Your search found 7 records
1 Moustafa, A. T. A.; Tinsley, R.L.. 1984. Influence of soil properties on irrigation management in Egypt. Cairo, Egypt: Egypt Water Use and Management Project. vii, 66p. (EWUP technical report no.64)
Vertisols ; Clay minerals ; Subsurface drainage ; Seepage ; Soil water movement ; Water table ; Sandy soils / Egypt
(Location: IWMI-HQ Call no: 631.7.2 G232 MOU Record No: H0034)
On three of the four distributary canals studied by EWUP, the soils were mostly alluvial clay soil (vertisols) or a vertic subgroup of the entisols. The remaining distributary canal was all sandy Entisols. Vertisols are as oil order composed of heavy, clay soils containing large quantities of clay minerals which expand when wet and contract when dry. Irrigating these soils requires recognizing that the root penetration and measurable soil water changes are restricted to the top 40 cm. This limits the operational available water to 5 to 7 cm. The water infiltration rate during an irrigation can have a hundred fold decline during a 2 hour irrigation, ending with almost sealed conditions. This allows highly uniform application over a large area almost independent of available flow rate. Soil sealing requires a potential for surface drainage to prevent crop suffocation. After an irrigation, redistribution tends to be very slow, with the possibility in winter of it requiring 15 days for a wetting fringe to drain 30 cm. The high infiltration rates in the sandy soils make them basically unsuited for surface irrigation. It is therefore difficult to surface irrigate them efficiently. High water tables occur with large volumes of subsurface water flow. A de facto sub-irrigation system results in which farmers applying water to their field sub-irrigate their neighbors and vise-versa. Some farmers, far from the water source, actually receive more water than their crops required.
2 Tawfic, T. A.; Tinsley, R. L.. 1984. Evaluation of farmers' irrigation practices in El-Hammami sands. Cairo: Egypt Water Use and Management Project. ix, 81p. (EWUP project technical report no.74)
Sandy soils ; On farm research ; Surface irrigation ; Irrigation design ; Irrigation practices ; Furrow irrigation / Egypt
(Location: IWMI-HQ Call no: 631.7.8 G232 TAW Record No: H035)
A study of three of the farms of El-Hammami area in El- Mansuriya region, Giza Governorate, was carried out to evaluate the irrigation of sandy soils. The on-farm irrigation practices in the area indicated that the farmers at the beginning of the canal apply more water than those at the end of the canal. The irrigation application efficiency of the farmers at the tail end of the canal was greater than that of the farmers at the beginning. The data also indicated that subsurface irrigation due to seepage from neighboring fields contributed substantially to crop water use. The study showed that surface irrigation might not be the best way to irrigate these sandy soils.
3 Litwiller, K. E.; Tinsley, R. L.; Deweeb, H. H.; Ley, T. W. 1984. Infiltration studies on Egyptian vertisols. Cairo: Egypt Water Use and Management Project. ix, 66p. (EWUP technical report no.57)
Infiltration ; Soil water ; Water table ; Surface drainage ; Water distribution ; Water management / Egypt
(Location: IWMI-HQ Call no: 631.7.2 G232 LIT Record No: H037)
Twenty-one cylinder infiltration tests were conducted during irrigation of wheat on the shrinking/swelling vertisol soils of Kafr El-Sheikh, Egypt. Infiltration rates decreased rapidly from 720 mm/ hr for the first minute to 7.2 mm/hr at 2 hours elapsed time, with 1/3 of the tests showing soil sealing. In the majority of tests a well-defined two phase cumulative infiltration curve was determined. Significant correlations of antecedent soil moisture content in the 0-100 mm and 0-200 mm soil depth at the phase change, and average infiltration rate during the first phase were found. The first phase of infiltration was considered to represent flow of water through the soil macropores in the drier upper layer and water through the soil macropores. The second phase represented vertical flow into the wetter lower soil layers and filling of the finite storage space above the high water table. The analysis indicated a design application depth for wheat of not less than 120 mm for the first irrigation and 55 mm for subsequent irrigations under prevailing Abu Raya irrigation practices. Good water distribution across the field was facilitated by low long-term infiltration rates and high water table conditions. With the low second phase infiltration rates, water ponded in field depressions for prolonged periods could be detrimental to crops and requires provision for surface drainage. Precision land levelling would reduce this hazard.
