scholarly journals Water Distribution Uniformity in Driping System Under Growing Pressures

2019 ◽  
Vol 7 (11) ◽  
pp. 14-21
Author(s):  
JHONATAN PIAZENTIN ◽  
João Luis Zocoler ◽  
Camila Pires Cremasco ◽  
Alfredo Bonini Neto ◽  
Luís Roberto Almeida Gabriel Filho
Keyword(s):  
Flow Rate ◽  
Water Distribution ◽  
High Efficiency ◽  
Environmental Cost ◽  
Agricultural Systems ◽  
Uniformity Coefficient ◽  
Number Of Factors ◽  
Cost Reductions ◽  
Use Efficiency ◽  
Distribution Uniformity

Increasing water use efficiency in agricultural systems is critical as it results in economic and environmental cost reductions, especially in localized irrigation, which depends on a number of factors, especially the flow rate of the emitters and proper uniformity of water distribution, both with respect to direct with the pressure of the emitters For this evaluation the use of coefficients of water uniformity, it is essential to indicate the best wetness management. The experiment was carried out in the Irrigation laboratory, in a test stand, using Christiansen uniformity coefficient - CUC, distribution uniformity coefficient - CUD and statistical uniformity coefficient - CUE. In the irrigation line, four pressures on the drip emitter (5, 10, 15 and 20 mca) were applied. The pressure variations obtained did not reduce the efficiency of the uniformity of water distribution by the drip system, falling into high efficiency ranges for all evaluated coefficients, representing adequate wetting rates.

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 DESEMPENHO DE GOTEJADORES OPERANDO COM ÁGUA RESIDUÁRIA DE LATICÍNIOS EM ESCALA LABORATORIAL

Irriga ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 140 ◽  
Author(s):  
Blake Charles Diniz Marques ◽  
Vanessa Tainara da Cunha ◽  
Valéria Tatiany da Cunha ◽  
Ketson Bruno da Silva ◽  
Rafael Oliveira Batista
Keyword(s):  
Flow Rate ◽  
Operating Time ◽  
Dairy Wastewater ◽  
Semiarid Region ◽  
Uniformity Coefficient ◽  
Microbiological Characteristics ◽  
Wastewater Quality ◽  
Distribution Uniformity ◽  
Experimental Trials ◽  
Iron Manganese

DESEMPENHO DE GOTEJADORES OPERANDO COM ÁGUA RESIDUÁRIA DE LATICÍNIOS EM ESCALA LABORATORIAL  BLAKE CHARLES DINIZ MARQUES1; VANESSA TAINARA DA CUNHA1; VALÉRIA TATIANY DA CUNHA1; KETSON BRUNO DA SILVA1; RAFAEL OLIVEIRA BATISTA1 1 Departamento de Ciências Ambientais e Tecnológicas, UFERSA câmpus Mossoró-RN, Avenida Francisco Mota, no 572, Bairro Costa e Silva, CEP: 59.625-900 - Mossoró, RN, Brasil. E-mail: [email protected], [email protected], [email protected], [email protected], [email protected]  1 RESUMO A degradação ambiental e a escassez hídrica no semiárido são fatores que contribuem para utilização de águas residuárias na agricultura. A irrigação localizada torna-se o método mais adequado para este fim, devido ao uso eficiente da água. Neste contexto, o presente trabalho teve por objetivo monitorar a vazão e o coeficiente de uniformidade de distribuição (CUD) em unidades de irrigação, dotadas de cinco tipos de gotejadores (G1 = 1,6 L h-1, G2 = 2,0 L h-1, G3 = 2,0 L h-1, G4 = 1,70 L h-1 e G5 = 2,0 L h-1) aplicando água residuária de laticínios; e avaliar as características físico-químicas e microbiológica do efluente, quanto ao risco de obstrução. O monitoramento da qualidade da água residuária de laticínios foi realizado a cada 40 h, simultaneamente com a determinação da vazão dos gotejadores e do CUD, totalizando seis amostragens, até o encerramento dos ensaios experimentais, no tempo de operação de 200 h. O gotejador G2 foi o mais suscetível ao entupimento com efluente de laticínios tratado, enquanto o gotejador G5 foi o mais resistente ao entupimento. As características sólidos suspensos, sólidos dissolvidos, ferro, manganês, cálcio e a presença de microrganismos, interferiram, diretamente nos valores da vazão dos gotejadores e do CUD das unidades de irrigação que operaram com efluente de laticínios tratado. Palavras-chave: emissores, efluente, obstrução.  MARQUES, B. C. D.; CUNHA, V. T.; CUNHA, V. T.; SILVA, K. B.; BATISTA, R. O.DRIPPERS PERFORMANCE OPERATING WITH DAIRY WASTEWATER IN LABORATORY SCALE  2 ABSTRACT Environmental degradation and water scarcity in the semiarid region are factors that contribute to the use of wastewater in agriculture. This study aimed to monitor the flow rate and the distribution uniformity coefficient (CUD) of irrigation units in five types of drippers (G1 = 1.6 L h-1, G2 = 2.0 L h-1, G3 = 2.0 L h-1, G4 = 1.70 L h-1 and G5 = 2.0 L h-1) applying wastewater dairy, as well as the physicochemical and microbiological characteristics of the effluent, that represented risk of obstruction. Monitoring of the dairy wastewater quality was performed every 40 h, simultaneously with the determination of the emitter flow rate and CUD, totaling six samples until the end of the experimental trials, in 200 h of operating time. The dripper G2 was the most susceptible to clogging with treated dairy wastewater, while the drip G5 was the most resistant to clogging. Solid suspended, dissolved solids, iron, manganese, calcium and presence of microorganisms interfered directly on flow rate and CUD of irrigation units that operated with treated dairy effluent. Keywords: emitters, effluent, clogging. 

