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2021, Šinžlèh uhaany akademijn mèdèè
ABC Journal of Advanced Research
Effects of Operating Pressure, Nozzle Diameter and Wind Speed on the Performance of Sprinkler in Irrigation System during Water ApplicationOwing to an increasing demand for irrigation water associated with the massive expansion of irrigated sugarcane farms in Ethiopia, there is a need to use the available water efficiently and effectively. Accordingly, a study was conducted to evaluate the effect of operating pressure and nozzle size on the field performance of dragline sprinkler system at Wonji/Shoa Sugar Estate. The study was conducted under three wind phases (morning, mid-day and late afternoon) using three operating pressures (250 kPa, 300 kPa and 350 kPa) and two nozzle sizes (4.4 and 4.8 mm). Uniformity measurements were performed using single sprinkler and four sprinklers configurations. An application efficiency of low-quarter of 41% to 80.3% and actual application efficiency of low-quarter of 30.1% to 37.5% were achieved under the respective test combinations. Christiansen’s coefficient of uniformity of 71.7% to 86.3%, and distribution uniformity of 61% to 80.3% were achieved under different test combinations ...
IOSR Journals
Effect of Weather Conditions, Operating Pressure and Riser Height on the Performance of Sprinkler Irrigation System2019 •
This study was conducted during February and May 2016 at the Demonstration Farm of the Faculty of Agriculture, University of Khartoum at Shambat (Longitude 32o 32`32`E, Latitude 15o 40`40`N and Altitude 380 m amsl), on a total area of 40m× 30m, with the objective of determining water distribution efficiency due to the effect of different weather conditions during three periods in the day (morning 08:00-09:00 a.m., midday 12:00-02:00 p.m., evening). The study also included determination of Christiansen's coefficient of uniformity (CU%) and the distribution uniformity (DU%) for each of the above mentioned periods under two operating pressures of 1.0 and 2.0 bar and two riser heights of 1.0 and 1.5 m. Plastic sprinkler heads (LEGO) sing1e nozzle type were used .The experiment consisted of testing the effect of wind, evaporation and drift losses on water distribution uniformity (Christiansen's coefficient of uniformity-CU% and uniformity of distribution-DU%). The Randomized Complete Block Design (RCBD) was used. The meteorological data (Wind speed, air temperature and relative humidity) were obtained from Shambat weather station at the times of tests. Data were analysed using Statistical Analysis System programme (SAS).The statistical analysis showed that there were significant differences (P ≥ 0.05) in CU% and DU% values at the different periods of the day under the two operating pressures and the two riser heights. The highest CU% and DU% values of 84% and 78%, respectively, were obtained in the morning tests under the operating pressure of 2.0 bar and riser height of 1.0 m. Higher efficiencies were obtained at low wind speeds , high relative humidity and low temperatures. All CU% and DU% values were within the acceptable range as stated by the previous publications. Operating pressure and riser height should be considered when designing sprinkler systems, while the prevailing weather conditions should be considered when operating the system.
International Journal of Engineering
Performance’s Comparison Study Between Center Pivot Sprinkler and Surface Irrigation System2015 •
Irrigation methods are significantly affects crop yield. Field experiment was conducted to evaluate the performance of center pivot irrigation system (CPS) and surface irrigation (SI) system with view to water application efficiency (Ea %), distribution coefficient (Du %), storage efficiency (Es %), coefficient uniformity (Cu %) Scheduling coefficient (Sc %), yield and water use efficiency (WUE) at two projects in the River Nile State (RNS), Sudan during the winter season of 2011-2012. The results showed that the Cu, Du, Ea and Sc % for the CPS were higher than those recorded by SI in the both seasons. Also, results revealed that the yield of wheat and potato under CPS was higher than the SI. The total amounts of water applied under CPS were 9019 (wheat) and 11024 m3 ha-1 (potato), while under the SI were 20000 (wheat) and 22857.6 m3 ha-1 (potato). Technical water use efficiency (TWUE) values for wheat and potato under the CPS system were found to be 1.913, and 0.205, respectively. ...
