scholarly journals Emitter discharge variability of subsurface drip irrigation in uniform soils: effect on water-application uniformity

2008 ◽  
Vol 26 (6) ◽  
pp. 451-458 ◽  
Author(s):  
M. Gil ◽  
L. Rodríguez-Sinobas ◽  
L. Juana ◽  
R. Sánchez ◽  
A. Losada
Keyword(s):  
Drip Irrigation ◽  
Subsurface Drip Irrigation ◽  
Water Application ◽  
Subsurface Drip ◽  
Emitter Discharge

scholarly journals Water saving and yield increase of sugar beet with subsurface drip irrigation

2013 ◽  
Vol 4 (2) ◽  
pp. 85-91 ◽  
Keyword(s):  
Sugar Beet ◽  
Drip Irrigation ◽  
Sugar Content ◽  
Water Saving ◽  
Subsurface Drip Irrigation ◽  
Water Application ◽  
Yield Increase ◽  
Crop Performance ◽  
Subsurface Drip ◽  
Sugar Beet Crop

This study was conducted to evaluate the surface and subsurface drip irrigation (SDI) application effects on sugar beet crop performance, under two levels (100% and 80%) of water application depth. The experimental design was a split plot with four replications. Laterals were set every second crop row (1 m apart), with emitters spaced 1 m apart. In the case of SDI, laterals were buried 0.45 m under the ground. Soil moisture measurements were taken up to 75 cm depth, using the TDR method. The soil water content and the yield characteristics of each treatment were recorded. Irrigation method showed to affect crop performance significantly while water application level was less critical. The experimental results indicated that the subsurface drip irrigation leaded to a greater yield and higher sugar content making significant water saving compared to surface drip irrigation.

Application of the steady-state principle of constant-head well permeameter to indirect subsurface drip irrigation

2009 ◽  
Vol 89 (5) ◽  
pp. 671-676 ◽  
Author(s):  
Z Weixia ◽  
C Huanjie ◽  
Z Zhenhua ◽  
S Zhijie
Keyword(s):  
Steady State ◽  
Hydraulic Conductivity ◽  
Drip Irrigation ◽  
Discharge Rate ◽  
Saturated Hydraulic Conductivity ◽  
Subsurface Drip Irrigation ◽  
Equilibration Time ◽  
Constant Head ◽  
Subsurface Drip ◽  
Emitter Discharge

Indirect subsurface drip irrigation (ISDI) is a method of increasing the irrigation water use efficiency of drip irrigation without the need to bury irrigation tubes and wet the soil surface. A major problem of ISDI is the mismatch between emitter discharge rate and water-conducting device dimension, which will result in over-filling of application water. In this paper, we propose to use the steady-state principle of constant-head well permeameter (CHWP) to quantify the relationship between emitter discharge rate and water-conducting device dimension for ISDI. CHWP tests and ISDI tests were carried out in a 300 m2 winter wheat fallow to verify its feasibility. The steady-state characteristic of these two methods was also studied using long-term infiltration. Results indicate that the equilibration time (110 min) in the ISDI tests was greater than that in the CHWP tests (30 min). The steady ponded depth in ISDI had a smaller variation than the steady water discharge rate in the CHWP. When using the steady-state principle of CHWP to design ISDI systems, there was significant linear correlation between predicted and measured ponded depth values (R2 = 0.8379). The soil field-saturated hydraulic conductivity calculated by these two tests was approximately equal. These results demonstrate that the steady-state principle of CHWP could be used to select appropriate irrigation systems for ISDI, and ISDI provides another technique to obtain the field-saturated hydraulic conductivity. Key words: Constant-head well permeameter, field-saturated hydraulic conductivity, indirect subsurface drip irrigation, steady-state

scholarly journals Evolution of the spherical cavity radius generated around a subsurface drip emitter

2010 ◽  
Vol 7 (2) ◽  
pp. 1935-1958 ◽  
Author(s):  
M. Gil ◽  
L. Rodríguez-Sinobas ◽  
R. Sánchez ◽  
L. Juana
Keyword(s):  
Drip Irrigation ◽  
Spherical Cavity ◽  
Water Distribution ◽  
Subsurface Drip Irrigation ◽  
Positive Pressure ◽  
Irrigation Performance ◽  
Cavity Radius ◽  
Soil Pressure ◽  
Subsurface Drip ◽  
Emitter Discharge

Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the cavity radius. This pressure in the soil is very sensitive to the cavity radius. In this paper, the development of the cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.

scholarly journals Evolution of the spherical cavity radius generated around a subsurface drip emitter

2010 ◽  
Vol 7 (6) ◽  
pp. 1983-1989 ◽  
Author(s):  
M. Gil ◽  
L. Rodríguez-Sinobas ◽  
R. Sánchez ◽  
L. Juana
Keyword(s):  
Drip Irrigation ◽  
Spherical Cavity ◽  
Water Distribution ◽  
Subsurface Drip Irrigation ◽  
Positive Pressure ◽  
Irrigation Performance ◽  
Cavity Radius ◽  
Soil Pressure ◽  
Subsurface Drip ◽  
Emitter Discharge

