scholarly journals Modeling and Dynamic-Simulating the Water Distribution of a Fixed Spray-Plate Sprinkler on a Lateral-Move Sprinkler Irrigation System

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2296 ◽  
Author(s):  
Yisheng Zhang ◽  
Jinjun Guo ◽  
Bin Sun ◽  
Hongyuan Fang ◽  
Delan Zhu ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Water Distribution ◽  
Irrigation System ◽  
Translational Motion ◽  
Simulated Data ◽  
Sprinkler Irrigation ◽  
Distribution Patterns ◽  
Superposition Method ◽  
Working Pressure ◽  
Uniformity Coefficient

Uniformity of water distribution plays an important role in evaluating irrigation quality. As necessities in calculating irrigation uniformity during designing a lateral-move sprinkler irrigation system (LMSIS), the water distribution patterns of individual sprinkler in motion are crucial. Considering the limitation of the experiment platform, dynamic water distribution of an isolated sprinkler is difficult to measure, especially for a fixed spray plate sprinkler (FSPS) which LMSIS has been widely equipped with in China, therefore developing a model to simulate dynamic water distribution of a moving sprinkler is necessary. The objective of this study was to develop and validate the theoretical basis for calculating water distribution characteristics of a single FSPS in translational motion applying a superposition method, and provide an optimized operation management of LMSIS. The theoretical model’s validity was verified in an indoor experiment using a Nelson D3000 FSPS in motion with 36 grooves and blue-plate spray heads. The software was programmed using the Eclipse Platform and the software was capable of simulating water distribution pattern and Christiansen uniformity coefficient (Cu). The results indicated that the water distribution simulated by the software presents three peaks of maximum application under varying conditions, and the value of water application peaks decreased as working pressure and/or mounting height increased. Conversely, the wetted diameter increased as working pressure and/or mounting height increased. Working pressure, mounting height, and sprinkler spacing each had a significant effect on the Cu. The Cu increased as working pressure and/or mounting height increased but decreased as sprinkler spacing increased. As a consequence, the model can be used to predict the relative water distribution pattern; and the Cu can be calculated with the simulated data, thus providing a tool for designing a new LMSIS.

scholarly journals INFLUENCE OF THE WATER DISTRIBUTION UNIFORMITY AND IRRIGATION DEPTH ON THE YIELD OF IRRIGATED BEAN CROP

Irriga ◽  
2009 ◽  
Vol 14 (4) ◽  
pp. 458-469 ◽  
Author(s):  
Everardo C. Mantovani ◽  
Gregório G. Faccioli ◽  
Brauliro Gonçalves Leal ◽  
Antonio Alves Soares ◽  
Luis Claudio Costa ◽  
...  
Keyword(s):  
Water Depth ◽  
Water Distribution ◽  
Irrigation System ◽  
Winter Season ◽  
Sprinkler Irrigation ◽  
Field Capacity ◽  
Uniformity Coefficient ◽  
Irrigation Depth ◽  
Distribution Uniformity ◽  
Bean Crop

