Página 1 dos resultados de 1943 itens digitais encontrados em 0.010 segundos

Definição do posicionamento de sensores para monitoramento da água no solo em bananeira irrigada por diferentes sistemas de irrigação localizada; Sensor placement for soil water monitoring in banana crop irrigated by drip irrigation systens

COELHO, Eugênio F.; SILVA, Alisson J. P. Da; MIRANDA, Jarbas H. De
Fonte: Associação Brasileira de Engenharia Agrícola Publicador: Associação Brasileira de Engenharia Agrícola
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
56.26%
O uso eficiente da água na irrigação localizada dependerá, além de outros fatores, também do correto monitoramento da água no solo. Portanto, este trabalho teve como objetivo caracterizar as zonas efetivas de comprimento de raízes e de extração de água, bem como indicar o correto posicionamento de sensores de água no solo para o manejo da irrigação por gotejamento na bananeira em fase de produção. No experimento, conduzido na Embrapa Mandioca e Fruticultura Tropical, foram estudados diferentes sistemas de irrigação localizada, diante dos seguintes tratamentos: T1 - dois emissores de 4 L h-1 por planta em uma lateral por fileira de plantas; T2 - quatro emissores de 4 L h-1 por planta em uma lateral por fileira de plantas; T3 - cinco emissores de 4 L h-1 por planta em faixa contínua com uma lateral por fileira. Pelos resultados obtidos, pode-se observar que as regiões mais adequadas para a instalação de sensores de umidade no solo nos tratamentos T1, T2 e T3 são as limitadas pelas distâncias e profundidades de 0,2 m e 0,4 m; 0,5 m e 0,35 m; 0,55 m e 0,35 m, respectivamente.; The efficient use of water for drip irrigation will depend, among other factors, the correct monitoring of water in the soil profile. This work aimed to characterize root zones of effective root length and effective root water uptake and also to indicate the correct sensors location in the soil profile for drip irrigation management in banana crop during the production stage of the first cycle. The experiment was carried out at the Embrapa Cassava & Tropical Fruits...

Impacto da irrigação na bacia hidrográfica do ribeirão dos Marins; Impact of irrigation at the Marins stream watershed

Lucas, Ariovaldo Antonio Tadeu
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 17/09/2007 PT
Relevância na Pesquisa
56.4%
Atualmente a água é o recurso mais limitante para o desenvolvimento urbano, industrial e principalmente agrícola devido à constante contaminação em função da falta de planejamento e uso inadequado dos recursos hídricos pela humanidade. Assim o presente trabalho teve o objetivo de estudar o impacto ambiental da irrigação nos recursos hídricos da microbacia hidrográfica do ribeirão dos Marins e testar a capacidade do modelo hidrológico MIKE SHE em pequenas áreas irrigadas da microbacia e conseqüentemente detectar problemas relacionados à irrigação e a falta de manejo da água nessas áreas. Avaliou-se a qualidade da água de irrigação utilizada na produção de hortaliças; a qualidade da irrigação praticada pelos produtores, a quantidade de água na microbacia hidrográfica e simulou-se a área irrigada da microbacia. Os parâmetros de qualidade de água analisados foram: sedimentos em suspensão, pH, condutividade elétrica, alcalinidade, turbidez, potássio, cálcio, magnésio, cobre, ferro, manganês, zinco, sódio, fósforo, sulfato, cloreto, nitrogênio amoniacal e nitrato, durante 10 meses. A qualidade da irrigação foi avaliada através do manejo da irrigação via tensiômetros, instalados em duas propriedades agrícolas e em duas profundidades...

Automação da leitura do medidor Speedy e utilização em programa de manejo de irrigação; Automation of the reading of a Speedy moisture tester and use in irrigation management software

