Effectiveness of a subsurface irrigation system with ceramic emitters under low-pressure conditions

Cai, Yaohui; Yao, Chunping; Wu, Pute; Zhang, Lin; Zhu, Delan; Chen, Junying; Du, Yaping

doi:10.1016/j.agwat.2020.106390

Cited by 18 publications

(7 citation statements)

References 49 publications

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“…Gil et al (2011) state that, as soon as the water flows through the emitter, there is a fast soil pressure increase in the first operation minutes and then the pressure stabilizes, as can be seen in this study, because we did not find for the statistically significant variation for the variable "Depth" (Table 3). Cai et al (2021) claim that when starting irrigation in a low moisture soil, the total soil water potential is too negative due to the matric potential prevalence: at this moment, the soil water potential gradient would promote a fast water flow rate through the dripper and the emitter discharge in soil would be greater than in the air. As the water content in the soil increases, the matric potential also increases and the soil energy becomes less negative and the infiltration rate decrease, which normally tends to also decrease the emitter flow rate.…”

Section: Resultsmentioning

confidence: 99%

“…The use of subsurface drip irrigation systems has been increasing due to its advantages over surface one, such as greater efficiency in water use and application, lower soil water evaporation and agricultural production improvements (Nogueira et al, 2021). However, in subsurface irrigation, soil physical and hydraulic properties can influence the hydraulic characteristics of the emitter (Wang et al, 2021) which contributes to the water distribution uniformity of this system can be lower than one for surface drip irrigation system (Cai et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Backpressure effects on emitters flow rate in subsurface drip irrigation

et al. 2022

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Subsurface drip irrigation success depends on surpassing the backpressure obstacle, a phenomenon which occurs when the water application intensity exceeds the infiltration rate of soil, which reduces the emitter flow rate. Thus, this study aimed to determine the flow rate variation, in relation to surface flow, of four drip emitters when buried at two depths in a loam soil (Yolo Loam soil), and the backpressure generated by the soil on subsurface condition. The cavity radius developed around the emitters outlet was also obtained. The experiment was conducted in a completely randomized design, in a strip-plot scheme, with three treatments: installation depth of driplines (two levels: 0.10 and 0.20 m); dripline type (four levels: D5000, JardiLine, TalDrip and and Hydro PCND) and irrigation time (three levels: 0.5, 1.0 and 3.0 h). The results showed that the flow rate variation between the surface and subsurface application on Yolo Loam soil, with inlet pressure of 145 kPa, was greater the higher was the emitter flow rate. For pressure-compensating emitters, even under backpressure influence, this was not enough to cancel the pressure-compensating device operation, of the emitters. The emitters installation depth, as well the irrigation time, did not affect the backpressure and, consequently, the flow rate variation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Backpressure effects on emitters flow rate in subsurface drip irrigation

et al. 2022

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“…Creating uniform and adequate soil moisture is one of the most challenging issues in irrigated lands. The use of irrigation systems with high water e ciency, such as a sub-irrigation system that provides the optimum water content of the soil, is recommended as a solution to reduce water losses (Adu et al, 2019;Cai et al, 2021) for many orchards at arid and semi-arid regions (Tesfay 2011; Bhople et al 2014; Al-Mayahi et al 2020). Information about soil moisture variability is also an important factor when planning sub-irrigation systems (Bhayo et al 2018;Saefuddin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimizing Soil Moisture in Subsurface Irrigation System Based on Porous Clay Capsule Technique