INFLUENCE OF THE WATER DISTRIBUTION UNIFORMITY AND IRRIGATION DEPTH ON THE YIELD OF IRRIGATED BEAN CROP  Everardo C. Mantovani1; Gregório G. Faccioli2; Brauliro Gonçalves Leal3;Antônio Alves Soares1; Luis Cláudio Costa1; Paulo Sérgio L. Freitas4 1Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, MG [email protected]úcleo de Estudos e Pesquisas do Nordeste, Universidade Federal de Sergipe, São Cristovão, SE3Intec Consultoria e Assessoria Ltda, Viçosa, MG4Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR  1 ABSCTRACT This study aimed to evaluate the influence of the water distribution uniformity and three irrigation depths on the production variables for the bean crop, using a conventional sprinkler irrigation system, during the winter season. The treatments consisted of three irrigation depths and two uniformity levels of water distribution represented by the Christiansen uniformity coefficient (CUC). In the treatments L1A and L1B a sufficient water depth was applied to raise the soil water content to field capacity. The distribution uniformities (CUCs) were higher and lower than 80%, respectively. In treatments L2A and L3A, and L2B and L3B, the applied water depths corresponded to 50% and 150% of that applied to the LIA treatment. Because of rainfall events until the sampling date, no significant differences at 5% probability were found among treatments, when the variables were: leaf number, leaf area and dry matter. The F test for the contrast among the treatments with high and low uniformity was significant at 5% probability, when using 50% replacement of the water depth required by the crop. Significant differences were observed at 5% probability for pod number per plant among the treatments, when using 150, 100 and 50% replacement of the water depth required by the crop KEYWORDS: irrigation uniformity, sprinkler irrigation, yield.  MANTOVANI, E. C.; FACCIOLI, G. G.; LEAL, B. G.; SOARES,A. A.; COSTA, L. C.; FREITAS, P. S. L. INFLUÊNCIA DA UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA E LÂMINA DE IRRIGAÇÃO NA PRODUTIVIDADE DO FEIJÃO  2 RESUMO O presente trabalho teve como objetivo avaliar a influência da uniformidade de distribuição de água e de três lâminas de irrigação nas variáveis de produção da cultura do feijão, utilizando um sistema de aspersão convencional, no período de inverno. Os tratamentos constaram de três lâminas de irrigação e dois níveis de uniformidade de distribuição de água, representados pelo coeficiente de uniformidade de Christiansen (CUC). Nos tratamentos L1A e L1B foi aplicada uma lâmina de água suficiente para elevar a umidade do solo à capacidade de campo, com uniformidade de distribuição (CUC) maior e menor que 80%, respectivamente. Nos tratamentos L2A e L3A, e L2B e L3B as lâminas aplicadas foram, respectivamente, 50% e 150% da lâmina aplicada no tratamento L1A. Não existiram diferenças significativas, a 5% de probabilidade, nos tratamentos para seguintes variáveis: número de folhas, área foliar e matéria seca, em razão das chuvas ocorridas até a data da amostragem. O teste F para o contraste entre os tratamentos de alta e baixa uniformidade com 50% de reposição da lâmina requerida pela cultura foi significativo a 5% de probabilidade. Observou-se diferenças significativas, a 5% de probabilidade entre os tratamentos com 150, 100 e 50% de reposição da lâmina requerida pela cultura, para o número de vagens por planta. UNITERMOS: Uniformidade de irrigação, irrigação por aspersão, produtividade.

scholarly journals Effect of Pulsating Pressure on Water Distribution and Application Uniformity for Sprinkler Irrigation on Sloping Land

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 913 ◽  
Author(s):  
Lin Zhang ◽  
Boyang Fu ◽  
Naiwang Ren ◽  
Yu Huang
Keyword(s):  
Distribution Pattern ◽  
Flow Rate ◽  
Complex Terrain ◽  
Water Distribution ◽  
Constant Pressure ◽  
Sprinkler Irrigation ◽  
Water Application ◽  
Uniformity Coefficient ◽  
Sloping Land ◽  
Distribution Uniformity

Crops are highly susceptible to drought in sloping land. Due to its good adaptability to complex terrain, sprinkler irrigation is one of the commonly used methods for sloping land. To improve water application uniformity for sprinkler irrigation on sloping land, an experiment was conducted on an artificial slope to determine the effects of pulsating versus constant pressure on sprinkler flow rate, radius of throw, water distribution pattern, and water application uniformity. Compared with sprinkler flow rate and water distribution uniformity at constant pressure, sprinkler flow rate was not reduced, but water distribution uniformity for a single sprinkler was improved due to the decreased uphill throw, downhill throw and the ratio of downhill throw to uphill throw at pulsating pressure. The Christiansen Uniformity Coefficient (CU) value of water distribution for a single sprinkler at pulsating pressure was about 10% higher than that of constant pressure. When water distribution of single sprinkler overlapped with rectangular arrangement, CU values for pulsating pressure were on average 4.06% higher than those for constant pressure with different sprinkler spacings. Thus, pulsating pressure is recommended for use in sprinkler irrigation on sloping land to improve water application uniformity.

scholarly journals Controlled sprinkler irrigation system for agricultural plant cultivation

2021 ◽  
Vol 922 (1) ◽  
pp. 012046
Author(s):  
P Satriyo ◽  
I S Nasution ◽  
D V Della
Keyword(s):  
Soil Moisture ◽  
Precision Agriculture ◽  
Water Distribution ◽  
Industrial Revolution ◽  
Irrigation System ◽  
Water Discharge ◽  
Sprinkler Irrigation ◽  
Agricultural Product ◽  
Agricultural Plant ◽  
Controlling System