4 Al, F. A.; Martella, D. R.; Tinsley, R. L.. 1984. Irrigation practices of EWUP cases Abyuha and Abu Raya sites for 1979-80, 1980-81, 1981-82. Cairo, Egypt: Egypt Water Use and Management Project. vii, 74p. (EWUP project technical paper no.45)
Water use efficiency ; Water management ; Irrigable land ; Water resources ; Farming ; Water delivery ; Canals ; Crops / Egypt
(Location: IWMI-HQ Call no: 631.7.6.2 G232 ALF Record No: H0162)
The purpose of this report is to document the actual irrigation practices of the farmers in two Egypt Water Use and Management Project (EWUP) areas, Abyuha in El-Minya Governorate and Abu Raya in Kafr El-Sheik Governorate. Data on the farmer practices were abstracted from the EWUP R4 Farm Records for the 1979-1980, 1980-1981, and 1981-1982 record years. The study case data were divided into 15 day periods with the winter closure period eliminated from the analysis. A comparison of the actual planting and harvest dates with the expected dates indicated that the actual dates were later than the expected dates by about two weeks. A comparison of the actual number of irrigations with the expected number of irrigations indicated that farmers apply close to the expected number or fewer. The analysis indicated that irrigation gaps for some crops range as high as 89 days. The aggregate demand on the delivery system in both study areas tended to be highest in the periods immediately before and after winter closure and the summer periods, June through September. Comparing the measured water discharged into the Abyha canal with an estimated demand for selected periods indicated that relative fluctuations in the delivery of water correspond fairly well to the demand during the same period. A comparison of the measured water discharge into the Om Sen canal with an estimated demand for selected periods indicated excess delivery of water during the winter periods, periods where shortages of water delivery could have occurred, and a general lack of correspondence of the fluctuations in discharge to the fluctuations in demand.
5 Abdel, A. F.; Tinsley, R. L.. 1984. Use of farm records for irrigation planning in Egypt. In M. J. Blackie (Ed.), African Regional Symposium on Small Holder Irrigation, 5-7 September 1984 (pp. 339-351). London, UK: Hydraulics Research Ltd.
(Location: IWMI-HQ Call no: 631.7.3 G100 BLA Record No: H01593)
6 Haider, M. I.; Sheng, T. S.; Tinsley, R. L.; Mohammed, R. A.; Warner, J. W.; Clyma, W.; Nayman, O. B. 1987. Pre-rehabilitation diagnostic study of Sehra Irrigation System, Sind Pakistan. Fort Collins, CO, USA: Colorado State University. iv, 40p. (WMS report 53)
Rehabilitation ; Water distribution ; Water requirements ; Investment ; Resource management ; Crop production ; Constraints / Pakistan
(Location: IWMI-HQ Call no: 631.7.8 G730 HAI Record No: H04017)
7 Tinsley, R. L.. 2004. Developing smallholder agriculture: a global perspective. Brussels, Belgium: AgBe Publishing. 437p.
Smallholders ; Economic aspects ; Social aspects ; Farmers ; Public policy ; Farming systems ; Land management ; Land tenure ; Rain ; Labour ; Governance ; Public participation ; Private sector ; Farmers organizations ; Technology transfer ; Sustainable agriculture ; Nutrient management ; Pesticides ; Irrigation schemes ; Irrigation systems ; Water user associations ; Animal husbandry
(Location: IWMI-HQ Call no: 631.72 G000 TIN Record No: H043510)
Powered by DB/Text WebPublisher, from
