Fertigation Uniformity Affected by Injector Type

Bracy, Regina P.; Parish, R. L.; Rosendale, Roger M.

doi:10.21273/horttech.13.1.0103

Cited by 23 publications

(11 citation statements)

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“…Bracy et al . () also obtained better fertilizer distribution with the Venturi injector and proportional pump compared with the continuously diluting injector in greenhouse experiments.…”

Section: Introductionmentioning

confidence: 82%

“…Bracy et al . () found that injection rates resulting from various pressure differences had a more significant impact on fertigation uniformity than injector type, and the uniformity of fertilizer distribution in the field was greater with a low injection rate than that with a higher injection rate.…”

Section: Introductionmentioning

confidence: 98%

“…As an efficient water‐saving fertilizer application technology that greatly improves the utilization of water and fertilizer resources, drip fertigation helps alleviate water shortages and reduces agricultural fertilizer pollution. Water and fertilizer distribution uniformity are important considerations for the design and operation of drip fertigation systems because non‐uniform applications of water and fertilizer may reduce crop yield (Li and Rao, ; Zhao et al ., ; Wang et al ., ), contaminate groundwater and surface water (Allaire‐Leung et al ., ; Barragan et al ., ) and degrade soil quality (Bracy et al ., ; Wang et al ., ). Several factors such as injector type, pressure difference and lateral layout can potentially affect the water and fertilizer distribution uniformity of drip fertigation systems.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Drip Fertigation Uniformity Affected by Injector Type, Pressure Difference and Lateral Layout

Fan

Zhang

et al. 2017

Irrigation and Drainage

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The effects of three injector types (differential pressure tank, Venturi injector and water‐driven piston proportional pump), three pressure differences (0.10, 0.15 and 0.20 MPa) and two lateral layouts (longitudinal and transversal) on drip fertigation uniformity were comprehensively evaluated through field experiments. No statistically significant differences in water uniformity were found between injector types or pressure differences, while the influence of lateral layouts on water uniformity was significant (α = 0.05). All affecting factors showed an extremely significant influence on fertilizer uniformity (α = 0.01). Water uniformity was better than fertilizer uniformity, both of which generally decreased with increasing pressure differences. The differential pressure tank produced a lower water and fertilizer uniformity than the Venturi injector and proportional pump. The longitudinal lateral layout produced lower fertigation uniformity than the transversal lateral layout. To ensure both high water and fertilizer uniformity in fertigation systems, a Venturi injector and a proportional pump with relatively constant fertilizer concentration are recommended. When a differential pressure tank is used, the differential pressure should be minimized to mitigate the decrease in fertilizer concentration. The differential pressure tank can give high fertigation uniformity (≥ 90%) comparable to the Venturi injector and proportional pump if the transversal lateral layout is further applied. The research provides scientific guidance for the design and operational management of drip fertigation systems in greenhouse vegetables or field crops. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Bracy et al . () also obtained better fertilizer distribution with the Venturi injector and proportional pump compared with the continuously diluting injector in greenhouse experiments.…”

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Drip Fertigation Uniformity Affected by Injector Type, Pressure Difference and Lateral Layout

Fan

Zhang

et al. 2017

Irrigation and Drainage

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“…Nutrient distribution uniformity through drip irrigation mainly depends on system operating pressure, fertilizer type, injection device, length of lateral and dripper type (Santos et al, 1997;Imas, 1999;Patel and Rajput, 2000;Jiusheng et al, 2007;Kumar et al, 2012Kumar et al, , 2014. The urea fertilizer distribution uniformity decreased with increase in drip-line length, however it increased with increase in the operating pressure (Townsend, 1988;Bracy et al, 2003;Kumar et al, 2014). Venturi is the most commonly used device for fertilizer injection through drip irrigation (Bucks and Nakayama, 1980;Nakayama and Bucks, 1986;Sivanappan et al, 1987;Ah Koon et al, 1990;Hanson et al, 1997;Prasad, 1997;Li, and Rao, 2003;Abdallah EL-Amin et al, 2006;Jiusheng et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Efficient Design of Drip Irrigation System using Water and Fertilizer Application Uniformity at Different Operating Pressures in a Semi‐Arid Region of India