Abstract In recent decades, precision agriculture and smart farming have become promising issues particularly in the industrial revolution era 4.0. The main objective of this presented paper is to apply the optimized controlling system developed by means of Internet of things for controlling sprinkler irrigation systems used for agricultural product cultivation where in this study, we used shallot plants. The controlling systems were established by designing hardware and software used to monitor water distribution in sprinkler irrigation for onion plants during five initial days of cultivation. The result showed that controlled irrigation can optimize and monitor all plant growth indicators namely soil moisture, temperature, air humidity and water discharge and be able to carry out watering according to the desired level of soil moisture. It may conclude that a controlled sprinkler irrigation system can be applied as a part of precision agriculture practice in order to enhance production and sustainable agriculture.

scholarly journals The TECHNIQUE CHARACTERIZATION AND HYDRAULIC PERFORMANCE OF PERFORATED HOSE SYSTEM FOR SUGARCANE IN COLOMBIA

Irriga ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 336-346
Author(s):  
Christian José Mendoza ◽  
Javier Alí Carbonell ◽  
John Jairo Lasso
Keyword(s):  
Characteristic Equation ◽  
Water Distribution ◽  
San Antonio ◽  
Irrigation System ◽  
Hydraulic Performance ◽  
Research Center ◽  
Sugarcane Research ◽  
Uniformity Coefficient ◽  
Experimental Station ◽  
Valle Del Cauca

TECHNIQUE CHARACTERIZATION AND HYDRAULIC PERFORMANCE OF PERFORATED HOSE SYSTEM FOR SUGARCANE IN COLOMBIA     CHRISTIAN JOSÉ MENDOZA1; JAVIER ALÍ CARBONELL2 E JOHN JAIRO LASSO3   1Soil and Water Engineer, Agronomy Program, Colombian Sugarcane Research Center, San Antonio Experimental Station, Road Cali – Florida km 26, Candelaria, Valle del Cauca, Colombia, [email protected] 2Ex-Director Agronomy Program, Colombian Sugarcane Research Center, San Antonio Experimental Station, Road Cali – Florida km 26, Candelaria, Valle del Cauca, Colombia, [email protected] 3Agricultural Technician, Agronomy Program, Colombian Sugarcane Research Center, San Antonio Experimental Station, Road Cali – Florida km 26, Candelaria, Valle del Cauca, Colombia, [email protected]     1 ABSTRACT   Sugarcane crops in Colombia are traditionally irrigated, and a higher portion of  of the area with the irrigation system by furrows, where efficiency does not exceed 50% and present high application volumes per unit area. In pursuit of a more efficient use of water resources and conservation of the environment, a microirrigation system by perforated hose has been introduced recently. The objective of this research was to characterize and evaluate the performance of the perforated hose system. Therefore, to carry out this experiment, pressures 4, 5, 6, 7, and 8 PSI were evaluated, the flow in each orifice, and the water distribution in the system area. The following parameters were determined: (a) average flow rate, (b) coefficient of manufacture variation, (c) characteristic equation of the emitter/orifice, (d) distance between emitters, and (e) Christiansen Uniformity Coefficient-UC. The analyses showed coefficients of manufacture variation superior to 0.29 for all the pressures evaluated, and the UC were also very low for the system installation options in continuous furrow and alternate furrow, being superior to 43% and 52% respectively. The exponents x of the pressure versus flow equation will range from 0.119 to 0.813.   Keywords. Christiansen uniformity coefficient, coefficient of variation, characteristic equation.     MENDOZA, C.J.; CARBONELL, J.A.; LASSO, J.J. CARACTERIZAÇÃO TÉCNICA E DESEMPENHO HIDRÁULICO DO SISTEMA DE IRRIGAÇÃO POR MANGUEIRA PERFURADA PARA CANA-DE-AÇÚCAR NA COLÔMBIA     2 RESUMO   A cultura da cana-de-açúcar na Colômbia é irriga tradicionalmente e em maior porcentagem da área com o sistema de irrigação por sulcos, onde a eficiência não excede 50% e com altos volumes de aplicação por unidade de área. Em busca de um uso mais eficiente dos recursos hídricos e da conservação do meio ambiente, um sistema de microirrigação por mangueira perfurada foi introduzido recentemente. O objetivo desta pesquisa foi caracterizar e avaliar o desempenho do sistema por mangueira perfurada. Portanto, para realizar este experimento, se avaliaram as pressões de 4, 5, 6, 7 e 8 PSI, a vazão em cada orifício e a distribuição de água na área do sistema. Os seguintes parâmetros foram determinados: (a) vazão média, (b) coeficiente de variação de fabricação, (c) equação característica do emissor / orifício, (d) distância entre emissores e (e) Coeficiente de Uniformidade de Christiansen - CUC. As análises mostraram coeficientes de variação de fabricação superiores a 0,29 para todas as pressões avaliadas, também os CUC foram muito baixos para as opções de instalação do sistema em sulco contínuo e sulco alternado superiores a 43% e 52%, respectivamente. Os expoentes x da equação pressão versus fluxo variam de 0,119 a 0,813.   Palavras-chave: coeficiente de uniformidade de Christiansen, coeficiente de variação, equação característica.

