scholarly journals Modeling Moisture Redistribution of Pulse Drip Irrigation Systems by Soil and System Parameters: New Regression-based Approaches

2021 ◽  
Author(s):  
Bakhtiar Karimi ◽  
Nazir Karimi ◽  
Jalal Shiri ◽  
Hadi Sanikhani
Keyword(s):  
Drip Irrigation ◽  
Regression Models ◽  
Linear Regression Models ◽  
Irrigation Systems ◽  
System Parameters ◽  
Different Types ◽  
Use Efficiency ◽  
Wetted Area ◽  
Light Medium ◽  
Moisture Redistribution

Abstract One of the strategies for increasing water use efficiency and reducing deep percolation drip irrigation systems is considering the patterns of moisture redistribution after cut-offing the irrigation process. An experimental study was conducted in the present research to evaluate the moisture redistribution process under surface and subsurface pulse drip irrigation systems and developing new regression-based methodologies for estimating moisture redistribution dimensions using both the soil and system parameters together. A physical model was made and the experiments were performed on three different types of soil texture (light, medium, and heavy) with three emitter flow rates (2, 4, and 6 lit/hr) in three emitter installation depths (0, 15, and 30 cm). The experiments were conducted for both continuous (CI) and pulse (PI) irrigation modes. The results showed that significant amounts of wetting dimensions and wetted area of the moisture bulb are related to post-cut-offing stage. Then, using the nonlinear regression analysis, several models were proposed to estimate the horizontal and vertical redistribution pattern as well as the wetted area (upper and lower parts of the emitter). The comparison of the measured and the stimulated values indicated that the non-linear regression models simulated the parameters associated with redistribution, accurately.

scholarly journals Environmental and Economic Sustainability Assessment for Two Different Sprinkler and A Drip Irrigation Systems: A Case Study on Maize Cropping

Agriculture ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 187 ◽  
Author(s):  
Eros Borsato ◽  
Marco Martello ◽  
Francesco Marinello ◽  
Lucia Bortolini
Keyword(s):  
Growth Rate ◽  
Water Use Efficiency ◽  
Water Use ◽  
Drip Irrigation ◽  
Water Footprint ◽  
Irrigation Systems ◽  
Environmental Aspect ◽  
Irrigation Practice ◽  
Center Pivot ◽  
Use Efficiency

Water scarcity is worsened by climate change. Water savings can be reached by improving irrigation efficiency both on farm and on water supply. To do that, the choice of the best irrigation technology is not always straightforward, because farmers need to renew and implement farm infrastructures for irrigation. This study compares three irrigation systems, one drip irrigation and two sprinkler (center pivot and hose-reel) systems, on environmental, economic, and energetic performance under irrigated and non-irrigated maize cropping. The study combines impact and efficiency indicators, addressing a sustainability analysis for the irrigation practice under the three different irrigation systems. The sustainability for the irrigation systems was assessed using water-related indicators (water use efficiency, irrigation water use efficiency, and water footprint), biomass (crop growth rate, relative growth rate, harvest index, and yield response factor), and energy indicators (energy footprint, performance, and energy cost footprint) for the environmental aspect; and the economic-based indicators (water productivity and economic water footprint) for the economic aspect. Main results address the center pivot system as the best solution for irrigation practice since it demonstrated higher economic and environmental performance. Moreover, maize under the pivot system allowed a higher biomass production, economic benefits, and water use efficiency.

scholarly journals Productivity of Onions Using Subsurface Drip Irrigation versus Furrow Irrigation Systems with an Internet Based Irrigation Scheduling Program

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Juan Enciso ◽  
John Jifon ◽  
Juan Anciso ◽  
Luis Ribera
Keyword(s):  
Drip Irrigation ◽  
Irrigation Scheduling ◽  
Furrow Irrigation ◽  
Subsurface Drip Irrigation ◽  
Irrigation Systems ◽  
Use Efficiency ◽  
Subsurface Drip ◽  
Selection Of ◽  
Commercial Field ◽  
Plot Design

Selection of the proper irrigation method will be advantageous to manage limited water supplies and increase crop profitability. The overall objective of this study was to evaluate the effect of subsurface drip irrigation (SDI) and furrow irrigation on onion yield and irrigation use efficiency. This study was conducted in two locations, a commercial field and a field located at the Texas A&M AgriLife Research Center in Weslaco, TX. This study was conducted as a split-plot design for both sites with two treatments (SDI and furrow irrigation) and three replications per treatment. The total onion yield obtained with the SDI systems was more than 93% higher than the yield obtained with furrow irrigation systems. The large onion size was 181% higher for the SDI system than the furrow system in both sites. The colossal size yield was also higher. At one site colossal yield was 206% higher than furrow, while at another site furrow yielded no colossal onions and SDI had some production. It was concluded that drip irrigation systems more than double yields and increased onion size while using almost half of the water. This was due to SDI allowing for more frequent and smaller irrigation depths with higher irrigation efficiency than furrow irrigation systems.