vaghei

Bahrami

Saleh

2023

Water Resour Manage

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A clay capsule is one of the porous pipes in a sub-irrigation system that can release water near the root zone. This paper has attempted to improve the physical and hydraulic properties of clay capsules based on changing the percentage of organic matter in the raw materials. The raw material used for making clay capsules is obtained from the calcareous soil of Nasr Abad village of Gorgan, Iran. The ratio of rice bran to calcareous soil as improving hydraulic properties was 1:2, 1:5, 1: 10, 1:15, and 1:20 (kg of rice bran to kg of air-dried soil). The produced clay capsules were named G2, G5, G10, G15, and G20 respectively. The water discharge and soil water distribution of clay capsules were measured at 10, 25, 50, 80, and 100 kPa of hydrostatic pressures by a discharge-pressure automation instrument. The results showed a signi cant relationship between discharges of porous clay capsules and organic matter mixed with raw material. Also, the results show that with increasing organic matter percentage in the clay capsule component, the discharge of clay capsules increased. The relationship between discharges of G10, G15, and G20 with hydrostatic pressure is linear, and in G2, and G5, this relationship becomes nonlinear. Meanwhile, the soil wetting shape followed a spherical trend due to the slow seepage of clay capsules. But the soil wetting shapes in G10, G15, and G20 were completely spherical, and in G5 and G2 trended to ellipsoid vertically. Finally, this is of signi cance for irrigating plants in arid and semi-arid regions. Highlights-Introduction of sub-irrigation method that apply for irrigating plants in arid and semi-arid regions.-Introduction of buried porous clay capsule that can release water in near root zone.-Introduction of a solution to reduce water losses for many orchards at arid and semi-arid regions -Introduction of the soil wetness by clay capsule types for installing into the soil.

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“…Creating uniform and adequate soil moisture is one of the most challenging issues in irrigated lands. The use of irrigation systems with high water e ciency, such as a sub-irrigation system that provides the optimum water content of the soil, is recommended as a solution to reduce water losses (Adu et al, 2019;Cai et al, 2021) for many orchards at arid and semi-arid regions (Tesfay 2011; Bhople et al 2014; Al-Mayahi et al 2020). Also, information on soil moisture variation is an important factor for managing a sub-irrigation system design (Bhayo et al 2018;Saefuddin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Hydraulic Properties of Porous Clay Capsules for Providing Soil Moisture in Subsurface Irrigation System

vaghei

Bahrami

Saleh

2022

Preprint

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Clay capsule is one of the porous pipes in sub irrigation system that can release water in near root zone. This paper has attempted to improve the physical and hydraulic properties of clay capsules based on organic matter percent changes in the raw materials. Raw material used for making clay capsules is obtained from calcareous soil of Nasr Abad village of Gorgan, Iran. The ratio of rice bran to calcareous soil as improving hydraulic properties was 1:2, 1:5, 1: 10, 1:15 and 1:20 (kg of rice bran to kg of air-dried soil). The produced clay capsules were named G2, G5, G10, G15 and G20 respectively. The water discharge and soil water distribution of clay capsules were measured at 10, 25, 50, 80, 100 kPa of hydrostatic pressures by discharge-pressure automation instrument. The results showed that a significant relationship between discharges of porous clay capsules and organic matter mixed in raw material. Also, the results show that with increasing organic matter percentage in clay capsule component, the discharge of clay capsules increased. The relationship between discharges of G20 with hydrostatic pressure is linear and in G2, G5, G10, and G15, this relationship becomes non-linear. Meanwhile, soil wetting shape followed a spherical trend due to the slow seepage of clay capsules. But the soil wetting shapes in G15 and G20 was completely spherical, and in G10, G5 and G2 trend to ellipsoid vertically. Finally this is of significance for irrigating plants in arid and semi-arid regions.

show abstract

Effectiveness of a subsurface irrigation system with ceramic emitters under low-pressure conditions

Cited by 18 publications

References 49 publications

Backpressure effects on emitters flow rate in subsurface drip irrigation

Backpressure effects on emitters flow rate in subsurface drip irrigation

Optimizing Soil Moisture in Subsurface Irrigation System Based on Porous Clay Capsule Technique

Optimizing the Hydraulic Properties of Porous Clay Capsules for Providing Soil Moisture in Subsurface Irrigation System

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