scholarly journals Effect of Irrigation Pattern and Timing on Root Density of Young Citrus Trees Infected with Huanglongbing Disease

2014 ◽  
Vol 24 (2) ◽  
pp. 209-221 ◽  
Author(s):  
Davie M. Kadyampakeni ◽  
Kelly T. Morgan ◽  
Arnold W. Schumann ◽  
Peter Nkedi-Kizza
Keyword(s):  
Water Distribution ◽  
Root Length Density ◽  
Soil Depth ◽  
Irrigation System ◽  
Field Capacity ◽  
Distribution Patterns ◽  
Candidatus Liberibacter ◽  
Liberibacter Asiaticus ◽  
Fibrous Roots ◽  
Water Contents

Citrus (Citrus sp.) root length density (RLD) can help in understanding and predicting nutrient and water uptake dynamics. A study was conducted at two sites in Florida to investigate root and water distribution patterns among different irrigation and fertigation systems. The results over the 2 years showed that RLD was highest in the 0- to 15-cm soil depth and decreased with depth for all treatments at both sites. About 64% to 82% of the fibrous roots (<1 mm diameter) were concentrated in the irrigated zones of drip- and microsprinkler-irrigated trees and 18% to 36% were found in the nonirrigated zones at the Spodosol site (SS). At the Entisol site (ES), the RLD (<0.5 mm diameter) in the 0- to 15-cm depth soil for intensive microsprinkler or drip irrigation was 3- to 4-fold (nonirrigated zone) and 4- to 7-fold (irrigated zone) greater at the 0- to 15-cm soil depth than that for conventional irrigation system. The trees at SS were symptomatic for Huanglongbing (HLB; Candidatus Liberibacter asiaticus) in the second year, while those at ES were asymptomatic throughout the study. This might have limited the density and extent of root distribution at SS. The water contents remained either close to or slightly above the field capacity. The results showed higher RLD for intensive irrigation and fertigation practices in irrigated zones compared with conventional grower applications suggesting greater water and nutrient uptake potential for the former.

Theoretical and Experimental Study on Device Characteristics of Sprinkler Irrigation System

2010 ◽  
Author(s):  
Xingye Zhu ◽  
Shouqi Yuan ◽  
Jianrui Liu ◽  
Xinkun Wang ◽  
Bin Cai
Keyword(s):  
Experimental Study ◽  
Water Distribution ◽  
Theoretical Foundation ◽  
Irrigation System ◽  
Sprinkler Irrigation ◽  
Hydraulic Characteristics ◽  
Local Resistance ◽  
Distribution Maps ◽  
Resistance Loss ◽  
System Water

The resistance loss of sprinkler irrigation system is an important parameter, it has significance and practical value for studying its device characteristics. In this study, according to the selected materials and setting modes, both the pressure drop along the pipe and the local resistance loss were calculated out. The theoretical device characteristics of one sprinkler irrigation system was analyzed. A calculating schema has been carried out in order to apply the method to any sprinkling system. Experimental study was carried out for this system. Water distribution maps for the sprinklers were drawn using Matrix Laboratory (MATLAB). The hydraulic characteristics were as follow, 7.2, 3.0, 10.0 mm/h was the average, minimum, and maximum irrigated intensity, respectively. It supplied theoretical foundation for the reasonable application of sprinkler irrigation system for the future.

scholarly journals The Development of a Calculation Model for the Instantaneous Pressure Head of Oscillating Water Flow in a Pipeline

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1583 ◽  
Author(s):  
Kai Zhang ◽  
Bo Song ◽  
Delan Zhu
Keyword(s):  
Water Flow ◽  
Relative Error ◽  
Water Distribution ◽  
Irrigation System ◽  
Complex Function ◽  
Sprinkler Irrigation ◽  
Pressure Head ◽  
Calculation Model ◽  
Maximum Relative Error ◽  
Instantaneous Pressure

