214.
Rual areas ; Electrification ; Agricultural waste management ; Rice husks ; Biomass ; Business management ; Supply chain ; Environmental impact / India / Bihar
(Location: IWMI HQ Call no: IWMI Record No: H048642)
(1.07 MB)
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