Automated monitoring of greenhouse crops

Ehret, David L.; Lau, Anthony; Bittman, S.; Lin, Wei; Shelford, Tim

doi:10.1051/agro:2001133

Cited by 52 publications

(36 citation statements)

References 55 publications

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“…The material used as a sample may be collected from the plant. However, non-destructive methods can be used, and in situ measurements can be performed using TCP that have been designed for that purpose (Ehret et al, 2001). …”

Section: Main Applications Of Tcp On Plant Materialsmentioning

confidence: 99%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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For years, one of the major concerns of agronomists has been the study of how variations in the crop environment can affect proper crop development. A variety of factors must be considered, including factors such as plant genetics, climatic conditions or soil, and factors directly dependent on man such as technology or labour. In the search for sustainable development, all these factors must coexist in perfect harmony in order AbstractThe determination of leaf water potential is useful in the establishment of irrigation guidelines for agricultural crop management practices and requires the use of various methods, among which thermocouple psychrometers (TCP). TCP have been widely used for this purpose. However, the psychrometric technique is complex and difficult to understand and the instrumentation required is difficult to handle. For this reason, a profound knowledge of the different aspects involved in the technique -which have not been clearly explained in the literature-is required. This paper reviews a number of research areas of TCP and focuses on three very specific fields: a) main applications of phsychrometry in field studies; b) determination of the measurement accuracy of psychrometric equipment, accuracy per se and accuracy tested against alternative methods; c) main errors and handling difficulties of TCP in the field. Research in these areas provides an updated overview of TCP as a method for determining water relations in plant material that will contribute criteria to select the most suitable technique according to the type of plant material and the purpose of the research and will highlight the types of instruments, accuracies and errors that have detrimental effects on measurements.Additional key words: hygrometric technique; irrigation; isopiestic technique; pressure chamber; psychrometric technique. ResumenRevisión. Aplicación de la psicrometría en campo a material vegetal: precisión y dificultades de manejo La determinación del potencial hídrico foliar es muy útil en el establecimiento de directrices de riego en las prácti-cas de manejo agrícola de los cultivos, requiriéndose del uso de diferentes métodos como los psicrómetros termopar (TCP). Los TCP han sido ampliamente utilizados. Sin embargo, se trata de una técnica compleja de difícil manejo. Por lo tanto, se requiere un profundo conocimiento de los diferentes aspectos involucrados en la técnica, que no han sido claramente explicados en los diferentes estudios publicados. Este artículo revisa una serie de líneas de investigación de los TCP. Estas áreas de investigación se han centrado en tres campos muy específicos: a) principales actuaciones en campo empleando la psicrometría; b) especificación de la precisión de los equipos, per se y frente a otras metodologías alternativas; c) principales errores y dificultades de manejo en campo de los psicrómetros. La investigación en esta área permitirá aportar una visión actualizada sobre los TCP como método de determinación de relaciones hídricas en material vegetal, aportando criterios de sele...

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Section: Main Applications Of Tcp On Plant Materialsmentioning

confidence: 99%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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“…Ben-Asher (1992) further cautioned that the sensitivity of IR sensors would be insufficient to sense very small differences in temperature and it would be unable to assess short term fluctuations of transpiration. Moreover, errors might result from stomatal closure during periods of peak solar radiation (midday depression), high ambient CO 2 concentrations, or because of disease (Ehret, 2001).…”

Section: Drought Stress Detection By Thermal Infraredmentioning

confidence: 99%

Drought Stress and the Need for Drought Stress Sensing in a World of Global Climate Change

Linke¹

2012

Irrigation Systems and Practices in Challenging Environments

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“…According to [7], sensing precision is related to system monitoring precision. In order to achieve that, the system not only must be equipped with proper sensing components but it must also ensure that this sensing capability is sustained over time, taking under consideration the calibration problem.…”

Section: Problem Statement and Related Workmentioning

confidence: 99%

Using ubiquitous computing technology to realise scalable intelligent agricultural environments

Stamatis¹,

Goumopoulos²,

Kameas³

2007

3rd IET International Conference on Intelligent Environments (IE 07)

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Wireless networks allow the deployment of sensing systems and actuation mechanisms at a much finer level of granularity than has been possible before. This paper is focused on connecting sensor data with actuators through a decision-making layer with learning capability. The decision making process regarding the provision of agricultural resources is extended this by on-line monitoring significant plant and environmental parameters and by applying machine-learning algorithms for inducing rules by analysing logged datasets to determine the significant thresholds of plant-based parameters.

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Automated monitoring of greenhouse crops

Cited by 52 publications

References 55 publications

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Drought Stress and the Need for Drought Stress Sensing in a World of Global Climate Change

Using ubiquitous computing technology to realise scalable intelligent agricultural environments

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