drip irrigation emitter
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2019 ◽  
Vol 212 ◽  
pp. 136-154 ◽  
Author(s):  
Siqi Han ◽  
Yunkai Li ◽  
Bo Zhou ◽  
Zeyuan Liu ◽  
Ji Feng ◽  
...  

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 38
Author(s):  
Ronaldo Souza Resende ◽  
Anny Karolini Menezes Rodrigues ◽  
Julio Roberto Araujo de Amorim ◽  
Luciano Alves de Jesus Júnior

INTENSIDADE DA INTRUSÃO DE RAÍZES DE CANA-DE-AÇÚCAR EM GOTEJADORES SOB DIFERENTES MANEJOS DA IRRIGAÇÃO  RONALDO SOUZA RESENDE1; ANNY KAROLINI MENEZES RODRIGUES2; JULIO ROBERTO ARAUJO DE AMORIM3 E LUCIANO ALVES DE JESUS JUNIOR4 1Engenheiro Agrônomo, Dr. em Agronomia, Pesquisador, Embrapa Tabuleiros Costeiros, Av. Beira Mar, 3250, Jardins, CEP 49025-240, Aracaju, SE, Brasil. e-mail: [email protected] Agrônoma, Rua Nossa Senhora das Mercedes, 867, São Paulo – SP, Cep 04165-001, Email [email protected] Agrônomo, M. Sc. em Irrigação e Drenagem, Pesquisador, Embrapa Tabuleiros Costeiros, Av. Beira Mar, 3250, Jardins, CEP 49025-240, Aracaju, SE, Brasil. e-mail: [email protected]ístico, Especialista em Estatística, Analista, Embrapa Tabuleiros Costeiros, Av. Beira Mar, 3250, Jardins, CEP 49025-240, Aracaju, SE, Brasil. e-mail: [email protected].  1 RESUMO O objetivo deste estudo foi quantificar o intrusionamento das raízes no interior dos gotejadores em função de diferentes níveis de irrigação da cana-de-açúcar e de profundidades de instalação do tubogotejador. Foram avaliadas linhas laterais de irrigação utilizadas durante quatro ciclos de cultivo (2008 a 2011), instaladas em duas profundidades: P1 = 0,25 m e P2 = 0,35 m, em quatro níveis de reposição da demanda evapotranspirativa: W1 = 45%, W2 = 90%, W3 = 135% e W4 = 180% da ETo. Após realização de testes de vazão, os gotejadores de uma amostra de cada tratamento foram dissecados para avaliação da presença e distribuição das raízes no seu interior. Os dados de contagem dos gotejadores com presença de raiz foram submetidos ao teste não paramétrico de Friedman. O tratamento W3 (135% da ETo) resultou em menor nível de intrusão na profundidade P1 (0,25 cm), porém foi o que apresentou maior nível em P2 (0,35 cm). Os resultados obtidos não evidenciaram claramente uma relação entre o manejo da umidade do solo na zona radicular e a ocorrência da intrusão de raízes no orifício de gotejadores. Observou-se a presença de raízes em 65% dos gotejadores, sobretudo localizadas na câmera de saída de água e no labirinto do gotejador. Palavras-chave: Saccharum spp., gotejamento subsuperficial, entupimento de gotejadores, estrutura do gotejador.  RESENDE, R. S.; RODRIGUES, A. K. M.; AMORIM, J. R. A. de; JESUS JUNIOR, L. A. deINTENSITY OF SUGARCANE ROOT INTRUSION IN DRIPPERS UNDER DIFFERENT IRRIGATION MANAGEMENTS  2 ABSTRACT This study aimed to quantify the root intrusion inside the drippers due to different levels of irrigation and depths of drip side lines installation. For this purpose, the drip side lines used in the four cycles of sugarcane crop (2008-2011) were evaluated. The side lines were installed at 0.25 m and 0.35 m depth. Sugarcane was submitted to four water replacement levels of the reference crop evapotranspiration (ETo) demand: W1 = 45%, 90% = W2, W3 = W4 = 135% and 180% of ETo. After performing flow tests, emitters from a sample of each treatment were dissected for evaluation of the presence and distribution of the roots within them. The count data of drippers with the presence of roots were submitted to the nonparametric Friedman test. W3 Treatment (135% of ETo) resulted in the lowest level of root intrusion at depth P1 (0.25 cm), but it had the highest level of intrusion at depth P2 (0.35 cm). The results showed an unclear relationship between the management of soil moisture in the root zone of sugarcane and the occurrence of root intrusion into the orifice of drip emitters. The presence of roots was observed in 65% of the evaluated drippers, mainly located inside the water output camera and dripper labyrinth channel. Keywords: subsurface drip irrigation, emitter clogging, irrigation management.


PLoS ONE ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. e0175241 ◽  
Author(s):  
Pulkit Shamshery ◽  
Ruo-Qian Wang ◽  
Davis V. Tran ◽  
Amos G. Winter V

Author(s):  
Pulkit Shamshery ◽  
Amos G. Winter

This work discusses the modeling and optimization of a drip irrigation emitter for reducing activation pressure. Our model formulation focuses on analytically characterizing fluid-structure interactions in an existing 8 liters per hour (lph) pressure-compensating online emitter. A preliminary experimental validation of the resulting model was performed for three different emitter architectures. This model was used as a basis for a genetic algorithm-based optimization algorithm that focused on minimizing activation pressure. The design variables considered in our formulation include, geometric features of the emitter architecture, and practical constraints from manufacturing. We applied our optimization approach to four emitters (with flow rates of 4, 6, 7 and 8.2 lph) and were able to lower activation pressure by more than half in each case. The optimization results for all four emitters were experimentally validated in lab-studies. We performed a more exhaustive validation study for the 8.2 lph emitter with an emitter manufacturer. Results from these experiments (which followed ISO standards) showed that the optimized 8.2 lph emitter had a 75% lower activation pressure when compared to the original emitter design.


2015 ◽  
Vol 34 (4) ◽  
pp. 898 ◽  
Author(s):  
A Sobowale ◽  
AM Omotayo ◽  
JO Olobashola ◽  
P Abdulsalaam-sagir ◽  
K Elemo ◽  
...  

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