Integrative analysis with a system of semiparametric projection non-linear regression models

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ao Yuan ◽  
Tianmin Wu ◽  
Hong-Bin Fang ◽  
Ming T. Tan
Keyword(s):  
Linear Regression ◽  
Regression Models ◽  
Integrative Analysis ◽  
The Cancer Genome Atlas ◽  
Control Group ◽  
Linear Regression Models ◽  
Coordinate Structure ◽  
Different Types ◽  
Non Linear ◽  
Cancer Genome Atlas

AbstractIn integrative analysis parametric or nonparametric methods are often used. The former is easier for interpretation but not robust, while the latter is robust but not easy to interpret the relationships among the different types of variables. To combine the advantages of both methods and for flexibility, here a system of semiparametric projection non-linear regression models is proposed for the integrative analysis, to model the innate coordinate structure of these different types of data, and a diagnostic tool is constructed to classify new subjects to the case or control group. Simulation studies are conducted to evaluate the performance of the proposed method, and shows promising results. Then the method is applied to analyze a real omics data from The Cancer Genome Atlas study, compared the results with those from the similarity network fusion, another integrative analysis method, and results from our method are more reasonable.

scholarly journals Outdoor Public Recreation Spaces And Social Connectedness Among Adolescents

2021 ◽  
Author(s):  
Elise Rivera ◽  
Jenny Veitch ◽  
Venurs HY Loh ◽  
Jo Salmon ◽  
Ester Cerin ◽  
...  
Keyword(s):  
Physical Activity ◽  
Regression Models ◽  
Social Connectedness ◽  
Public Spaces ◽  
Future Research ◽  
Sports Facilities ◽  
Linear Regression Models ◽  
Different Types ◽  
Public Recreation ◽  
Multilevel Linear Regression

Abstract Background: Outdoor public recreation spaces are important settings for leisure and physical activity. Adolescents’ use of these spaces may be related to their social connectedness; however, research on this topic is limited. This study examined associations of frequency of visitation and physical activity in outdoor public recreation spaces with social connectedness among adolescents in Melbourne, Australia. Methods: Adolescents self-reported their frequency of visitation to parks, trails, beach/lake, and sports facilities; frequency of physical activity in a park, local street or path, and their street; and social connectedness. Separate analyses were conducted for visitation (n=349, 15.4±1.6 years, 58% female) and physical activity (n=441, 15.4±1.6 years, 59% female) using multilevel linear regression models. Results: No significant associations were observed for frequency of visitation to a park (B = 0.86, 95% CI= -0.26, 1.99), trails (B = 0.41, 95% CI= -0.61, 1.44), beach/lake (B = -0.44, 95% CI= -1.46, 0.57), or sports facilities (B =0.64, 95% CI= -0.43, 1.70), nor for frequency of physical activity in their street (B = -0.07, 95% CI= -0.46, 0.31), local streets/paths (B = -0.05, 95% CI= -0.43, 0.33) or in parks (B = 0.23, 95% CI= -0.14, 0.60) with adolescents’ social connectedness. Conclusions: The findings did not support the hypothesis that visiting and being active in outdoor public recreation spaces are associated with adolescents’ social connectedness. Future research should consider the duration and context of outdoor public recreation space use (e.g., sports, socialising, relaxing alone) and whether different types and/or a combination of public spaces are more/less conducive to social connectedness.

scholarly journals Effects of Alternate Irrigation with Saline and Non-Saline Water on Sorghum Crop Manured with Elaeagnus angustifolia Leaves Using 15N

2017 ◽  
Vol 11 (1) ◽  
pp. 24-34 ◽  
Author(s):  
Farid Al-Ain ◽  
Mohamad Al-Chamma'a ◽  
Fawaz Kurdali
Keyword(s):  
Nitrogen Uptake ◽  
Nitrogen Use Efficiency ◽  
Green Manure ◽  
Saline Water ◽  
Agricultural Practice ◽  
Elaeagnus Angustifolia ◽  
Irrigation Systems ◽  
Nitrogen Use ◽  
Different Types ◽  
Use Efficiency

