scholarly journals Backpressure effects on the flow-pressure relation of driplines

2016 ◽  
Vol 36 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Michael S Thebaldi ◽  
Luiz A Lima ◽  
Willian F. de Almeida ◽  
Rafaella R Andrade
Keyword(s):  
Drip Irrigation ◽  
The Other ◽  
Subsurface Drip Irrigation ◽  
Atmospheric Conditions ◽  
Hydraulic Characteristics ◽  
Flow Rates ◽  
Hydraulic Behavior ◽  
Irrigation Design ◽  
Flow Pressure ◽  
Subsurface Drip

ABSTRACT For drip irrigation design and management, it is necessary to know the relation between flow and pressure acting on emitters. In the case of subsurface drip irrigation, the backpressure phenomenon may change the hydraulic characteristics of emitters. Thus, this study aimed at determining such relationship between flow and pressure of different driplines in surface and subsurface conditions; aiming to find possible differences in hydraulic behavior. We tested four emitter types; two pressure compensating (D5000 and Hydro PCND) and two non-pressure compensating (TalDrip and Jardiline). Emitter flow rates were attained in atmospheric conditions and submerged in water, in which submergence levels represented backpressure. Assays were performed using inlet pressures of 80, 100, 120, and 150 kPa for the Hydro PCND dripline and 25, 50, 100, and 150 kPa for the other ones; the backpressures were of 0.49, 1.47, 2.45, 4.41 and 6.37 kPa with four replications. The emitters had their proportionality constants and discharge exponents changed in submerged applications, representing backpressure effect. Non-pressure compensating emitters had their discharge exponent decreased, while in pressure compensating ones, it was increased. Backpressure reduced emitter flow rates at all evaluated pressures.

Effects of Dripper Discharge and Irrigation Amount on Soil-Water Dynamics under Subsurface Drip Irrigation

2011 ◽  
Vol 347-353 ◽  
pp. 2400-2403 ◽  
Author(s):  
Xiao Ning Mei ◽  
Zhen Zhong Shen ◽  
Jie Ren ◽  
Zhen Hua Wang
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Water Dynamics ◽  
Subsurface Drip Irrigation ◽  
Design Parameters ◽  
Wetting Front ◽  
Soil Water Dynamics ◽  
Irrigation Amount ◽  
Irrigation Design ◽  
Subsurface Drip

Subsurface drip irrigation (SDI) that has a wide application prospect is one of the high efficiency water-saving irrigation techniques. Research on regulation of soil-water dynamics in irrigation design parameters of SDI has important points in improving its irrigation design and guiding its practical function. In this study, soil wetting patterns were investigated in laboratory experiments which were operated at three different dripper discharges (0.76, 1.15 and 1.25 l h-1) and two different irrigation amounts (4.6 and 9.2 l). The results showed that, (1) with the increase of dripper discharges from 0.76 l h-1 to 1.25 l h-1, water content around the emitter are increasing from 0.225 cm3 cm-3 to 0.300 cm3 cm-3, (2) increasing the dripper discharge and irrigation amount increased the size of the wetted zone, (3) upward distance of the wetting front is less than downward distance and horizontal distance of the wetting front presents symmetry distribution at the same the dripper discharges and irrigation amount, (4) with the increase of irrigation amounts from 4.6 l to 9.2 l, water contents of the vertical and horizontal direction are increasing 10% to 20%.

SUBSURFACE DRIP IRRIGATION USING LIVESTOCK WASTEWATER: DRIPLINE FLOW RATES

2000 ◽  
Vol 16 (5) ◽  
pp. 505-508 ◽  
Author(s):  
T. P. Trooien ◽  
F. R. Lamm ◽  
L. R. Stone ◽  
M. Alam ◽  
D. H. Rogers ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Subsurface Drip Irrigation ◽  
Livestock Wastewater ◽  
Flow Rates ◽  
Subsurface Drip

Evaluation of subsurface drip irrigation design and management parameters for alfalfa

2012 ◽  
Vol 109 ◽  
pp. 81-93 ◽  
Author(s):  
Maziar M. Kandelous ◽  
Tamir Kamai ◽  
Jasper A. Vrugt ◽  
Jiří Šimůnek ◽  
Blaine Hanson ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Subsurface Drip Irrigation ◽  
Irrigation Design ◽  
Subsurface Drip

scholarly journals Onion Storage Decomposition Unaffected by Late-season Irrigation Reduction

2000 ◽  
Vol 10 (1) ◽  
pp. 176-178 ◽  
Author(s):  
Clinton C. Shock ◽  
Erik B.G. Feibert ◽  
Lamont D. Saunders
Keyword(s):  
Water Potential ◽  
Drip Irrigation ◽  
High Frequency ◽  
Total Yield ◽  
Soil Water Potential ◽  
The Other ◽  
Subsurface Drip Irrigation ◽  
Long Day ◽  
Four Levels ◽  
Subsurface Drip

Long-day onion (Allium cepa L.) `Vision' was submitted to four soil water potential (SWP) treatments using subsurface drip irrigation in 1997 and 1998. Onions were grown on two double rows spaced 22 inches (56 cm) apart on 44-inch (112-cm) beds with a drip tape buried 5 inches (13 cm) deep in the bed center. SWP was maintained at four levels by automated, high frequency irrigations based on SWP measurements at an 8-inch (20-cm) depth. The check treatment had SWP maintained at -20 cbar (kPa) during the entire season. The other three treatments had SWP maintained at -20 cbar until 15 July, then reduced to -30, -50, or -70 cbar. Reducing the SWP level after 15 July below -20 cbar failed to reduce onion bulb decomposition in storage, but reduced colossal onion yield in 1997, and marketable and total yield in 1998.

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.

Tomato (Solanum lycopersicum) production under subsurface drip irrigation with two types of drip tape

2019 ◽  
pp. 397-404
Author(s):  
J.V. Prado-Hernández ◽  
F.R. Hernández-Saucedo ◽  
M. Carrillo-García ◽  
J. Pineda-Pineda ◽  
A.H. Gutiérrez-Campos ◽  
...  
Keyword(s):  
Solanum Lycopersicum ◽  
Drip Irrigation ◽  
Subsurface Drip Irrigation ◽  
Subsurface Drip
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