Kumar

Rajput

et al. 2017

Irrigation and Drainage

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Performance evaluation of irrigation has been an important area of research for better management of water resources. The present study was conducted to evaluate the effect of drip lateral lengths and system operating pressures on water and fertilizer application uniformity at the Indian Agricultural Research Institute (IARI), New Delhi, India. The following parameters of nutrients and water were studied to design and evaluate the performance of drip irrigation systems: (i) uniformity coefficient; (ii) discharge variation; (iii) distribution uniformity; (iv) statistical uniformity. Drip‐line lengths and system operating pressures (P < 0.05 and P < 0.01) significantly affect the different parameters of fertilizer and water application. The highest values of uniformity coefficient (99.2%), statistical uniformity (99.2%) and distribution uniformity (97.4%) for irrigation water were observed at a pressure of 1.5 kg cm−2 with a 25 m long drip‐line. Lower values of discharge variation (2.65%) and coefficient of variation (0.04) were observed at the same operating pressure (1.5 kg cm−2) and drip‐line length. However, the lowest value of the uniformity coefficient (88.1%), statistical uniformity (93.7%) and distribution uniformity (93.2%) for irrigation water were recorded at 0.5 kg cm−2 pressure with a 100 m long drip‐line length. The highest values of urea, potassium and phosphorus distribution uniformity were found to be 97.8, 97.1 and 98.2%, respectively, at 1.5 kg cm−2 pressure with 25 m long drip‐line, and lower values of urea, potassium and phosphorus distribution uniformity (93.1, 92.6 and 93.2%, respectively) were recorded at 0.5 kg cm−2 pressure with a 100 m long drip‐line. Water and fertilizer distribution uniformity decreased with increase in drip‐line length, and increased with increase in system operating pressure. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Bracy et al (2003) explored the relationship between type of injector and fertigation uniformity, concluding that the type of crop and its water and nutrient needs dictate the best injector. Li et al (2007) conducted similar tests and recommended injectors that provide a constant rate of injection in order to provide uniform fertilizer distribution.…”

Section: Introductionmentioning

confidence: 99%

Fertigation techniques for use with multiple hydrozones in simultaneous operation

et al. 2011

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Site-specific delivery of fertilizer is a useful tool to address differences in crop need. Modern systems with wirelessly networked sensors and valves allow multiple hydrozones to be created more easily than traditional wired systems. This allows irrigation and fertigation rates to be varied across small portions of a field. However, fertigation to multiple hydrozones with different fertilizer requirements may be complex if each zone cannot be fertigated in an independent set. Instead, it might be necessary to operate several fertigation zones simultaneously. This raises a concern over the ability to deliver fertilizer uniformly within each zone. Four fertigation strategies were tested. The conventional method was to fertigate multiple hydrozones at different times. Three site-specific strategies were considered, involving overlapping fertigation phases in multiple hydrozones. Fertilizer distribution uniformity tests were conducted with a 64-emitter drip line to determine which strategy gave the most uniform distribution of fertilizer within a hydrozone. All fertigation techniques performed well, with fertilizer distribution uniformities between 0.88 and 0.96. Selection of the optimum site-specific fertigation strategy will depend on crop needs, scheduling limitations, and system design parameters such as emitter type, fluid travel time, and slope. Similar to conventional fertigation, the main factor in fertilizer distribution uniformity for this study was drip emitter variability. In the presence of sloped terrain, the site-specific control strategy that involved a delay between fertilizer injection and flushing had the least uniform fertilizer application.

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Fertigation Uniformity Affected by Injector Type

Cited by 23 publications

References 0 publications

Evaluation of Drip Fertigation Uniformity Affected by Injector Type, Pressure Difference and Lateral Layout

Evaluation of Drip Fertigation Uniformity Affected by Injector Type, Pressure Difference and Lateral Layout

Efficient Design of Drip Irrigation System using Water and Fertilizer Application Uniformity at Different Operating Pressures in a Semi‐Arid Region of India

Fertigation techniques for use with multiple hydrozones in simultaneous operation

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