Background:A pot experiment was conducted to determine the effects of alternate irrigation with saline (S) and fresh (F) water on growth, nitrogen uptake and nitrogen use efficiency in Sorghum crop (Sorghum bicolorL.) manured withElaeagnus angustifolialeaves (GM) using15N.Method:Five types of irrigation systems abbreviated as (F, 2F:1S, 1F:1S, 1F:2S and S) and one rate of Green Manure (GM) were employed.Result:Results showed reductions in both Dry Matter yield (DM) and nitrogen uptake (NY) in sorghum grown under different types of irrigation systems as compared with the control (F). The reduction rates of these two parameters increased with increasing number of irrigations with saline water. However,E. angustifolialeaves applied as green manure mitigated the harmful effect of salinity on plant growth parameters. The percent increments as a result of GM application were 9, 19, 43, 43 and 65% for DM, and 33, 30, 42, 36 and 60% for NY in F, 2F:1S, 1F:1S, 1F:2S and S, respectively. Nitrogen use efficiency of added green manure ranged between 25 and 47% in the different types of irrigation systems. Our results indicated that increment of NY in green manured sorghum plants was mainly attributed to its nitrogen availability. According to the availability of S and F water resources, and the economic returns aimed by farmers in the semi-arid regions, it is recommended to use (2F:1S, 1F:1S and 1F:2S) in combination withE. angustifolialeaf GM. Such a procedure can be considered as a promising agricultural practice to improve yield with a proper water resource investment.

Assessment of smart irrigation controllers under subsurface and drip-irrigation systems for tomato yield in arid regions

2015 ◽  
Vol 66 (10) ◽  
pp. 1086 ◽  
Author(s):  
H. M. Al-Ghobari ◽  
F. S. Mohammad ◽  
M. S. A. El Marazky
Keyword(s):  
Irrigation Water ◽  
Drip Irrigation ◽  
Irrigation System ◽  
Irrigation Scheduling ◽  
Irrigation Systems ◽  
Tomato Crop ◽  
Tomato Yield ◽  
Irrigation Water Use ◽  
Scheduling Irrigation ◽  
Use Efficiency

Here, two types of smart irrigation controllers intended to reduce irrigation water are investigated under Saudi Arabia’s present water crisis scenario. These controllers are specially made for scheduling irrigation and management of landscaping. Consequently, the aim of this study is to adapt the efficient automated controllers to tomato crops, and for extension to other similar agricultural crops. The controllers are based on evapotranspiration and have been shown to be promising tools for scheduling irrigation and quantifying the water required by plants to achieve water savings. In particular, the study aims to evaluate the effectiveness of these technologies (SmartLine SL 1600and Hunter Pro-C) in terms of the amount of irrigation applied and compare them with conventional irrigation scheduling methods. The smart irrigation systems were implemented and tested under drip irrigation and subsurface irrigation for tomato (cv. Nema) in an arid region. The results revealed significant differences between the three irrigation-scheduling methods in both the amount of applied water and yield. For example, each 1 mm water depth applied to the tomato crop via subsurface (or drip) irrigation by SmartLine, Hunter Pro-C, and the control system yielded 129.70 kg (70.33 kg), 161.50 kg (93.47 kg), and 109.78 kg (108.32 kg), respectively. Generally, the data analysis indicates that the Hunter Pro-C system saves water and produces a higher yield with the greatest irrigation water-use efficiency (IWUE) of the irrigation scheduling methods considered. Moreover, the results indicate that the subsurface irrigation system produced a higher yield and IWUE than the drip system.

scholarly journals Fertigation of Maize with Digestate Using Drip Irrigation and Pivot Systems

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1453
Author(s):  
Viviana Guido ◽  
Alberto Finzi ◽  
Omar Ferrari ◽  
Elisabetta Riva ◽  
Dolores Quílez ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Nitrogen ◽  
Drip Irrigation ◽  
Liquid Fraction ◽  
Growing Season ◽  
Northern Italy ◽  
Irrigation Systems ◽  
Nitrogen Use ◽  
Use Efficiency ◽  
Reference Fields

Digestate is a nutrient-rich fertilizer and appropriate techniques are required for its application during the maize season to reduce losses and increase the nitrogen use efficiency (NUE). The performance of two different fertigation techniques (drip irrigation and pivot) were assessed using the digestate liquid fraction. A two-year field test was carried out at two different sites in Lombardy, northern Italy. At each site, fertigation with pivot (P-F, site 1) or drip (D-F, site 2) systems was compared to reference fields where the same irrigation techniques without addition of digestate were used. During the two seasons, the performance of the fertigation systems, amount of fertilizers used, soil nitrogen content, yields, and nitrogen content of the harvested plants were monitored. The digestate application averaged 5 m3/ha per fertigation event with P-F and 4.9 m3/ha with D-F corresponding, respectively, to 28 and 23 kg N/ha. Both irrigation systems were suitable for fertigation provided that the digestate was adequately filtrated. Our results suggest that fertigation with digestate, if properly managed, can be applied during the growing season up to the full amount of nitrogen required by the crop.

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