Garzella, Tiago Cappello
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 12/04/2011 PT
Relevância na Pesquisa
66.21%
No contexto atual, no qual os recursos hídricos tornam-se cada vez mais limitantes, a utilização da água pela agricultura precisa ser mais eficiente visando à manutenção dos níveis atuais de produtividade. Uma vez implantado o equipamento de irrigação, o produtor necessita de uma estratégia de gerenciamento que defina o momento certo e a quantidade de água adequada para atender às necessidades hídricas da cultura. Uma ferramenta muito utilizada para esse fim é o balanço hídrico, pelo qual são contabilizadas as entradas e saídas de água do sistema, permitindo que se obtenha a quantidade a ser aplicada visando à utilização racional do recurso e o desenvolvimento adequado da cultura. Entretanto, muitas vezes o acompanhamento da quantidade de água disponível às plantas somente pelo balanço hídrico pode apresentar erros cumulativos, o que torna importante, a cada determinado intervalo de tempo, realizar-se medições da umidade do solo para fins de ajuste. O medidor Speedy, baseado no processo de formação do gás acetileno a partir da reação da água com carbureto de cálcio, pode ser utilizado de forma conjugada ao balanço hídrico por fornecer resultados rápidos com adequada precisão, ser portátil e de fácil manuseio. Assim...

Irrigation management in pruned coffee tree crop

Custódio, Anselmo A.de P.; Faria, Manoel A. de; Rezende, Fátima C.; Morais, Augusto R. de; Leite Junior, Maurício C.R.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 55-63
ENG
Relevância na Pesquisa
56.44%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); It was evaluated the effect of irrigation management on the production characteristics of coffee cultivar Acaiá MG-1474, planted in spacing of 3.00 m x 0.60 m, pruned in 2004, and irrigated by drip since the planting, in 1997. The experimental designed used was of randomized blocks with five treatments and four replications. The treatments consisted of irrigation management strategies, applying or not applying controlled moisture deficit in layer of 0 to 0.4m, in dry seasons of the year: A = no irrigation (control), B = irrigation during all year considering the factor of water availability in the soil (f) equal to 0.75, C = irrigation during all year considering f = 0.25, D = irrigation during all year, but in January / February / March / July / October / November / December with f = 0.25 and April / May / June / August / September with f = 0.75, E = irrigation only during April / May / June / August / September with f = 0.25. From July / 2005 to June / 2007 the applied water depth was defined based on Class A pan evaporation (ECA) and the period from July/2007 to June/2008 based on readings of matric potential of soil obtained from Watermark® sensors. Each plot consisted of three rows with ten plants per row...

Quality and maximum profit of industrial tomato as affected by distribution uniformity of drip irrigation system

Santos, Francisco Lúcio
Fonte: Irrigation and Drainage Systems Publicador: Irrigation and Drainage Systems
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.35%
Abstract The tomato industry reformed its system of payment by weight of tomato, introducing a corrective system based on percent level of fruit dry matter produced. Such a decision implies significant changes in the management of irrigation systems, with a need to emphasize the technological quality of the marketable product. Three levels of distribution uniformity of the irrigation system are analysed, and related production functions of crop yield and percent of dry matter are presented as well as their use on the optimisation of dry matter, expected revenues and seasonal applied water. Results are critically influenced by the distribution uniformity. They demonstrate the inter-relationship between crop production, percent fruit dry matter and irrigation management, and the importance of considering non-uniformity in the economic analysis of industrial tomato production. Decreases in uniformity lead to a reduction in dry matter production per unit land. Decreases in dry matter are also observed with increasing levels of seasonally applied water, with the optimal level always lower than the required for maximum yield. Such interaction suggests a continuous and inverse relationship between profit and water applied. However, due to the corrective system of payment...

Irrigation management in pruned coffee tree crop

Custódio,Anselmo A. de P.; Faria,Manoel A. de; Rezende,Fátima C.; Morais,Augusto R. de; Leite Junior,Maurício C. R.
Fonte: Associação Brasileira de Engenharia Agrícola Publicador: Associação Brasileira de Engenharia Agrícola
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2013 EN
Relevância na Pesquisa
56.44%
It was evaluated the effect of irrigation management on the production characteristics of coffee cultivar Acaiá MG-1474, planted in spacing of 3.00 m x 0.60 m, pruned in 2004, and irrigated by drip since the planting, in 1997. The experimental designed used was of randomized blocks with five treatments and four replications. The treatments consisted of irrigation management strategies, applying or not applying controlled moisture deficit in layer of 0 to 0.4m, in dry seasons of the year: A = no irrigation (control), B = irrigation during all year considering the factor of water availability in the soil (f) equal to 0.75, C = irrigation during all year considering f = 0.25, D = irrigation during all year, but in January /February /March /July /October /November /December with f = 0.25 and April /May /June /August /September with f = 0.75, E = irrigation only during April /May /June /August /September with f = 0.25. From July /2005 to June /2007 the applied water depth was defined based on Class A pan evaporation (ECA) and the period from July/2007 to June/2008 based on readings of matric potential of soil obtained from Watermark® sensors. Each plot consisted of three rows with ten plants per row, considering as useful plot five plants of center line. The results indicated that the E irrigation management was the most suitable for technical reasons.

