A Dynamic Socio-hydrological Model of The Irrigation Efficiency Paradox
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Earth and Space Science Open Archive This work has been accepted for publication in Water Resources Research. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]A Dynamic Socio-hydrological Model of The Irrigation Efficiency ParadoxAuthorsAnsirIlyasiDSee all authors Ansir IlyasiDCorresponding Author• Submitting AuthorLahore University of Management SciencesiDhttps://orcid.org/0000-0002-9612-9006view email addressThe email was not providedcopy email addressThe experiment analyses the yield and water use efficiency of maize in different ways of localized irrigations,including the septa-irrigation,septa-spurt-irrigation,film above irrigation and cave irrigation,and the flood irrigation as control.The result had showed: the yield of the film above irrigation was better than the flood mode's,and the septa-irrigation's and septa-spurt-irrigation's were close to flood irrigation's.The yield of the film above irrigation was significant different from flood irrigation's and cave irrigation at 0.01 level,and was different from the septa-irrigation's and septa-spurt-irrigation's at 0.05 level.The water use efficiency by all the localized irrigation treatments was higher than the flood irrigation,and the film above irrigation's was highest.
Surface irrigation
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In this study,an experiment in maize was conducted to determinate the soil water,plant developing dynamic,physiological characteristics and yields in the different water conditions,including the septa-irrigation,septa-spurt-irrigation,film above irrigation and cave irrigation,and the flood irrigation as contrast.The results of the experiment show that definite condition of pre-status of soil moisture,Under the condition of 70% flood irrigation water,among the kinds of Localized Irrigation techniques,the film above irrigation is the best,followed by septa-irrigation,septa-spurt-irrigation and cave irrigation.The yield under film above irrigation is 14.4% higher than that of flood irrigation,The yields of the septa-irrigation and septa-spurt-irrigation were close to flood irrigation The yield under cave irrigation is the lowest of all irrigation ways.
Surface irrigation
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Deficient irrigation is a very significant study, especially with the limited water. Therefore, the current research aims to study the deficit irrigation depending on several different scenarios, by adding different amounts of water and irrigation rates (10%, 30%, 50%, 70%, 90%) of the full irrigation with changing irrigation time and studying its effect on productivity. The results showed that there is a clear effect on the productivity of barley at the level of irrigation (10%-30%) of the full irrigation and for all irrigation dates when changing the date of the first irrigation only, while the results showed when changing the second irrigation only and the first and second irrigation at the level of irrigation (10% - 30% -50%) of the full irrigation, the productivity will decrease by 13.75 - 84.7 kg/ha. It was also noticed that changing the irrigation level for the first irrigation has a very small effect on productivity compared to changing the irrigation level for the second irrigation and for all irrigation dates, and the reason for this is the difference in the stages of yield growth. While the results showed that changing the irrigation level for the first and second irrigation together will have a greater effect on productivity than the rest of the other scenarios.
Surface irrigation
Low-flow irrigation systems
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The field experiments were conducted for consecutive two years to assess the comparative efficiency of sprinkler irrigation over check basin irrigation at different irrigation schedules for groundnut (K-6) during rabi season. Split plot design was adopted for the experiment with two methods of irrigation as main treatments M1 – Sprinkler method and M2 – Check basin irrigation and three irrigation schedules based on IW/CPE ratio at 0.6 (I1), 0.8 (I2) & 1.0 (I3) as sub treatments, replicated thrice. During 2004-05, there was no significant difference in the pod yield obtained between the methods of irrigation, however irrigation scheduled at 1.0 IW/CPE ratio significantly out yielded (1511 kg/ha) the pod yield obtained at 0.8 & 0.6 IW/CPE ratios. The WUE and shelling percent were also not influenced by the irrigation methods and schedules. Significantly higher pod yield was obtained during 2005-06 under sprinkler method of irrigation (2020 kg/ ha) as compared to check basin of irrigation (1762 kg/ha). Irrigation at IW/CPE of 1.0 (I3) resulted in significantly higher pod yield (2123 kg/ha) when compared to I1 and was on par with that of 0.8 IW/CPE ratio (I2). Results indicated that sprinkler method of irrigation scheduled at 1.0 or 0.8 IW/CPE ratios would be beneficial to groundnut crop as compared to check basin method of irrigation.