Journal of Agricultural Science and Engineering
Technical Performance Evaluation of Center Pivot Sprinkler Irrigation Systems in the Atbara River Region, Sudan2021 •
The study was conducted during winter season 2019/2020, under desert high terrace soil in the eastern bank of the Atbara River. The growing adoption of modern irrigation systems, especially center pivot irrigation systems, requires the necessity of knowing the efficient use during operation, and thus identifying the characteristics of water distribution under these systems. The experimental units consist of four center pivot sprinkler irrigation systems. The climate is semi-desert with warm winters. The result for evapotranspiration using Penman-Monteith ranged from 5.69 to 6.26 mm/day for November and December, then alfalfa crop (Medicago sativa) consumptive use was 6.14 to 6.89 mm/day, respectively. The results for sprinkler (nozzles) configuration represented 27.4, 35.8, 50.3 and 38.0% of the total sprinklers were installed without spray nozzles for the systems 1, 2, 3 and 4, respectively. The uniformity coefficients (CU) were 87.1, 80.0, 84.1, and 83.4% at a rotational speed of 50% for the irrigation systems 1, 2, 3 and 4, respectively. Distribution uniformity (DU) values were ranged from 68.7 to 75.3%. Application efficiency (AE) ranged from 93.2 to 98.3% and the potential efficiency of low quarter (PELQ) values ranged from 64.8 to 72.2%. The results showed that, hydraulic performance of CU, DU and PELQ for the centre pivot systems were affected by the different management practices gave an indication of non-compliance with the design specifications regarding the arrangement and distribution of sprinklers which leads to an unacceptable irrigation scheduling.
Revista Brasileira de Engenharia Agrícola e Ambiental
Water distribution model for center pivot end gun sprinklers2019 •
End gun sprinklers can increase the irrigated area by center pivot irrigation systems without a substantial investment. This study was carried out at the Universidade Federal de Lavras, MG state, Brazil, and aimed to describe and validate a water distribution model for center pivot end gun sprinklers. The gun sprinkler PLONA-RL250®, attached at the end point of a center pivot, was used to evaluate the model in field tests. The sprinkler working conditions considered were nozzle diameters of 14 x 6 mm, working pressure of 292 kPa, and four asymmetric wetted angle adjustments (95 + 20º; 90 + 90º; 60 + 60º; 45 + 45º). These tests were carried out for wind speed lower than 0.9 m s-1. The measured and simulated irrigation depths showed an average absolute difference of 0.65 mm and determination coefficients from 71.55 to 89.37%. Based on the confidence coefficient (c = 0.82) the model can be classified as very good (0.76 ≤ c ≤ 0.85). Sprinkler wetted angle adjustment of 110º (95 + 20º) r...
Biosystems Engineering
Performance of new agricultural impact sprinkler fitted with plastic nozzles2014 •
2012 •
The main objective of irrigation is to apply the optimum amount of water to the crop root zone that the crop needs for development and which cannot be provided by rains. When irrigation systems are used to apply fertilizers and pesticides, application uniformity becomes even more critical. Consequently, it is important for center pivot owners and operators to periodically check the uniformity of their systems. Therefore, the main objective of this study was evaluating the coefficient of uniformity for center pivot sprinkler irrigation in order to address the potential of uniform irrigation application using center pivot sprinkler irrigation. The uniformity of water application under a center pivot is determined by setting out 24 catch cans with a 9 cm opening diameter and 11.5 cm height located along a line extending radially from the point 70 meter away from the center of the pivot at 2 m spacing between each can, bringing the irrigation system up to proper operating pressure, and ...
International Journal of Current Microbiology and Applied Sciences
Testing of Twin-Nozzle Agricultural Sprinklers for Field Use2020 •
Arab Universities Journal of Agricultural Sciences
Effect of Nozzles design on the performance of Impact Sprinklers in sprinkler irrigation system2020 •
2020 •
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