Technical and economic analysis of irrigation of asparagus bean in protected environment

Silva,Wellington G.; Carvalho,Jacinto A.; Oliveira,Eduardo C.; Lima Júnior,Joaquim A.; Silva,Buno M.
Fonte: Associação Brasileira de Engenharia Agrícola Publicador: Associação Brasileira de Engenharia Agrícola
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2013 EN
Relevância na Pesquisa
56.26%
This experiment was conducted in Lavras - state of Minas Gerais (MG), Brazil, in a protected environment, and aims to estimate the irrigation depths that maximize productivity and economic returns in the cultivation of asparagus bean and analyze the economic viability of irrigation management. The experimental delineation was randomized blocks with five treatments and four replications. The treatments consisted of five drip irrigation depths: 40, 70, 100, 130 and 160% of water replacement depth up to field capacity. The depths of water that maximize productivity and economic returns were obtained from the regression model adjusted to productivity data, cost of product relations and water cost. The economic viability was achieved on the benefit/cost ratio basis. The depth with the maximum economic return was estimated in 434.4mm, with a productivity of 35,160.6kg ha-1, which is economically viable for the cultivation of asparagus bean, with a expected profitability of R$ 1.70 for every real invested.

Sistemas de irriga????o e manejo de ??gua na produ????o de sementes; Irrigation systems and water management for seed production

TAVARES, Vitor Emanuel Quevedo
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
56.48%
High quality seed production, in na economically feasible way, demands for appropriate use of the available production technologies, like irrigation, wich is often considered as a guaranteed way to improve and ensure yield. However, many factors contribute for not reaching the full economic results this technique allows for. Among these factors are inadequate system choice, design and operation and inappropriate water management related to climate, soil and plant characteristics. When irrigation is applied to seed production fields, the lack in considering the specific plant needs for high quality seed production is another failure factor to be added. For many crops, including soybean, corn, cotton and bean, the sprinkler irrigation use, mainly automated systems, is increasing, this fact, combined with the economic significance of these crops for seed market, is putting pressure on the need for making better use of these systems. This text presents a set of technical directions intended for assiting personnel, students and researchers involved with high quality seed production oriented irrigation. The first section is addressed to the context were irrigation is inserted, mainly related to the seed production aspect. In the second section the concepts related to the air-water-soil-plant system are treated. The third section is dedicated to the crop water requirements and irrigation management...

Aspectos de seguran??a h??drica em sistemas familiares de produ????o de morango sob irriga????o em Turu??u- RS.; Aspects of water security in family production systems of strawberry under irrigation in Turu??u-RS(Brazil)

FRAGA, Rosim??ri da Silva
Fonte: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR Publicador: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
56.38%
The strawberry cultivation has been among the main features in family production systems in Turu??u-RS (Brazil), being produced and sold both fresh as well as in the processed form, allowing to the farmers employment generation, income and social inclusion. The strawberry production system, in general, is characterized by the use of soil cover with black color plastic, the use of low tunnels and drip irrigation systems with the fertilizer application through irrigation water (fertigation). The importance and benefits of irrigation for strawberry production have been found by farmers, as it has allowed the improvement of fresh fruits quality. However, as strawberry fields were mostly located far from major water sources, many farmers need to build dams to impound water efficiently, to assure the success of the irrigation for crops, and also to ensure the quality and quantity of water for these activities. Based on this, this study aimed to evaluate: i. spatial and temporal behavior of physical and hydraulic properties of soils in the 0-200 mm layer (available water capacity and water storage) related to irrigation management adopted in 12 crops of strawberry, ii. geotechnical and safety characteristics of two small earth dams used to store water for irrigation of strawberries and other crops...

