Your search found 8 records
1 Ritsema, C. J.; Stolte, J.; van den Elsen, E. G. M.; Rui, L.; Liu, B.; Fu, B.; Liding, C.; Jetten, V.; Hessel, R.; Ledin, S.; Messing, I.; Fagerström, M. 2003. Reducing sediment loads to the Yellow River: options and challenges from land use and soil and water conservation perspective. In Yellow River Conservancy Commission. Proceedings, 1st International Yellow River Forum on River Basin Management – Volume II. Zhengzhou, China: The Yellow River Conservancy Publishing House. pp.343-350.
River basin development ; Sedimentation ; Erosion ; Models ; Water conservation ; Soil conservation ; Participatory management / China / Yellow River / Loess Plateau
(Location: IWMI-HQ Call no: 333.91 G592 YEL Record No: H033866)
2 Mai, V. T.; Van Keulen, H.; Hessel, R.; Ritsema, C.; Roetter, R. P.; Thai, P. 2007. Soil erosion in Quan Dinh watershed, a hilly area in Tam Duong district, north Vietnam. In Mai, V. T. Soil erosion and nitrogen leaching in northern Vietnam: Experimentation and modelling. Thesis. Wageningen, Netherlands: Wageningen University. pp.17-33.
Erosion ; Measurement ; Watersheds ; Sedimentation ; Paddy fields ; Terraces ; Runoff ; Soils ; Land use / Vietnam / Tam Duong District / Red River Delta / Quan Dinh Watershed
(Location: IWMI HQ Call no: D 631.45 G784 VAN Record No: H039971)
(3.22 MB)
3 Mai, V. T.; Hessel, R.; Van Keulen, H.; Ritsema, C.; Roetter, R. P. 2007. Simulation of soil erosion in Quan Dinh watershed in Tam Duong district, north Vietnam. In Mai, V. T. Soil erosion and nitrogen leaching in northern Vietnam: Experimentation and modelling. Thesis. Wageningen, Netherlands: Wageningen University. pp.35-60.
Erosion ; Simulation models ; Watersheds ; Paddy fields ; Terraces ; Infiltration ; Runoff ; Sedimentation / Vietnam / Tam Duong District / Quan Dinh watershed
(Location: IWMI HQ Call no: D 631.45 G784 VAN Record No: H039972)
(3.22 MB)
4 Mai, V. T.; Van Keulen, H.; Hoanh, Chu Thai; Hessel, R.; Roetter, R. P. 2007. Spatial dynamics of nitrogen in shallow groundwater under intensive farming in northern Vietnam. In Mai, V. T. Soil erosion and nitrogen leaching in northern Vietnam: experimentation and modelling. Thesis. Wageningen, Netherlands: Wageningen University. pp.119-135.
Groundwater ; Nitrogen fertilizers ; Leaching ; Simulation models ; Calibration ; Water pollution ; Vegetables ; Percolation ; GIS / Vietnam / Tam Duong District
(Location: IWMI HQ Call no: D 631.45 G784 VAN Record No: H039976)
(3.22 MB)
5 Mai, V. T.; Van Keulen, H.; Hoanh, Chu Thai; Hessel, R.. 2008. Spatial simulation of nitrogen leaching from intensive agriculture in northern Vietnam. In Proceedings of International Symposium on GeoInformatics for Spatial-Infrastructure Development in Earth and Allied Sciences (GIS-IDEAS), Hanoi, Vietnam, 4-6 December 2008. Wageningen, Netherlands: Wageningen UR Publication. pp.383-388.
Simulation models ; Calibration ; Nitrogen fertilizers ; Leaching ; Irrigated farming ; Groundwater ; Percolation ; Intensive farming ; Spatial distribution ; Vegetables ; Cabbages / Vietnam / Tam Duong District
(Location: IWMI HQ Call no: e-copy only Record No: H041856)
http://wgrass.media.osaka-cu.ac.jp/gisideas08/viewpaper.php?id=288
https://vlibrary.iwmi.org/pdf/H041856.pdf
https://vlibrary.iwmi.org/pdf/H041856.pdf
(0.21 MB)
6 Mai, V. T.; Hoanh, Chu Thai; Van Keulen, H.; Hessel, R.. 2013. Spatial modelling for nitrogen leaching from intensive farming in Red River Delta of Vietnam. Asian Journal of Water, Environment and Pollution, 10(3):51-61.