Sinusoidal oscillating water flow at low pressure can improve the anti-clogging ability of an emitter in drip irrigation or the water distribution of a nozzle in sprinkler irrigation and reduce the cost and energy consumption of the irrigation system. In this study, the characteristics of instantaneous pressure head attenuation of oscillating water flow along a pipeline have been investigated. By using a complex function to solve the continuity equation and the momentum equation of a pipeline with water hammer motion and using the Darcy–Weisbach formula to estimate the head loss, a calculation model for the instantaneous pressure head of oscillating water flow along a pipeline was developed. The measured value of the amplitude of the pressure head and the average instantaneous pressure head in the experiments have been used to verify the corresponding pressure head calculated by the model. The results show that the amplitude of the pressure head and the average instantaneous pressure head decrease linearly along the pipeline. The calculated value of the amplitude of the pressure head and the average instantaneous pressure head are basically close to the corresponding measured pressure head. From the results of all the tests, the maximum relative error of the calculated and measured value of the amplitude of the pressure head along the pipeline was 9.44%. The maximum relative error of the calculated and measured value of the average instantaneous pressure head along the pipeline was 8.37%. Hence, the model can accurately predict the instantaneous pressure head of oscillating water flow along a pipe and provide a theoretical basis for the application of oscillating water flow in irrigation systems and the design of irrigation pipe networks.

scholarly journals Calidad del riego por aspersión subfoliar en cacao (Theobroma cacao L.) en la finca San Vicente, Los Ríos, Ecuador

2018 ◽  
pp. 1
Author(s):  
Juan Tandazo Garcés ◽  
Oscar Caicedo Camposano ◽  
Carlos Salas Macías ◽  
Viviana Sánchez Vásquez
Keyword(s):  
Theobroma Cacao ◽  
Irrigation System ◽  
Sprinkler Irrigation ◽  
Pressure Head ◽  
Uniformity Coefficient ◽  
Coefficient Distribution ◽  
High Uniformity ◽  
Distribution Uniformity ◽  
Theobroma Cacao L

Quality of subfoliar sprinkler irrigation in Theobroma Cacao L. in San Vicente farm, Los Ríos, Ecuador Resumen Se realizó la evaluación del manejo de un sistema de riego por aspersión subfoliar en el cultivo de cacao, en donde el objetivo fue valorar su comportamiento hidráulico. Se estudiaron tres presiones de trabajo de los aspersores en cinco módulos del sistema. Los parámetros evaluados fueron: presiones al inicio y final de los laterales de riego, caudales en esos mismos sitios, coeficiente de uniformidad de Christiansen, uniformidad de distribución y área regada adecuadamente. Los resultados indican que existe una variación de presión y caudal por encima de lo teórico (20% y 10%). Se evidenció que altos coeficientes de uniformidad no representan la mayor área regada adecuadamente. Las presiones de trabajo estudiadas en los aspersores aseguran altos coeficientes de uniformidad del riego, no obstante, si lo que se desea es alcanzar la mayor área adecuadamente regada se debe operar a 275,79 kPa. Palabras claves: caudal; uniformidad; presión de trabajo. Abstract The evaluation of the management of a subfoliar sprinkler irrigation system in the cocoa crop was carried out, where the objective was to evaluate its hydraulic behavior. Three working pressures of the sprinklers were studied in five modules of the system. The parameters evaluated were: pressures at the beginning and end of the irrigation sides flow at those same sites, Christiansen Uniformity Coefficient, Distribution Uniformity and Adequately Irrigated Area. The results indicate that there is a variation of pressure and flow above the theoretical, that is, of 20% and 10%. It was evidenced that high uniformity coefficients do not represent the largest area irrigated adequately. The work pressures studied in the sprinklers ensure high coefficients of uniformity of irrigation, however, if what is desired is to reach the largest area adequately irrigated, it should be operated at 275.79 kPa. Keywords: flow; uniformity; pressure head.

scholarly journals UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA DE IRRIGAÇÃO POR ASPERSORES COMPENSANTES E NÃO COMPENSANTES EM DIFERENTES ALTURAS