Reengaging in Agricultural Water Management: Challenges and Options

World Bank
Fonte: Washington, DC: World Bank Publicador: Washington, DC: World Bank
EN_US
Relevância na Pesquisa
46.61%
The overall goal of this report is to give strategic focus to implementation of the agricultural water management (AWM) components of the corporate strategies. Its specific objectives are to set out the changing context of demand and supply for agricultural water; to identify the policy, institutional, and incentive reform options that will accelerate productivity improvements and pro-poor growth; and to articulate priorities for investment in AWM. It is also intended to define the role of the public sector and other stakeholders, and to set out how AWM can be best integrated upstream into water resources management, and downstream as an input provider into the agricultural economy.

Yield Impact of Irrigation Management Transfer : Story from the Philippines

Bandyopadhyay, Sushenjit; Shyamsundar, Priya; Xei, Mei
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Relevância na Pesquisa
66.62%
Irrigation management transfer is an important strategy among donors and governments to strengthen farmer control over water and irrigation infrastructure. This study seeks to understand whether irrigation management transfer is meeting the promise of its commitments. The authors use data from a survey of 68 irrigator associations and 1,020 farm households in the Philippines to estimate the impact of irrigation management transfer on irrigation association performance and on rice yields. They also estimate a stochastic frontier production function to assess contributions to technical efficiency. There are three main results. First, the presence of irrigation management transfer is associated with an increase in maintenance activities undertaken by irrigation associations. Second, by increasing local control over water delivery, the presence of irrigation management transfer is associated with a 2-6 percent increase in farm yields. Rice production in irrigation management transfer areas is greater even after controlling for various differences among rice farmers in transfer and non-transfer areas. Third...

Enhancing the Role of Women in Water User Associations in Azerbaijan

Merkle, R.; Meerbach, D.; Akhmedova, A.; Bagirzadeh, M.; Dideron, S.; Javazadeh, L.; Rustamova, S.
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
Relevância na Pesquisa
46.59%
The purpose of this report on enhancing the role of women in water user associations in Azerbaijan is to provide guidance for mainstreaming gender in irrigation management projects in Azerbaijan and in the wider Caucasus and Central Asian regions in order to foster efficient and equitable development in irrigation management. The paper is divided in three chapters. Chapter one sets the background relating the themes of gender to water users associations (WUAs) and irrigation agriculture. It provides both the general sector background as well as an introduction of the overall study and research that was undertaken at the end of Irrigation Distribution System and Management Improvement Project (IDSMIP). Chapter two provides the informative basis for enhancing the role of women in irrigation management. It analyses and discusses the role of men and women in irrigation agriculture in Azerbaijan by synthesizing the findings of the gender survey. Chapter three provides lessons for WUAs in Azerbaijan on how to promote gender equity and for World Bank projects on how to operationalize gender mainstreaming in irrigation agriculture in the country. It also provides guidance in establishing an enabling environment that will foster gender equity in similar irrigation sector programs in the wider Caucasus and Central Asian region.

The manipulation of grapevine leaf gas exchange through irrigation management

Loveys, B.; Soar, C.; Stoll, M.; Mccarthy, M.; Dry, P.
Fonte: Wine Publishers Pty Ltd Publicador: Wine Publishers Pty Ltd
Tipo: Artigo de Revista Científica
Publicado em //2002 EN
Relevância na Pesquisa
56.26%
During the past ten years the Australian winegrape industry has experienced a period of massive expansion fuelled by demand for high quality, reasonably priced wines in world markets. Since 1987 the area planted to grapevines has increased from 60,000ha to the current area of 146,000ha. This expansion has occurred in a climate of decreasing availability of water for irrigation and an increase in its cost. There is therefore considerable pressure on the winegrape industry to increase its efficiency of water use. Grapevines retain tight control over stomatal conductance, which is very responsive to relatively small reductions in soil water availability. We have been able to exploit this responsiveness in developing a novel irrigation strategy which increases the efficiency of water use by inducing partial stomatal closure while retaining sufficient assimilation capacity to maintain the yield potential of the vine. The strategy requires that roots are simultaneously exposed to wet and dry soil. Changes in root and shoot abscisic acid (ABA) suggests that ABA, produced in the drying roots, is primarily responsible for reduced stomatal conductance. The effects of this partial root drying on leaf gas exchange and on the transport of ABA from root to shoot can be reproduced by exogenous application of a low concentration of ABA to part of the root system. Furthermore...

