An autonomous controller for site-specific management of fixed irrigation systems

Miranda, F. R. de; Yoder, R.; Wilkerson, J. B.; Odhiambo, Lameck O.

doi:10.1016/j.compag.2005.04.003

Cited by 57 publications

(26 citation statements)

References 7 publications

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“…Readers are referred to [13] for a comprehensive review of such systems. Miranda et al [37] described a distributed control system implemented to achieve variable rate water application in a fixed irrigation system operating in predefined management zones. Their results indicated that the system was able to apply the irrigation volume required in each zone.…”

Section: Control Of Water Application In Precision Irrigationmentioning

confidence: 99%

Advanced Monitoring and Management Systems for Improving Sustainability in Precision Irrigation

et al. 2017

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Globally, the irrigation of crops is the largest consumptive user of fresh water. Water scarcity is increasing worldwide, resulting in tighter regulation of its use for agriculture. This necessitates the development of irrigation practices that are more efficient in the use of water but do not compromise crop quality and yield. Precision irrigation already achieves this goal, in part. The goal of precision irrigation is to accurately supply the crop water need in a timely manner and as spatially uniformly as possible. However, to maximize the benefits of precision irrigation, additional technologies need to be enabled and incorporated into agriculture. This paper discusses how incorporating adaptive decision support systems into precision irrigation management will enable significant advances in increasing the efficiency of current irrigation approaches. From the literature review, it is found that precision irrigation can be applied in achieving the environmental goals related to sustainability. The demonstrated economic benefits of precision irrigation in field-scale crop production is however minimal. It is argued that a proper combination of soil, plant and weather sensors providing real-time data to an adaptive decision support system provides an innovative platform for improving sustainability in irrigated agriculture. The review also shows that adaptive decision support systems based on model predictive control are able to adequately account for the time-varying nature of the soil-plant-atmosphere system while considering operational limitations and agronomic objectives in arriving at optimal irrigation decisions. It is concluded that significant improvements in crop yield and water savings can be achieved by incorporating model predictive control into precision irrigation decision support tools. Further improvements in water savings can also be realized by including deficit irrigation as part of the overall irrigation management strategy. Nevertheless, future research is needed for identifying crop response to regulated water deficits, developing improved soil moisture and plant sensors, and developing self-learning crop simulation frameworks that can be applied to evaluate adaptive decision support strategies related to irrigation.

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Section: Control Of Water Application In Precision Irrigationmentioning

confidence: 99%

Advanced Monitoring and Management Systems for Improving Sustainability in Precision Irrigation

et al. 2017

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“…In evaluating an electronic irrigation controller, Miranda et al (2005) considered the performance of a controller satisfactory if the SWT in the root zone was kept less negative than the SWT threshold plus 20% tolerance at least 90% of the time. In the present experiment, the six controllers showed a variation coefficient lower than 20% for most of the evaluation period.…”

Section: Resultsmentioning

confidence: 99%

Irrigation controller mechanically actuated by soil-water tension: II - Field evaluations

Almeida

Botrel

Raine

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TIn this study, a field evaluation of the performance of an irrigation controller mechanically actuated by soil-water tension (SWT) was performed. The controller employs a tensiometer used as a sensor of SWT to directly control a mechanically actuated hydraulic valve. Six controllers were installed in an orchard to control the irrigation for six rows of plants over 64 days. Each controller controlled the irrigation of one lateral drip line. The drip irrigation system was gravity-fed from a water source placed 7 m above the soil surface. The SWT and the pressure in each lateral line were measured to evaluate the performance of the controllers. All the controllers tested in the field autonomously initiated and terminated the irrigation during the evaluation. Irrigation events were initiated when values close to the set soil-tension values were reached and were terminated at lower soil-tension values. As the SWT in the root zone was maintained close to the setup threshold plus 20% tolerance for at least 90% of the evaluation period, the performance of the controllers was considered satisfactory. The proposed controller was shown to be functional and was operated effectively for an SWT range of up to 30 kPa, which is commonly encountered under high-frequency irrigation conditions. Controlador de irrigação mecânico acionado pela tensão da água no solo: II -Avaliações em campo R E S U M O O objetivo deste trabalho foi avaliar, em campo, o desempenho de um controlador de irrigação acionado mecanicamente pela tensão de água no solo. O controlador utiliza um tensiômetro como sensor da tensão de água do solo para controlar diretamente uma válvula hidráulica acionada mecanicamente. Seis controladores foram instalados em um pomar para controlar a irrigação de seis linhas de plantas durante 64 dias. Cada equipamento controlou a irrigação de uma linha lateral. O sistema de gotejamento foi pressurizado por gravidade devido a uma fonte de água localizada sete metros acima da superfície do solo. Todos os controladores testados no campo acionaram e desligaram a irrigação autonomamente durante o período de avaliação. Os eventos de irrigação foram iniciados quando as tensões de água no solo atingiram valores estabelecidos e terminaram em baixos valores de tensão. O desempenho foi considerado satisfatório, pois as tensões de água no solo foram mantidas dentro das faixas estabelecidas considerando-se uma tolerância de 20% para pelo menos 90% do tempo. O controlador proposto mostrou-se funcional e operou adequadamente para uma faixa de tensões de água no solo até 30 kPa, comumente utilizadas em condições de irrigação com alta frequência.

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“…Therefore, without these facilities, access to ICT is impossible. [10] found that most developing countries have the lowest access to ICTs resources and within these countries; there is a notable digital divide between the rural and urban areas, the rich and the poor population. The inaccessibility to ICTs resources makes it difficult for the rural traditionally unheard people to have a voice in the happenings in the world.…”

Section: Introductionmentioning

confidence: 99%

Use of ICTs as a Source of Information for Improving Agricultural Productivity in South-West, Nigeria

Toluwase¹

2017

IJAE

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Abstract:The study investigates respondent's access to use of ICTs as a source of information for improving agricultural productivity. A well-structured questionnaire was used for data collection from the respondents. The specific objectives of the study that addressed Socio-economic characteristics, awareness of various ICTs, knowledge on ICT use and constraints facing ICT usage. Data collected was analyzed using descriptive statistics such as frequency, percentage, mean. Inferential statistics such as Chi-Square was used to establish relationship. The results obtained revealed that family members constitute the major source of information to the famers in the study areas. This is followed by radio, mobile phone and internet while extension agents rarely provide information to the famers. Findings also revealed a high rate of competence in the use of mobile phones, radio, and television sets while respondents indicated low competence level in the use of video-conferencing and fax, the attitude of farmers has a significant level of effect on the productivity of farmers. Their attitude had a 10% level of significance on the productivity among others. Policy makers should try to make agricultural information readily available through mobile devices, since they were most commonly used and since most farmers did not have contact with extension agents; hence more extension agents should be engaged in order to reach the farmers adequately.

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An autonomous controller for site-specific management of fixed irrigation systems

Cited by 57 publications

References 7 publications

Advanced Monitoring and Management Systems for Improving Sustainability in Precision Irrigation

Advanced Monitoring and Management Systems for Improving Sustainability in Precision Irrigation

Irrigation controller mechanically actuated by soil-water tension: II - Field evaluations

Use of ICTs as a Source of Information for Improving Agricultural Productivity in South-West, Nigeria

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