Effect of manifold layout and fertilizer solution concentration on fertilization and flushing times and uniformity of drip irrigation systems

Tang, Pan; Li, Hong; Issaka, Zakaria; Chen, Chao

doi:10.1016/j.agwat.2018.01.010

Cited by 29 publications

(15 citation statements)

References 16 publications

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“…The common drip irrigation system in Xinjiang usually needs a fertilizer equipment (also called pressure tank) to apply water-soluble fertilizer, which leads to a gradual decrease of fertilizer concentration in water with the increase of irrigation amount and irrigation time [36,37] . Under this condition, the interaction of irrigation and fertilization will affect the accumulation of nitrate-nitrogen in the soil.…”

Section: Table 4 Effects Of Different Irrigation and Nitrogen Levels On Nitrogen Transportation In Leaves And Stems And Nitrogen Incremenmentioning

confidence: 99%

“…The nitrogen accumulation in tillage and deeper layers (40-80 cm soil depth) first increased, reached the maximum in the flowering stage, and then decreased with the sunflower growth.The quantity of soil nitrate-nitrogen in the shallow soil decreased noticeably, but it remained higher in the deeper soil because the formation of sunflower seeds required large amounts of soil nitrogen in the shallow soil. Some studies showed that the reduction of nitrate accumulation in the tillage soil layer under heavy irrigation was related not only to the crop's consumption of nitrate but also to leaching triggered by the irrigation[35] .The common drip irrigation system in Xinjiang usually needs a fertilizer equipment (also called pressure tank) to apply water-soluble fertilizer, which leads to a gradual decrease of fertilizer concentration in water with the increase of irrigation amount and irrigation time[36,37] . Under this condition, the interaction of irrigation and fertilization will affect the accumulation of nitrate-nitrogen in the soil.…”

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confidence: 99%

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Coupling effects of water and nitrogen on photosynthetic characteristics, nitrogen uptake, and yield of sunflower under drip irrigation in an oasis

Wang

et al. 2021

International Journal of Agricultural and Biological Engineering

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An experiment was conducted in an oasis area in northwest China to assess the coupling effects of water and nitrogen supply through drip irrigation on photosynthetic characteristics, nitrogen uptake, and yield of sunflower (Helianthus annuus L.), as well as the nitrate distribution in the root-zone soil. The experiment included three irrigation levels (210 [W1], 300 [W2], and 390 [W3] mm), three nitrogen levels (162 [N1], 232 [N2], and 302 [N3] kg/hm 2 ), and control treatment (no fertilization during whole growth period and only irrigated at the budding stage) . A nitrogen content over-accumulation in the soil was observed under the low irrigation amount with high fertilizer supply, which cannot enhance the sunflowers' absorption of nitrogen. Excessive irrigation caused leach of the soil nitrogen, reduced nitrogen content in the root-zone soil (0-40 cm) and limited nitrogen uptake by the crop. Although low irrigation amount with high fertilizer supply can increase the nitrogen content in the soil, it cannot enhance the sunflowers' absorption of nitrogen . At the vegetative stage of sunflower growth, the accumulation of nitrogen in the organs was mainly concentrated in the leaves, while it was transferred to the flower disk at the reproductive growth stage. Reasonable coupling of water and nitrogen improved the transport of nitrogen from leaves and stems to the flower disk and promoted the formation of yield components. Six regression equations were established with irrigation and fertilization amount as independent variables, and seed rate, seed weight per flowerdisk, 1000 grain weight, yield, water use efficiency and nitro gen partial factor productivity as dependent variables, respectively. Multiple regression and spatial analysis suggested that the irrigation amount of 241.62-253.35 mm and the fertilization application of 202.02-209.40 N kg/hm 2 was a good irrigation strategy, under which all six factors exceed 75% of their maxima, and the yield of sunflower reached 3 229.3 kg/hm 2 .