Water User Association Development in China : Participatory Management Practice under Bank-Supported Projects and Beyond

Lin, Zong-cheng
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Brief; Publications & Research
ENGLISH
Relevância na Pesquisa
56.54%
Irrigation is crucial to China's agricultural productivity. This report reviews the history of water irrigation in China. It examines the first Bank supported water project to propose both physical rehabilitation and management reform. Local and international experience has shown that participatory irrigation management by farmers (PIM) contribute to institutional improvement. The report looks at self-financing irrigation and drainage districts, or SIDDs which have two main parts: a water-supply corporation (WSC) and water user associations (WUA).

Empowering Women in Irrigation Management : The Sierra in Peru

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Publications & Research :: Working Paper; Publications & Research
ENGLISH; EN_US
Relevância na Pesquisa
56.37%
This report tells the story of a gender pilot that was carried out in water users' organizations for irrigated agriculture in the Peruvian highlands or Sierra region. It was designed upon the request of Peru's ministry of agriculture, with the objective to strengthen the role of women in water management and to improve their condition as agricultural producers. At first, a gender diagnostic was carried out to better understand the different barriers that hinder the attendance and thus equality of participation of women in trainings and meetings. After this diagnostic, a discussion followed about the importance for a community of including women in water management. In response to these diagnostics and subsequent discussions, the water users resolved to set specific targets for becoming more inclusive organizations, and shaped the content and timing of their activities to allow a greater number of women to participate. The pilot, carried out between 2007 and 2009, improved women s technical skills, self-esteem and position in the water users organizations...

Institutional Reform for Irrigation and Drainage : Proceedings of a World Bank Workshop

Gonzalez, Fernando J.; Salman, Salman M.A.
Fonte: Washington, DC: World Bank Publicador: Washington, DC: World Bank
Tipo: Publications & Research :: Publication; Publications & Research :: Publication
ENGLISH; EN_US
Relevância na Pesquisa
56.53%
The report consists of an introduction, and three separate, but inter-related parts. The introduction provides an overview of the workshop discussions, arguing that the irrigation sector is blamed for many environmental problems, suggesting to set the right incentives, and regulations, including stakeholders involvement, and partnerships to overcome sector obstacles. The first part looks at the institutional diversity in irrigation, and drainage sectors, reviewing institutional changes within components of the Bank's portfolio of irrigation, and drainage projects. It addresses the extent to which the Bank's major policy documents of the 1990s have shaped the portfolio, and suggests recommendations to promote institutional changes, and the introduction of alternative solutions, such as private sector involvement, to increase competition, service contracts, and intergovernmental agreements. The second part reviews the irrigation regulatory framework, arguing that participation of Water Users Associations (WUAs) in the management of irrigation systems...

Emerging Public-Private Partnerships in Irrigation Development and Management

Darghouth, Salah
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Working Paper; Publications & Research
ENGLISH; EN_US
Relevância na Pesquisa
56.58%
The objective of this paper is to identify the possible role and opportunities for the private sector to participate with governments and farmers in developing and managing irrigation and drainage (I&D) infrastructure. Over the last 50 years, irrigated agriculture has been vital to meeting fast-rising food demand and has been key to poverty reduction. In the coming years the strong demographic demand for food is expected to continue, and intensified irrigated agriculture will have to provide close to 60 percent of the extra food. However, in recent years, the pace of irrigation expansion has been slowing, there has been less improvement in productivity, and water availability for irrigation is increasingly constrained. Governments have long led the expansion of large-scale irrigation, but performance has been suboptimal, and reforms that have been introduced have proved slow to improve efficiency and water service. Faced with this challenge, the I&D sector has been wrestling with three deep-seated problems: low water use efficiency...

Water requirement and yield of fig trees under different drip irrigation management