Surface irrigation
Water Use Efficiency
Irrigation scheduling
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Abstract
Supplementary irrigation for suitable crops production in most area of Iran is necessary. In order to study supplementary irrigation effects on yield and yield components of three Lentil (Lens culinaris Medik.) cultivars, an experiment was carried out as split block based on randomized complete block design with three replications at Research Field, College of Agriculture, Ferdowsi University of Mashhad. In this study, irrigation treatments (including irrigation in all phenological stages; irrigation in branching, flowering, podding and seed setting stage, and without any irrigation in the growing period) as main plot, and three lentil cultivars (Robat, Kalpoosh and Gachsaran) as sub plot were adjusted. Results showed that irrigation had significant effects on number of pods per plant, 100 seed weight, grain and biological yield. Maximum of these traits (except 100 seed weight) after complete irrigation treatment, was obtained at supplementary irrigation in flowering stage. Supplementary irrigation in podding and seed setting stages increased 100 seed weight as compared to irrigation in flowering stage. In without-irrigation treatment, the Gachsaran cultivar produced maximum grain yield. Irrigation in flowering stage increased yield of Robat, Kalpoosh and Gachsaran cultivars more than 60, 60 and 39% relative to the without-irrigation treatment, respectively. Based on the results, supplementary irrigation in flowering stage was more effective in increasing number of pods per plant and lentil yield.
Keywords: Irrigation, Grain yield, Biological yield, Lentil
Split plot
Dry weight
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The field experiments were conducted for consecutive two years to assess the comparative efficiency of sprinkler irrigation over check basin irrigation at different irrigation schedules for groundnut (K-6) during rabi season. Split plot design was adopted for the experiment with two methods of irrigation as main treatments M1 - Sprinkler method and M2 - Check basin irrigation and three irrigation schedules based on IW/CPE ratio at 0.6 (I1), 0.8 (I2) & 1.0 (I3) as sub treatments, replicated thrice. During 2004-05, there was no significant difference in the pod yield obtained between the methods of irrigation, however irrigation scheduled at 1.0 IW/CPE ratio significantly out yielded (1511 kg/ha) the pod yield obtained at 0.8 & 0.6 IW/CPE ratios. The WUE and shelling percent were also not influenced by the irrigation methods and schedules. Significantly higher pod yield was obtained during 2005-06 under sprinkler method of irrigation (2020 kg/ ha) as compared to check basin of irrigation (1762 kg/ha). Irrigation at IW/CPE of 1.0 (I3) resulted in significantly higher pod yield (2123 kg/ha) when compared to I1 and was on par with that of 0.8 IW/CPE ratio (I2). Results indicated that sprinkler method of irrigation scheduled at 1.0 or 0.8 IW/CPE ratios would be beneficial to groundnut crop as compared to check basin method of irrigation.
Surface irrigation
Irrigation scheduling
Water Use Efficiency
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Abstract An investigation, covering 36 irrigation seasons, was made of the effect of a fixed fortnightly roster system on irrigation demands on Mid-Canterbury Irrigation Schemes. Irrigation was applied on a roster day if the deficit equalled or exceeded 1 in. Frequency of irrigation, periods of moisture stress, dates of first irrigation, and month by month distribution of irrigations were determined. Under automatic irrigaton the roster system studied would be practical.
Low-flow irrigation systems
Moisture stress
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A three-year experiment was carried out to investigate the effect of sprinkler irrigation on winter wheat growth in North China Plain. The surface irrigation was arranged as control. The research results indicate that: (1)amplitude of soil moisture during irrigation intervals under sprinkler irrigation condition was lower than that under surface irrigation condition; (2) the maximum number of tillers under sprinkler irrigation condition was smaller than that under surface irrigation condition, however, there was no great difference between the numbers of spikes under both conditions, i.e. the sterile number of tillers under sprinkler irrigation field was smaller than that under surface irrigation condition; (3) winter wheat height under sprinkler irrigation condition was higher than that under surface irrigation condition during elongation stage while there was no significant difference between the two conditions at harvest days; (4) leaf area index(LAI) at earlier stage under sprinkler irrigation condition was smaller or approximates that under surface irrigation condition, the maximum LAI was smaller than that under surface irrigation condition, and LAI gradually increased and became larger than that under surface irrigation condition after perk point; (5) significant difference of biomass of single stem between both irrigation methods was not found before grain filling, and then it increased and became more than that under surface irrigation condition; the total biomass under sprinkle irrigation condition was smaller than that under surface irrigation condition during elongation stage, and then it increased quickly and became higher than that under surface irrigation field; and(6) winter wheat yields under sprinkler irrigation condition were higher than that under surface irrigation condition.
Surface irrigation
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Crop irrigation schedule includes the irrigation times,irrigation quota on each application,irrigation time and irrigation quota,which is determined according to the water requirement in the whole growth period.Based on the analysis of the winter wheat irrigation experiment result in Xiuwen water-saving irrigation demonstration district,the optimal irrigation schedule for winter wheat in Guizhou province is gained.
Irrigation statistics
Irrigation district
Low-flow irrigation systems
Winter wheat
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