scholarly journals Pressure compensating microsprinklers using microtube as a flow controller

2016 ◽  
Vol 36 (1) ◽  
pp. 36-45
Author(s):  
Alexsandro C. dos Santos Almeida ◽  
Ceres D. G. C. de Almeida ◽  
Tarlei A. Botrel ◽  
José A. Frizzone
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Lateral Line ◽  
Water Distribution ◽  
Pressure Head ◽  
Pressure Variation ◽  
Rate Variation ◽  
Flow Uniformity ◽  
Random Manner ◽  
Distribution Uniformity

ABSTRACT Microsprinkler non-pressure compensating nozzles usually show water flow variation along the lateral line. This study aimed at adapting microtubes into non-compensating system of microsprinklers previous installed in the field, as a self-compensated nozzle, to improve the flow uniformity along the lateral line. Microtubes were adapted to three types of commercial microsprinklers. Tests were conducted, both in the laboratory and in field, to evaluate the microsprinkler performance at four different flows (40, 50, 60 and 70 L h-1) under pressure head range from 75 to 245 kPa. Nozzles presented coefficient of flow-rate variation (CVq) lower than 5.5% and distribution uniformity (DU) greater than 95%, which are classified as excellent. The original spatial water distribution of the microsprinkler did not change by using microtube as a nozzle. This device adapted to non-pressure compensating microsprinklers are functional and operate effectively with flows ranging up to 70 L h-1. Small variations at microsprinkler flows along the lateral line can occur, however, at random manner, which is common for pressure-compensating nozzles. Therefore, the microtube technique is able to control pressure variation in microsprinklers.

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.

scholarly journals Determining the deficit coefficient as a function of irrigation depth and distribution uniformity

2010 ◽  
Vol 14 (3) ◽  
pp. 253-260 ◽  
Author(s):  
Everardo C. Mantovani ◽  
Gregório G. Faccioli ◽  
Brauliro G. Leal ◽  
Luis C. Costa ◽  
Antônio A. Soares ◽  
...  
Keyword(s):  
Normal Distribution ◽  
Water Deficit ◽  
Water Distribution ◽  
Distribution Model ◽  
Applied Water ◽  
Uniformity Coefficient ◽  
Production Values ◽  
Irrigation Depth ◽  
Distribution Uniformity ◽  
Bean Crop

The present study aimed at the development of the water deficit coefficient as a function of the Christiansen uniformity coefficient and relationship between the applied water depth and that required by a given crop, taking into account that the water distribution by the sprinkler follows a normal distribution. Another objective was to compare the experimental results to those obtained through simulation with the Mantovani model. For this, the water deficit coefficients developed in this work were used, as well as the simplified coefficient that takes into account the water distribution by the sprinkler following a uniform distribution, and finally the development of the production functions for the bean crop by using the Mantovani model. The production values simulated by the model, using the normal deficit coefficient, were always less than those simulated with the uniform deficit coefficient for all uniformity levels and all values of the crop's maximum evapotranspiration fraction restored by other sources (p). Under the conditions that this study was carried out, the use of the water deficit coefficient based on the normal distribution model did not provide a better performance of the simulation model proposed by Mantovani.

scholarly journals PRESSÕES DE SERVIÇOS E SEUS EFEITOS NO DESEMPENHO DE UM SISTEMA DE IRRIGAÇÃO POR GOTEJAMENTO

Irriga ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 14-18
Author(s):  
Taiane de Almeida Pereira ◽  
Alexandre Reuber Almeida da Silva ◽  
Marcos Makeison Moreira de Sousa ◽  
Cristian De França Santos ◽  
Daniel Lima dos Santos
Keyword(s):  
Drip Irrigation ◽  
Water Distribution ◽  
Irrigation System ◽  
Drip Irrigation System ◽  
Mean Values ◽  
Uniformity Coefficient ◽  
Lateral Lines ◽  
Distribution Uniformity ◽  
Water Volumes ◽  
Micro Irrigation

