Development of a soil wetting pattern estimation model for drip irrigation

Li, Yuchen; Nie, Wei‐Bo; Feng, Zhengjiang

doi:10.2166/ws.2022.429

Cited by 5 publications

(2 citation statements)

References 64 publications

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“…Li et al [41] indicated that soil-wetting patterns significantly affect the spatial structure of cotton root under mulched drip irrigation. Li et al [54] found that the larger the emitter discharge rate, the shallower the wetting soil body, and the migration rate and time of the wetting front fit the power function. Small-flow drip-irrigation treatment has achieved higher yield in this experiment, which may be related to the shape of the wetting body and plant roots: (1) Under the same soil type and the same irrigation quota, when the drip emitter is small, the drip irrigation forms a deep, narrow wetting body [55].…”

Section: Discussionmentioning

confidence: 99%

Coupling Regulation of Root-Zone Soil Water and Fertilizer for Summer Maize with Drip Irrigation

Liu

Wang

et al. 2022

Water

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Water scarcity is the most significant constraint for grain production in the North China Plain (NCP). Water-saving irrigation technology is a valuable tool for addressing the NCP’s water scarcity. Drip irrigation is considered as one of the most water-saving irrigation technologies. However, drip irrigation is not now commonly used in NCP field grain crops (particularly maize). Fertilizers are accurately administered to summer-maize root soil by recycling the drip-irrigation system of winter wheat. To increase the water and fertilizer-use efficiency of summer-maize fields, the coupling body of root-zone soil water and fertilizer for summer maize was thoroughly adjusted using a combination of emitter flow rate, irrigation quota, and fertilizer frequency. In this experiment, a split plot design with randomized blocks was employed. The primary plot was emitter flow rate (0.8 and 2.7 L/h), the subplot was irrigation water quota (120 and 150 m3/hm2, 1 hm2 = 10,000 m2), and the final plot was fertigation frequency (7, 14, and 28 days). The grain yield, water-use efficiency and fertilizer-use efficiency of summer maize were measured in this study. The results showed that grain yield and water-use efficiency (WUE) of the small-flow drip-irrigation treatment (emitter flow rate < 1 L/h) were significantly higher than the large-flow treatment (emitter flow rate > 1 L/h); the rates of grain yield increase were 8.2% and 13.3% and WUE were 3.5% and 8.0%, respectively. A higher irrigation quota can increase the yield of summer maize. The maximum yield and WUE were observed at the fertigation frequency of 7 days under small-flow drip-irrigation conditions. All comparisons and analyses showed that small-flow drip irrigation combined with high fertigation frequency could obtain higher yield and WUE in the NCP. This study proposes a new way to improve water and fertilizer utilization efficiency to achieve the goal of “increasing grain yield by fertilizing” and “adjusting the quality by fertilizing”, from the perspective of winter wheat–summer maize no-tillage annual rotation planting.

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Section: Discussionmentioning

confidence: 99%

Coupling Regulation of Root-Zone Soil Water and Fertilizer for Summer Maize with Drip Irrigation

Liu

Wang

et al. 2022

Water

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“…Drip flow rate is considered one of the most important parameters in the system design and management and can significantly affect the irrigation efficiency. With the same irrigation amount, a smaller drip flow rate has greater vertical depth of the soil wetted zone than a higher drip flow rate, and a larger drip flow rate results in a wide and shallow wetted zone [21,22]. Zhang et al reported that a drip flow rate of 1.38 L/h had 59% and 32% less soil matric potential than that of 2.0 and 3.0 L/h at a shallow soil depth (10-40 cm) and 56% and 20% higher soil matric potential than that of 2.0 and 3.0 L/h at a deep soil depth (70 cm), respectively [23].…”

Section: Effects Of Various Drip Tape Layouts and Drip Emitter Flow R...mentioning

confidence: 99%

Effects of Drip Tape Layout and Flow Rate on Water and Nitrogen Distributions within the Root Zone and Summer Maize Yield in Sandy Tidal Soil

Sun,

Zhang,

et al. 2023

Agronomy

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Drip tape layout and flow rate are crucial variables that impact the effects of drip fertigation. To investigate the influence of drip tape layout and flow rate on the soil water and nitrogen transport in summer maize in sandy tidal soil, field experiments were conducted for two years. Two drip tape layouts were set: one tape serving for two crop rows (N) and one tape serving for each crop row (E), with two levels of drip flow rate, i.e., high (2 L/h; H) and low (1.3 L/h; L). The results show that under the same drip tape layout, the lower the drip emitter flow rate, the more upright the shape of wetted soil volume. The maximum vertical and horizontal water transport distance under NL treatment was higher than that under NH, EH, and EL treatments. After surface drip fertigation, nitrate nitrogen accumulated near and at the edge of the wetted soil volume. In 2020, under NL treatment, nitrate nitrogen transported to a 55 cm soil layer, which was 22.22%, 71.42%, and 57.14% deeper than that under NH, EH, and EL treatments, respectively. In 2021, nitrate nitrogen could transport to a 60 cm soil layer in both NL and NH treatments. The maximum concentration of ammonium nitrogen was nearby the emitter. Under NL treatment, ammonium nitrogen was transported to 48 and 60 cm soil layers below the emitter in 2020 and 2021, respectively, which was deeper than that observed under NH, EH, and EL treatments. The soil inorganic nitrogen residue of the NL was lower than that of the NH, EH, and EL treatments. Compared with NH, EH, and EL treatments, the two-year maize yield under NL treatment increased by 11.09%, 13.47%, and 8.66% on average, respectively. NL treatment exhibited the highest water use efficiency and nitrogen fertilizer productivity. Therefore, NL treatment (one drip tape serving for two rows with 1.3 L/h flow rate) could promote the absorption of water and nutrients, reduce inorganic nitrogen residue, and to obtain high maize yield in sandy tidal soil.

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Subsurface flow model for estimating 2D wetting pattern in drip irrigation

Reddy,

Singh

2024

CLEAN Soil Air Water

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Numerical model using 2D Richard’s equation in cylindrical polar coordinate system was developed to assess the soil wetting patterns in a drip irrigation system. A fully implicit finite‐difference scheme was used to solve equations with suitable initial and boundary conditions. The developed model was validated with an experimental result available in the literature, which shows a high level of concordance with low values of RMSE and R2 greater than 0.93 for all discharge rates. Furthermore, the versatility and applicability of the model were demonstrated for complex subsurface conditions considering homogeneous and heterogeneous soil profiles. Water ponding on the surface was observed in clay loam soil, contrasting with deep percolation in sandy loam soil. This underscores the significance of adjusting both discharge rate and irrigation frequency in accordance with prevailing soil conditions.

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Development of a soil wetting pattern estimation model for drip irrigation

Cited by 5 publications

References 64 publications

Coupling Regulation of Root-Zone Soil Water and Fertilizer for Summer Maize with Drip Irrigation

Coupling Regulation of Root-Zone Soil Water and Fertilizer for Summer Maize with Drip Irrigation

Effects of Drip Tape Layout and Flow Rate on Water and Nitrogen Distributions within the Root Zone and Summer Maize Yield in Sandy Tidal Soil

Subsurface flow model for estimating 2D wetting pattern in drip irrigation

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