Andrade,Irineu P. de S.; Carvalho,Daniel F. de; Almeida,Wilk S. de; Silva,Jonathas B. Gonçalves; Silva,Leonardo D. B. da
Fonte: Associação Brasileira de Engenharia Agrícola Publicador: Associação Brasileira de Engenharia Agrícola
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2014 EN
Relevância na Pesquisa
56.42%
This work aimed to study the effect of drip irrigation management on growth and yield of the 'Roxo de Valinhos' fig tree (Ficus carica L.), at three years old, and to determine crop coefficients (Kc) and its water requirement (ETc) under Baixada Fluminense climate and soil conditions, state of Rio de Janeiro, Brazil. The study was carried out in the experimental area of SIPA (Sistema Integrado de Produção Agroecológica) in Seropédica, Rio de Janeiro State, from July 2011 to May 2012. The experimental area was divided in two blocks, named B1 (sandy clay loam texture) and B2 (loamy sand texture). In each block, irrigation frequencies (IF) of two (T1) and four days (T2) were evaluated, as well as the irrigation absence (T3). Irrigation management and water consumption determination were performed through the soil water balance, using the TDR technique. Plant growth was not affected by IF, differing only in the number of produced internodes. For both soil textures, the mean Kc was 0.60, with a significant difference (p<0.05) only for IF. The estimated mean yield showed no significant differences between both textural classes, ranging from 6,612 kg ha-1 (T3) to 8,554 kg ha-1 (T1). This study indicates the importance of irrigation frequency in the irrigation management of fig trees cultivated in soils with different physical characteristics.

Distribution of the root system of peach palm under drip irrigation

Lopes,Adriano da Silva; Hernandez,Fernando Braz Tangerino; Alves Júnior,José; Oliveira,Gabriel Queiroz de
Fonte: Editora da Universidade Estadual de Maringá - EDUEM Publicador: Editora da Universidade Estadual de Maringá - EDUEM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
Relevância na Pesquisa
56.47%
The incorporation of technologies has resulted in increased productivity and the more rational management of peach palm, with irrigation being an important tool for certain regions. Thus, studies leading to proper crop management are extremely important, such as the estimate of the effective depth of the root system, which is indispensable for proper irrigation management. The objective of this study was to evaluate the effects of different irrigation depths, as applied by drip irrigation, on the distribution of the root system of peach palm. This experiment was conducted in Ilha Solteira, São Paulo State, Brazil, with drip irrigation, with the two systems (flow of 0.0023 m³ h-1) consisting of four irrigation treatments corresponding to 0, 50, 100 and 150% of Class 'A' pan evaporation. After five years, an analysis of the Bactris gasipaes root system was performed at a distance of 0.0, 0.5 and 1.0 meters from the trunk, collecting sampling at two depths (0.0 to 0.3 m and 0.3 to 0.6 m) via the auger method (volumetric analysis). We concluded that the effective depth of the root system used for irrigation management should be a maximum of 0.3 meters.

Soil water content measured by FDR probes and thresholds for drip irrigation management in peach trees

Hussein-Mounzer,Oussama; Mendoza-Hernández,José Rodolfo; Abrisqueta-Villena,Isabel; Tapia-Vargas,Luis Mario; Abrisqueta-García,José María; Vera-Muñoz,Juan; Ruiz-Sánchez,Mari Carmen
Fonte: Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Publicador: Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2008 EN
Relevância na Pesquisa
56.41%
Soil water content was monitored continuously with multisensor capacitance probes, based on the frequency domain reflectometry (FDR) technique, in drip irrigated young peach trees (Prunus persica (L.) Batsch) cv. Flordastar in a semiarid region of Murcia, Spain during 2004. The aim of this work was to study the effect of two irrigation treatments on volumetric soil water content and to determine the irrigation management thresholds of the soil water store (SWS) as monitored by FDR probes. The treatments consisted in restoring the soil water content to 100% (T1) and 50% (T2) of the crop evapotranspiration (Etc) by applying different irrigation doses with similar frequency. The continuous measurements of soil water content by the capacitance sensors reflected properly the impact of different irrigation events on the soil water stored and provide useful information upon the advance of the wetted front, the depth of the root system activity and the fate of the applied water. Through the continuum soil-plant-atmosphere, the variations of the soil water content were used to determine the in situ: "fullpoint" (142 mm 0.5 m-1), field capacity (132 mm 0.5 m-1), and "refillpoint" (124 mm 0.5 m-1) as practical thresholds for irrigation management to match the irrigation doses and frequency with the actual plant water requirements. Graphical determination of irrigation thresholds minimized the importance of small fluctuations in soil water content. For the early ripening "Flordastar" peach cultivar the reduction of water application down to 50% ETc has lead to a progressive depletion of the soil water storage without a significant effect on final fruit yield and increased water use efficiency from 2.7 kg m-3 in T1 to 5.0 kg m-3 in T2.