Irriga ◽  
2016 ◽  
Vol 21 (4) ◽  
pp. 631-647 ◽  
Author(s):  
Jorge Tomoyoshi Tamagi ◽  
Miguel Angel Uribe Opazo ◽  
Jerry Adriani Johann ◽  
Marcio Antonio Vilas Boas
Keyword(s):  
Control Charts ◽  
Water Distribution ◽  
Sprinkler Irrigation ◽  
Northern Region ◽  
Statistical Control ◽  
Uniformity Coefficient ◽  
Irrigation Depth ◽  
Distribution Uniformity ◽  
And Control ◽  
Caixa Postal

UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA DE IRRIGAÇÃO POR ASPERSORES COMPENSANTES E NÃO COMPENSANTES EM DIFERENTES ALTURAS  JORGE TOMOYOSHI TAMAGI1; MIGUEL ANGEL URIBE-OPAZO2; JERRY ADRIANI JOHANN2 E MARCIO ANTONIO VILAS BOAS2 1 Universidade Estadual do Oeste do Paraná - UNIOESTE, Doutorando em Engenharia Agrícola no Programa de Pós-Graduação em Engenharia Agrícola – PGEAGRI. Rua Universitária, 2069 – Jd. Universitário – Caixa Postal 711 – CEP 85819-110 – Cascavel – PR, e-mail: [email protected] UNIOESTE, campus de Cascavel – PR, professores e pesquisadores do PGEAGRI, e-mails: [email protected]; [email protected]; [email protected].  1 RESUMO Este trabalho tem como finalidade contribuir para o desenvolvimento de técnicas adequadas para avaliação de sistemas de irrigação por aspersão, considerando que a uniformidade de distribuição da água afeta diretamente a lâmina bruta de irrigação. O experimento foi conduzido na região Norte de Cascavel, Paraná, (24º 55’ 04” latitude Sul, 53º 28’ 31” longitude Oeste e altitude de 785 m). Foram utilizadas duas parcelas de 10 x 10 m, denominadas S1 e S2, modificando-se somente a altura dos aspersores de 1,5 m para 1,0 m, respectivamente. Em cada parcela foram instalados 100 coletores, 4 aspersores super 10 bocal azul, compensante e, após 32 ensaios, foram substituídos por 4 aspersores super 10 bocal azul, não compensante. Foram determinados os seguintes coeficientes: Uniformidade de Christiansen, Uniformidade de Distribuição e Uniformidade Estatístico. Foram realizados estudos de inferência estatística e criadas cartas de controle para a análise do controle estatístico do processo, além dos índices de capacidade de processo (Cp) e desempenho do processo (Cpk). Os resultados mostraram que o aspersor compensante apresentou melhor desempenho à altura de 1,5 m (C-1,5 m) e que, entre as alturas de 1,0 m e 1,5 m, as melhores uniformidades de distribuição de água ocorreram na altura de 1,5 m. Palavras-chave: inferência estatística; cartas de controle; capacidade de processo.  TAMAGI, J. T.; URIBE-OPAZO, M. A.; JOHANN J. A.; VILAS BOAS, M. A. IRRIGATION WATER DISTRIBUTION UNIFORMITY BY COMPENSATING AND NON-COMPENSATING SPRINKLERS AT DIFFERENT HEIGHTS  2 ABSTRACT The uniformity of water application is an important factor to be considered in the assessment of sprinkler irrigation systems, since it directly affects gross irrigation depth, This work is a contribution for the development of appropriate techniques for assessment of results to improve the system. This trial was conducted  in the Northern region of Cascavel-PR (24º 55' 04" S, 53º 28' 31" W). Two 10 x 10 m plots were used and described as S1 and S2, according to the heights’ change of sprinklers, from 1.5 to 1.0 m, respectively. There were 100 collectors in each plot, plus 4 Super 10-blue-nozzle pressure compensating sprinklers, and, after 32 essays, they were replaced by 4 Super 10-blue-nozzle non pressure compensating sprinklers. The following coefficients were determined: Christiansen uniformity coefficient (CUC), coefficient of uniformity of distribution (CUD) and statistical uniformity coefficient (SUC). Statistical inference studies were carried out and control charts were generated to analyze the statistical control of the process, as well as Cp and Cpk indices. The results showed the best performance with the pressure compensating sprinklers irrigation at 1.5 m high (C-1.5 m) and that among the 1.0 m and 1.5 m heights the best water distribution uniformity was with the 1.5 m height. Keywords: Statistical analysis; Control Charts; Process Capacity.

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