Intensive farming ; Nitrogen ; Leaching ; Rivers ; Deltas ; Irrigation ; Land use ; Soil water content ; Vegetables ; Crop production ; Fertilizers ; Weather ; Models ; Calibration / Vietnam / Tam Duong District / Red River Delta
(Location: IWMI HQ Call no: e-copy only Record No: H046039)
(1.12 MB)
In this study, a spatial dynamic model was developed, to simulate nitrogen dynamics in Van Hoi commune, Tam Duong district, Vietnam, for different soil and land use types, under different irrigation and fertilizer regimes. The model has been calibrated using measured nitrogen concentrations in soil solution in March and August 2004 and validated for data from March and August 2005. Lateral flow was low in this level area. Percolation was the main process leading to high nitrogen leaching losses to ground water. Calculated annual leaching losses varied from 88 to 122 kg N ha–1 in flowers, 64 to 82 in vegetables of the cabbage group, 51 to 76 in chili, 56 to 75 in vegetables of the squash group, and 36 to 55 in rice.
7 Grum, B; Hessel, R.; Kessler, A.; Woldearegay, K.; Yazew, E.; Ritsema, C.; Geissen, V. 2016. A decision support approach for the selection and implementation of water harvesting techniques in arid and semi-arid regions. Agricultural Water Management, 173:35-47. [doi: https://doi.org/10.1016/j.agwat.2016.04.018]
Water harvesting ; Techniques ; Indicators ; Decision support systems ; Arid zones ; Semiarid zones ; Watersheds ; Socioeconomic environment ; Ecological factors ; Biophysics ; Cultivated land ; Soils ; Rain ; GIS ; Mapping ; Stakeholders ; Case studies / Ethiopia / Upper Geba Watershed
(Location: IWMI HQ Call no: e-copy only Record No: H047605)
(3.70 MB)
Water harvesting techniques (WHTs) improve the availability of water, which is essential for growing crops, especially in arid and semi-arid areas. A decision support approach can help in the selection of WHTs suitable under site-specific bio-physical and socio-economic conditions. This paper describes a participatory approach for the selection of suitable WHTs in watersheds in (semi) arid regions. It builds on a database of suitability indicators for WHTs, which was developed by integrating worldwide knowledge on their suitability. Once developed, the approach was applied on a case study for WHTs in the upper Geba watershed in northern Ethiopia. First, based on evaluation criteria and participants’ scientific and local knowledge, a pre-selection of most promising WHTs took place in a multi-stakeholder workshop. Next, the suitability indicators and a GIS-based multi-criteria analysis (MCA) were used to identify suitable areas for these WHTs. The results of the MCA were presented to stakeholders during a second stakeholder workshop. At this workshop, a final selection of WHTs to test was made based on a participatory ranking of WHTs using economic, ecological and socio-cultural criteria. The MCA approach was validated by comparing the predicted suitable areas with the already existing WHTs in the watershed. This led to the result that 90% of the existing check dams and 93% of the percolation ponds were correctly identified by the approach. We conclude therefore that this approach can be successfully applied for the participatory selection of WHTs and the identification of suitable areas for their implementation. Given that this approach is based on the newly developed database of WHTs, it can be easily applied in other (semi) arid regions.
8 Grum, B.; Assefa, D.; Hessel, R.; Woldearegay, K.; Ritsema, C. J.; Aregawi, B.; Geissen, V. 2017. Improving on-site water availability by combining in-situ water harvesting techniques in semi-arid northern Ethiopia. Agricultural Water Management, 193:153-162. [doi: https://doi.org/10.1016/j.agwat.2017.08.009]
Water availability ; Water harvesting ; Techniques ; Straw mulches ; Ridge tillage ; Soil moisture ; Runoff ; Soil hydraulic properties ; Rain ; Hydrometeorology ; Watersheds ; Semiarid zones / Ethiopia / Gule Sub-Watershed
(Location: IWMI HQ Call no: e-copy only Record No: H048375)
(2.78 MB)
Crop production in arid and semi-arid environments is strongly affected by temporal variation of water availability during the growth period. In-situ water harvesting techniques such as tied ridges and mulching improve water availability over time and may improve crop yield. A field experiment was conducted in 2013 and 2014 in the Gule sub-watershed, Northern Ethiopia to study the effect of combining in-situ water harvesting techniques on on-site water regime, i.e., runoff and soil-moisture content. Five treatments with tied ridges, straw mulch, tied ridges and straw mulch together, straw mulch plus effective microorganisms and a combination of tied ridges, straw mulch and effective microorganisms and an untreated control were tested. Combined tied ridges and straw mulch with and without effective microorganisms significantly reduced average runoff per event by 78 and 88%, respectively, compared to the control. Tied ridges alone reduced runoff by 56% and straw mulch with and without effective microorganisms reduced runoff by 49 and 53%, respectively. Average soil-moisture content over the two years was significantly higher (22.4%) in combined tied ridges and straw mulch than the control (19.9%). Tied ridges or straw mulch alone significantly reduced runoff and improved soil-moisture content, but the two combined were more efficient. The findings suggest that combining straw mulch and tied ridges enhance water infiltration into the soil and improve water availability during the growing season, thereby protecting crops from dry periods.
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