PRESSÕES DE SERVIÇOS E SEUS EFEITOS NO DESEMPENHO DE UM SISTEMA DE IRRIGAÇÃO POR GOTEJAMENTO     TAIANE DE ALMEIDA PEREIRA1; ALEXANDRE REUBER ALMEIDA DA SILVA2; MARCOS MAKEISON MOREIRA DE SOUSA3; CRISTIAN DE FRANÇA SANTOS1 E DANIEL LIMA DOS SANTOS1   1Graduandos em Tecnologia em Irrigação e Drenagem, Instituto Federal de Educação Ciência e Tecnologia do Ceará – campus Iguatu, Rodovia Iguatu/Várzea Alegre, Km 05 – Vila Cajazeiras – Iguatu-CE. CEP: 63.503-790; taianeirrigacao@gmail; [email protected]; [email protected]; 2Professores do Curso de Tecnologia em Irrigação e Drenagem, Instituto Federal de Educação Ciência e Tecnologia do Ceará – campus Iguatu, Rodovia Iguatu/Várzea Alegre, Km 05 – Vila Cajazeiras – Iguatu-CE. CEP: 63.503-790, [email protected]; 3Mestrando em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará – campus do Pici, Centro de Ciências Agrárias – CCA/UFC, Bloco 804, Fortaleza CE, CEP: 60.455-760; [email protected].     1 RESUMO   O presente trabalho teve como objetivo analisar a uniformidade de distribuição de em um sistema de irrigação localizada, do tipo gotejamento operando em condições de campo sob diferentes pressões de serviços, por meio da determinação dos Coeficiente de Uniformidade de Christiansen (CUC), do Coeficiente de Uniformidade de Distribuição (CUD) e do Coeficiente de Uniformidade Estatística (Us). Em campo, foram utilizadas 4 linhas laterais escolhidas ao acaso e com o auxílio de proveta e cronômetro, foram aferidos os volumes de água em 4 gotejadores de parede delgada, em três repetição em um tempo de 60 segundos, observando as 3 diferentes pressões de serviço (5,1; 10,2 e 15,3 mca). A média dos valores encontrados para o Coeficiente de Uniformidade de Christiansen (CUC), Coeficiente de Uniformidade de Distribuição (CUD) e o Coeficiente de Uniformidade Estatística (Us) são considerados pela literatura especializada como excelentes.  Todavia, na pressão de serviço de 5,1 mca, a uniformidade de distribuição de água tende a ser comprometida. Infere-se, portanto, que o sistema de irrigação está bem dimensionado evitando assim danos financeiros, independente das pressões de serviços nas quais o mesmo esteja operando.   Palavras-Chave: uniformidade, microirrigação, alturas manométricas.     PEREIRA, T. DE A.; SILVA, A. R. A. DA; SOUSA, M. M. M. DE; SANTOS, C. DE F.; SANTOS, D. L. DOS SERVICE PRESSURES AND THEIR EFFECTS ON THE PERFORMANCE OF A DRIP IRRIGATION SYSTEM     2 ABSTRACT   The objective of this work was to analyze the distribution uniformity of a drip irrigation system located in field conditions under different service pressures, through the determination of the Coefficient of Uniformity of Christiansen (CUC), Coefficient of Distribution Uniformity (CUD) and Statistical Uniformity Coefficient (Us). In the field, 4 randomly selected lateral lines were used and with the aid of a beaker and stop watch, the water volumes were measured in 4 thin-walled drippers in three repetitions in a time of 60 seconds, observing the 3 different service pressures (5.1, 10.2 and 15.3 microns). The mean values found for the Christiansen Uniformity Coefficient (CUC), Uniform Distribution Coefficient (CUD) and the Statistical Uniformity Coefficient (Us) are considered by the specialized literature to be excellent. However, in the service pressure of 5.1 mca, the uniformity of water distribution tends to be compromised. It is inferred, therefore, that the irrigation system is well-sized working, thus avoiding financial damages, regardless of the pressures of services in which it is operating.   Keywords: uniformity, micro-irrigation, manometric heights.

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 Spatial variability of available water and micro-sprinkler irrigation in cambisol

Revista CERES ◽  
2016 ◽  
Vol 63 (6) ◽  
pp. 782-788
Author(s):  
Larissa Luana Nicodemos Ferreira ◽  
Luis César de Aquino Lemos Filho ◽  
Marcílio Macêdo Torres ◽  
Raimundo Fernandes de Oliveira Júnior ◽  
Clara Nívea Costa do Vale ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Flow Rate ◽  
Sprinkler Irrigation ◽  
Sprinkler System ◽  
Water Application ◽  
Uniformity Coefficient ◽  
Water Capacity ◽  
Available Water ◽  
Available Water Capacity ◽  
Distribution Uniformity

ABSTRACT The technology of irrigation is vital for agricultural production. Thus, description of spatial patterns of both water application and available water capacity in the soil, as well as their interactions, is essential to maximize efficiency of water use in irrigated areas. The objective of this study was to analyze spatial variability of available water capacity in the soil and water application via irrigation using geostatistics. The experiment was conducted in a commercial mango orchard in Cambisol irrigated by micro sprinkler system, in the municipality of Alto do Rodrigues, RN. Analyses of descriptive statistics and geostatistics were performed using the programs GeoR and GS+. Geostatistics was found suitable for describing the structure of spatial dependence of available water capacity in the soil and the flow rate distributed in the area by sprinklers. Moreover, even with good results for Christiansen Uniformity Coefficient (CU) and Distribution Uniformity Coefficient (DU), the area showed spatial variability of flow rate.

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