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Section: Table 4 Effects Of Different Irrigation and Nitrogen Levels On Nitrogen Transportation In Leaves And Stems And Nitrogen Incremenmentioning

confidence: 99%

mentioning

confidence: 99%

Coupling effects of water and nitrogen on photosynthetic characteristics, nitrogen uptake, and yield of sunflower under drip irrigation in an oasis

Wang

et al. 2021

International Journal of Agricultural and Biological Engineering

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“…Up till now, with the rapid development of computational fluid mechanics (CFD) [15][16][17][18][19][20], many researches about the pressure pulsation and TLF have been carried out simultaneously, but those kinds of literature mostly focus on the flow structure of TLF and tip leakage vortex and there are few reports about the relationship between TLF and pressure pulsation. For instance, Liu et al [21][22][23] conducted numerical simulations for a mixed-flow pump with different tip clearances using a commercial CFD code to study the tip leakage vortex structure and trajectory.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Shi

et al. 2020

Shock and Vibration

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In order to investigate the effect of various impeller tip clearances on the pressure pulsation in a mixed-flow pump, the energy performance test and pressure pulsation experiment of a mixed-flow pump with different tip clearances are studied simultaneously. The pressure pulsation signals at impeller inlet, middle, and oulet are processed and analyzed by the wavelet transform. The results show that the change of tip clearance can affect the head and efficiency of mixed-flow pump. Under designed flow rate, when the tip clearance increases from 0.2 mm to 1.1 mm, the head and efficiency decrease by 18.1% and 11.6%, respectively. Due to the strong influence of blade passing frequency (BPF) at impeller middle, the period of pressure pulsation curve is about 1/4 of impeller rotation period. At impeller inlet, the low-frequency pulsation with energy concentration is the main disturbance frequency, and, with the increase of tip clearance, not only does the high-value region of wavelet spectrum expand to low-frequency direction but also it is easy to form second-order peaks in the time-averaged wavelet curve. At impeller outlet, affected by BPF and rotor-stator interaction (RSI), the high-frequency disturbance in RSI area decreases first and then increases. The wavelet coherence demonstrates the stable low-frequency disturbances in comparison to others and it will affect the flow field at impeller middle.

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“…Chemigation is the injection of any chemical such as fertilizers, micronutrients, or pesticides into irrigation water and is applied to the land using an irrigation system. Fertigation is specifically the application of fertilizer through an irrigation system, and has been widely used throughout the world [1][2][3]. The proper use of chemigation is recognized as the best management practice for irrigated agriculture.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Tang

Chen

Hong

2020

Water

Self Cite

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Injectors are key pieces of equipment for chemigation systems, and their hydraulic performance has a significant effect on chemigation systems and crops. In order to investigate the influence of different working parameters on hydraulic performance for a water-powered proportional injector (PI), three key parameters of inlet and injection flow rate were researched using a one-factor experimental design method. The regression equations between different factors and response variables were established through a response surface method based on one-factor experimental results. Lastly, a mathematical model of the actual injection ratio was established. Some experiments under different, randomly selected parameter combinations were carried out to verify the prediction precision of the mathematical mode. The results showed that the injection flow rate increased first within the differential pressure of 0.05 to 0.10 MPa and then tended towards stability with increasing differential pressure. The injection flow rate decreased by increasing the viscosity and the change in the injection flow rate was small enough when the viscosity was greater than 500 mPa·s. The impact factors, in order of significance, for inlet flow rate were differential pressure, viscosity of injection liquid and setting injection ratio. The impact factors, in order of significance, for injection flow rate were viscosity of injection liquid, setting injection ratio and differential pressure. The regressive model for predicting the actual injection ratio was validated using an experiment and the relative deviation between calculated value and tested value was less than 5.98%, which indicated that the mathematical model had high credibility.

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Effect of manifold layout and fertilizer solution concentration on fertilization and flushing times and uniformity of drip irrigation systems

Cited by 29 publications

References 16 publications

Coupling effects of water and nitrogen on photosynthetic characteristics, nitrogen uptake, and yield of sunflower under drip irrigation in an oasis

Coupling effects of water and nitrogen on photosynthetic characteristics, nitrogen uptake, and yield of sunflower under drip irrigation in an oasis

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

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