Abstract. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the cavity radius. This pressure in the soil is very sensitive to the cavity radius. In this paper, the development of the cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance are also shown.

scholarly journals Evaluation of Root Water Uptake and Urea Fertigation Distribution under Subsurface Drip Irrigation

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1487 ◽  
Author(s):  
Mohamed Galal Eltarabily ◽  
Khaled M. Bali ◽  
Abdelazim M. Negm ◽  
Chihiro Yoshimura
Keyword(s):  
Drip Irrigation ◽  
Nitrate Concentration ◽  
Sandy Loam ◽  
Irrigation Event ◽  
Subsurface Drip Irrigation ◽  
Soil Types ◽  
Silty Loam ◽  
Loam Soil ◽  
Subsurface Drip ◽  
Emitter Discharge

Shallow groundwater contamination by nitrate is frequent in agricultural lands in Egypt because of the use of urea fertilizers. The urea transformation process in the vadose zone was simulated using a HYDRUS-2D model, Software package for simulations of 2D movement of water, heat, and multiple solutes in variably saturated media, for subsurface drip irrigation. The root water and nutrient uptake were assessed for three soil types (sandy loam, loam, and silty loam) with three emitter discharge levels (1.0 L h−1, 1.50 L h−1, and 2.0 L h−1), for a comparison of three fertigation strategies (A) at the beginning, (B) at the end, and (C) at the middle of the irrigation cycle. The extension of the wetted area mainly depends on soil hydraulic conductivity. The high emitter discharge with a short irrigation time is suitable for shallow-rooted crops. The cumulative flux was highest for silty loam soil and the lowest was for the sandy loam soil (1891, and 1824 cm3) for the 2 L h−1 emitter discharge within the 35 days simulation. The cumulative drainage significantly differs among soil types with little effect of emitter discharge. It recorded 1213, 295, 11.9 cm3 for sandy loam, loam, silty loam, respectively. Urea transformation is controlled by hydrolysis and nitrification as well as the adsorption coefficient of ammonium. Nitrate distribution is mainly governed by soil type rather than the emitter discharge where the sandy loam soil is more highly susceptible to nitrate leaching than to silty loam. Nitrate concentration has recorded the minimum possible level when applying the urea fertilizer at the beginning of the irrigation event for sandy loam and loam soil while for the silty loam soil, urea application at the middle of the irrigation event is more effective. Urea application at the end of the irrigation event gives the highest accumulated leached nitrate concentration below the root zone and should be avoided (the worst strategy).

Subsurface Drip Irrigation and Fertigation of Broccoli

2002 ◽  
Vol 66 (1) ◽  
pp. 178 ◽  
Author(s):  
Thomas L. Thompson ◽  
Thomas A. Doerge ◽  
Ronald E. Godin
Keyword(s):  
Drip Irrigation ◽  
Subsurface Drip Irrigation ◽  
Subsurface Drip

Behaviour of the fecal pollution indicators in a soil irrigated with treated wastewater under onsurface and subsurface drip irrigation

2000 ◽  
Vol 42 (1-2) ◽  
pp. 75-79 ◽  
Author(s):  
C. Campos ◽  
G. Oron ◽  
M. Salgot ◽  
L. Gillerman
Keyword(s):  
Organic Matter ◽  
Drip Irrigation ◽  
Organic Matter Content ◽  
Fecal Pollution ◽  
Fecal Coliforms ◽  
Subsurface Drip Irrigation ◽  
Treated Wastewater ◽  
Reclaimed Wastewater ◽  
Pollution Indicators ◽  
Subsurface Drip

A critical objective for any wastewater reuse programme is to minimise health and environmental hazard. When applying wastewater to soil–plant systems, it is to be noted that the passage of water through the soil considerably reduces the number of microorganisms carried by the reclaimed wastewater. Factors that affect survival include number and type of microorganisms, soil organic matter content, temperature, moisture, pH, rainfall, sunlight, protection provided by foliage and antagonism by soil microflora. The purpose of this work was to examine the behaviour of fecal pollution indicators in a soil irrigated with treated wastewater under onsurface and subsurface drip irrigation. The experiment was conducted in a vineyard located at a commercial farm near the City of Arad (Israel). Wastewater and soil samples were monitored during the irrigation period and examined for fecal coliforms, somatic and F+ coliphages and helminth eggs. Physico-chemical parameters were controlled in order to determine their relationship with removal of microorganisms. The results showed high reduction of the concentration of microorganisms when wastewater moves through the soil; and a good correlation between the reduction of fecal pollution indicators and moisture content, organic matter concentration and pH. The application of secondary treated domestic wastewater in this specific soil and under these irrigation systems affect the survival of microorganisms, thus reducing the health and environmental risk.

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