Uniformity of Drip Irrigation System With Liquid Peat on Different Slopes

Lopes, Allan Remor; Boas, Márcio Antônio Vilas; Pazuch, Felix Augusto; Corte, Luciano Dalla; Gomes, Benedito Martins; Prates, Rosebel Trindade Cunha

doi:10.15809/irriga.2021v1n2p357-366

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…The greatest pressure difference was observed in the level system with 2 g L -1 (95.86%) and the downhill system (96.97%). Similar results were reported by Lopes et al (2021b). The process capability index (PCI) was calculated using only the lower control limit (LCL), with 80% and 90% adopted as good and excellent, respectively, following Frizzone et al (2012) for CUC and DUC classification (Table 8).…”

Section: Resultsmentioning

confidence: 59%

“…SPC techniques can be used to analyze parameters like application uniformity (Andrade et al, 2007). Some studies, such as those of Frigo et al (2016), Hermes et al (2015), Zocoler et al (2015), Andrade et al (2007), Siqueira et al (2018), andLopes et al (2021b), have used this technique to understand the behavior of different irrigation designs. One of the techniques that can be used to analyze parameters, such as application uniformity, is the Shewhart Chart (Andrade et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Monitoring urea concentration at different slope angles in drip fertigation

Kepp,

Boas,

Haupentha

et al. 2023

Rev. ambiente água

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The use of statistical process control tools in irrigation is becoming widespread as it allows for quick and effective investigation and detection of possible problems with drippers, especially when fertilizer is used in irrigation water and different slopes. Therefore, the research used statistical quality control charts to monitor urea concentration at different inclinations of the lateral line. The experiment was conducted in a protected environment at the Irrigation and Fertigation Laboratory - LIF) in the city of Cascavel, Paraná State, Brazil. It followed a randomized block design, in a 4x3 factorial arrangement, in which fertilizer concentrations were evaluated at three slope angles. Experimental plots were divided into two factors. The first is the type of water (clean water from an artesian well and water with a nitrogen fertilizer at 44% N) subdivided into four subplots, representing concentrations of urea (0, 2, 4, and 6 g L-1). The second factor was slope angle and represented the sub-plots: uphill (2%), level (0%), and downhill (2%). The results show that Shewhart's statistical control charts were sensitive in observing the change in uniformity due to the increase in fertilizer concentration. Water with fertilizer (4 gL-1) affected uniformity at all studied slope levels. The results also show that high concentrations of fertilizers change the pH of the water. The lowest urea concentrations showed the best distribution uniformity results. Keywords: control charts, drip irrigation, Shewhart, uniformity.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Monitoring urea concentration at different slope angles in drip fertigation

Kepp,

Boas,

Haupentha

et al. 2023

Rev. ambiente água

View full text Add to dashboard Cite

show abstract

“…This approach to statistical process control techniques, where one treatment is classified as better than the other by the number of out-of-control points, has already been used by other authors. Lopes et al (2021) for example, when evaluating the uniformity of a drip fertigation system with liquid peat at different inclinations reached the conclusion that liquid peat presents excellent uniformity (>90%) when used for drip irrigation systems. However, even with instability in the process, Lopes points out that the low-level application was the most uniform, followed by the upslope and downslope treatments, respectively.…”

Section: Resultsmentioning

confidence: 99%

Statistical process control in pulsed drip irrigation systems

Cossich,

Boas,

Kepp

et al. 2024

Rev. ambiente água

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Pulse drip application is a management option to prevent clogging and improve water-use efficiency. The measurement of distribution uniformity is opportune for pulse irrigation projects to ensure efficiency since the shorter the pulse time, the more negative influence the transition periods have. The objective of the present work was to monitor the quality of a drip irrigation system with different emitter models and different pulse times. The experiment was conducted under laboratory bench conditions, and 25 tests were performed for each pulse application (2, 3, 6 and 12 minutes) and emitter model (non-compensated and auto-compensated). Uniformity was determined using Christiansen's uniformity coefficient (CUC) and distribution uniformity coefficient (DUC) and monitored by Shewhart control charts and exponentially weighted moving average (EWMA). The decrease in pulse time caused a decrease in flow rate and uniformity only in drip irrigation systems with non auto-compensated emitters. However, this decrease is subtle, to the point that uniformity presented an excellent performance for all pulses tested. The use of the Shewhart and EWMA control charts were effective in monitoring the uniformity of the pulsed drip irrigation system. The Shewhart control chart was more robust in identifying isolated non-compensated uniformities, while the EWMA control chart was more sensitive in identifying unstable propensity. In the treatments with the non-compensated emitter, the statistical process control was able to identify that shorter pulse times resulted in greater application instability. As for the auto-compensated emitters, the statistical process control highlighted the concern with application uniformity after maintenance interference. Keywords: anti-drain emitter, high-frequency irrigation, irrigation interval, statistical quality control.

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Emitter clogging and distribution uniformity in nitrogen fertigation

Cunha,

Teixeira

et al. 2024

Rev. bras. eng. agríc. ambient.

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Despite highly efficient, the main limitation of using drip irrigation for fertigation with nitrogen (N) fertilizers is the sensitivity of emitters to clogging by contaminants. The objective in this study was to assess the effect of different sources of N fertilizer and different operation times on water distribution uniformity and emitter clogging using a localized surface drip irrigation system. A randomized block experimental design with three replicates was used, in a 5 × 6 factorial arrangement consisting of five N sources (potassium nitrate, ammonium sulfate, calcium nitrate, ammonium nitrate, and urea) and six operation times (100, 200, 300, 400, 500, and 600 hours). The same nitrogen (N) rate applied in all treatments was equivalent to 100 kg ha-1. The drip tubing used had a nominal flow of 2 L h-1, nominal diameter of 16 mm, internal diameter of 13 mm, operating pressure of 100 to 350 kPa, and spacing between emitters of 0.7 m. The variables evaluated were: statistical uniformity coefficient, absolute uniformity coefficient, and degree of clogging. The best absolute and statistical uniformity coefficients were found when using urea and ammonium nitrate for fertigation, mainly at the longest operation times, which presented the best water application uniformity (>91.72%).

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Uniformity of Drip Irrigation System With Liquid Peat on Different Slopes

Cited by 4 publications

References 11 publications

Monitoring urea concentration at different slope angles in drip fertigation

Monitoring urea concentration at different slope angles in drip fertigation

Statistical process control in pulsed drip irrigation systems

Emitter clogging and distribution uniformity in nitrogen fertigation

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