Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 174 for “"irrigation water"”.
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A canal irrigation water allocation model.
A water allocation model was developed to assist with allocation of canal water to competing crop irrigation demands. Multi-period linear programming was utilized to optimally allocate water in both time and space to maximize benefits for an irrigated farm. Irrigation scheduling, crop response and …
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The Value of Irrigation Water in New Zealand
… thesis is to examine issues pertaining to freshwater quantity in New Zealand agriculture. Currently, freshwater is managed under the Resource Management Act (1991) and the allocation system is essentially on a “first-come first-served” basis – whoever gains access to water rights first blocks …
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Application of genetic algorithms for irrigation water scheduling
A typical irrigation scheduling problem is one of preparing a schedule to service a group of outlets. These outlets may either be serviced sequentially or simultaneously. This problem has an analogy with the classical earliness/tardiness machine scheduling problems in operations research (OR). In …
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Irrigation Water Pricing: Technology Adoption, Welfare, and Political Economy
… chapter deals with the political economy of water pricing and its implications on the adoption of modern irrigation technology in the presence of asymmetric information and lobbies. The main results are that under the two-part tariff or the nonlinear pricing, farmers have an incentive to …
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Optimal design of municipal and irrigation water distribution systems
In two-dimensional flow, the point of flow separation from the surface coincides with the point at which the skin friction vanishes. However, in three-dimensional flow, the situation is much more complex and the flow separation is rarely associated with the vanishing of the wall shear stress except …
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Control of the irrigation water resources of the Al-Hasa oasis
… is critically dependent on a single over-used water resource. Evidence is presented to show that water usage is inefficient, and that real improvements are possible, but only if the local farmers are provided with the means of determining the soil moisture levels of their fields. Simple …
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Irrigation Water Requirements under Climate Change and Drought Events in Saskatchewan,
… models (GCMs) on irrigated agriculture and water supply in Saskatchewan using 27 different combinations of GCMs, special reports on emissions scenarios (SRES), and time periods (2020s, 2050s, 2080s). Future drought events are extracted from the scenarios using the Standardized …
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Salmonella Internalization From Contaminated Seeds or Irrigation Water in Greenhouse Tomatoes
… had been treated with Salmonella contaminated irrigation water or grown from contaminated seeds. Greenhouse grown tomato plants were placed into eight different groups. Groups one through six consisted of five plants each and were treated with 350 ml of 10^6 Salmonella contaminated irrigation …
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Optimization of irrigation water in South Africa for sustainable and beneficial use
Submitted in fulfilment of the requirements of the Degree of Doctor of Engineering, Durban University of Technology, Durban, South Africa, 2017.
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Efficacy and impact of sanitizers in controlling pathogenic bacteria on irrigation water
Irrigation water quality is crucial for fresh produce. However, the absence of practical microbial water standards and EPA-registered sanitizers poses challenges for growers, impacting food security and increasing the risk of foodborne outbreaks. This study compared the effectiveness of commercial …
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An improved multicriterion analysis approach to avoid subjectivity in irrigation water allocation decisions
The performance of the century-old irrigation system of Pakistan (i.e. warabandi) has been evaluated using socio-economic data gathered by the author in multiple farmers surveys (n=278) conducted in Indus Basin of Pakistan. In the surveyed regions, the warabandi system was performing poorly. …
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Time of application and rate of depletion of sprinkler irrigation water for selected crops
… available moisture percentage is maintained by irrigation at some value between 25 percent and zero. 2 . The amount and distribution of rainfall at Blacksburg, Virginia in 1950 were such that irrigation was not profitable and even detrimental. Decreased yields of corn under irrigation showed …
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An estimation of the economic value of irrigation water for wheat production at sable farms
Water is a finite and vulnerable resource which plays a vital role in economic development.It needs to be managed through demand management (pricing) other than supply management. This study was carried out at Sable farms in Lusaka District of Lusaka Province, Zambia. The main objective of this …
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Evaluation of silver nanoparticle-fortified biochar as a reactive filter media for irrigation water disinfection
… crop contamination pathway is contaminated irrigation water. In an effort to combat the issue of foodborne illnesses, the U.S. Food and Drug Administration introduced new regulations targeting the food production industry, including a stricter law regarding the allowable amount of bacteria …
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A potential energy-saving heat treatment for re-circulated irrigation water and its biological mechanisms
Heat pasteurization is an effective water treatment to address the emerging plant pathogen issue associated with increased water recycling practices in the ornamental horticulture industry. The current protocol that recommends treating water at 95"C for 30 s, however, faces two major challenges: …
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Determination of irrigation water quality of surface and groundwater in Luvuvhu catchment in Limpopo, South Africa
Rapid economic expansion and intensive irrigation activities constitute significant threat to groundwater depletion. This study emphasized on the surface water quality and groundwater quality for irrigation purpose by adopting multivariate statistical methods and the hydrochemical processes and on …
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Selection of Pathogen Surrogates and Fresh Produce Safety: Implications for Public Health and Irrigation Water Quality Policy
… assess lettuce plant contamination by spray irrigation water, and evaluate a common industry quality control (QC) E.coli strain (ATCC 25922). Selections of E.coli surrogates were made utilizing biofilm and leaf attachment data from lab scale assays. Five surrogates were found to be similar in …
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