437 Hits in 4.4 sec

Dynamic modelling of lettuce transpiration for water status monitoring

Olutobi Adeyemi, Ivan Grove, Sven Peets, Yuvraj Domun, Tomas Norton
2018 Computers and Electronics in Agriculture  
In this paper, a novel plant water status monitoring framework 34 based on the transpiration dynamics of greenhouse grown lettuce plants is presented. 35 Experimental results indicated that lettuce plants  ...  A 37 data-driven model for predicting the transpiration dynamics of the plants was developed 38 using a system identification approach.  ...  Acknowledgements: The authors wish to acknowledge John Oldacre foundation for funding 529 this research project 530  ... 
doi:10.1016/j.compag.2018.10.008 fatcat:sexd4sujxfgyrf46hi5fxnkdea

Dynamic modelling of the baseline temperatures for computation of the crop water stress index (CWSI) of a greenhouse cultivated lettuce crop

Olutobi Adeyemi, Ivan Grove, Sven Peets, Yuvraj Domun, Tomas Norton
2018 Computers and Electronics in Agriculture  
A B S T R A C T The crop water stress index (CWSI) has been shown to be a tool that could be used for non-contact and real-time monitoring of plant water status, which is a key requirement for the precision  ...  In this study, the canopy temperature of greenhouse cultivated lettuce plants which were maintained as either well-watered or non-transpiring was continuously monitored along with prevailing environmental  ...  Monitoring tools that provide accurate information regarding plant water status would, therefore, be beneficial for scheduling and management of irrigation in protected crop cultivation (Adeyemi et al  ... 
doi:10.1016/j.compag.2018.08.009 fatcat:lawszcxfazhuhkv62kxoe3y4ci

Automated monitoring of greenhouse crops

David L. Ehret, Anthony Lau, Shabtai Bittman, Wei Lin, Tim Shelford
2001 Agronomie  
appropriate real-time crop data into dynamic models. greenhouse / crop monitoring / climate control / sensors /environmental sustainability Résumé -Suivi automatique des cultures sous serre.  ...  Some of these techniques are now being tried in commercial greenhouses and hold the promise of improved climate management for better yield and quality, and reductions in environmental impact.  ...  Heissner [26] used the transpiration data for sweet pepper to develop a model for greenhouse climate control.  ... 
doi:10.1051/agro:2001133 fatcat:i3ayunwpsjdddpnw6dqyuiescm

Reducing the Evaporative Demand Improves Photosynthesis and Water Use Efficiency of Indoor Cultivated Lettuce

Chiara Amitrano, Youssef Rouphael, Antonio Pannico, Stefania De Pascale, Veronica De Micco
2021 Agronomy  
Currently, climate change is affecting considerably the availability of freshwater for agriculture, increasing the need for the optimization of crop water use efficiency.  ...  We discuss the role of VPD management as necessary to maximize crop water use by harmonizing photosynthesis and transpiration.  ...  Conflicts of Interest: The authors declare no conflict of interest (financial or nonfinancial) for this research.  ... 
doi:10.3390/agronomy11071396 fatcat:goile3tstbcolnvemkyfim6ixq

A root zone modelling approach to estimating groundwater recharge from irrigated areas

J. Jiménez-Martínez, T.H. Skaggs, M.Th. van Genuchten, L. Candela
2009 Journal of Hydrology  
The fraction of applied water (irrigation plus precipitation) going to recharge ranged from 22% for a summer melon crop to 68% for a fall lettuce crop.  ...  In this study we estimated irrigation return flow using a root zone modelling approach in which irrigation, evapotranspiration, and soil moisture dynamics for specific crops and irrigation regimes were  ...  Gratitude is expressed to Almudena Jiménez for collecting data and working with the instrumentation, and to the Technical University of Cartagena.  ... 
doi:10.1016/j.jhydrol.2009.01.002 fatcat:xaqzn7xkqvafreor4daua2vehy

High Light Intensity from Blue-Red LEDs Enhance Photosynthetic Performance, Plant Growth, and Optical Properties of Red Lettuce in Controlled Environment

Giuseppe Carlo Modarelli, Roberta Paradiso, Carmen Arena, Stefania De Pascale, Marie-Christine Van Labeke
2022 Horticulturae  
Lettuce plants of the type Batavia cv 'Blackhawk' were grown in plastic pots filled with perlite and peat (20:80 v/v) for 33 days in a growth chamber under blue (B, 20%) and red (R, 80%) LED light at a  ...  Among the three light intensities, 389 µmol m−2 s−1 (DLI 22.41 mol m−2 d−1) gave the best results for growing Batavia red lettuce cv 'Blackhawk', since it enhances both production and qualitative traits  ...  Acknowledgments: The authors are thankful to Christophe Petit for his help and technical assistance in setting up the experiment. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/horticulturae8020114 fatcat:mqtx4wwk5vdkdatr4tbtjby5vm

Speaking Plant Approach for Automatic Fertigation System in Greenhouse [article]

Usman Ahmad, Dewa Made Subrata, Chusnul Arif
2013 arXiv   pre-print
The results showed that the development of the plants can be monitored using this method.  ...  Dosage of nutrition in water for many vegetable plants are also known so that by controllingwater supply all the needsfor the plants to grow are available.  ...  Acknowledgment The authors would like to thank the Directorate General of Higher Education, Ministry of Education of Indonesia, who funded this research activities through Competitive Grant Program (Hibah  ... 
arXiv:1303.1869v1 fatcat:ncwxduqzgverhgnwul2hkiik6e

Nitrate accumulation in plants: a role for water

R Cardenas-Navarro
1999 Journal of Experimental Botany  
For instance, there are reports of values higher monitored (1) in tomato plants in a growth room, during than 65×10−6 mol g−1 fr. wt. in lettuce leaves (Gaudreau the day/night cycle with varied light intensities  ...  design of models predicting plant total nitrogen content time-scales.  ...  of water for plant nitrate accumulation, as affected by In experiment 5, nitrate and water contents were monitored genetic and environmental factors.  ... 
doi:10.1093/jexbot/50.334.613 fatcat:cenpg3yzazesbgtqpkznwa3iua

Strategies to control water and nutrient supplies to greenhouse crops. A review

Hans-Peter Kläring
2001 Agronomie  
are predicted using growth and transpiration models.  ...  de croissance et de transpiration.  ...  De Tourdonnet combined a soil behavior model and a crop growth model for lettuce that includes the processes of water and nitrate absorption [16] .  ... 
doi:10.1051/agro:2001126 fatcat:mtpzc3gdivc2fnsx2gvtbuwu5u

Development of a Model and Sensor Based Smart Irrigation System

T.I. Ogedengbe, O.M. Eta, A.A. Ogunbiyi
2020 Journal of Applied Sciences and Environmental Management  
This project developed a smart irrigation system capable of making autonomous decision of irrigating the soil with an appropriate amount of water required through monitoring of soil irrigation factors.  ...  The soil moisture level and the rainfall status were the soil irrigation factors considered. The threshold values of the irrigation factors required for soil to be irrigated were established.  ...  Water is required for the basic growth and maintenance of plants. When the amount of water available for plants need is not adequate, stress can occur.  ... 
doi:10.4314/jasem.v24i5.28 fatcat:jmyn747nffbivpazmy5mwww5n4

Effect of irrigation frequency on growth and production of a cucumber crop under soilless culture

Georgios Nikolaou, Damianos Neocleous, Nikolaos Katsoulas, Constantinos Kittas
2017 Emirates Journal of Food and Agriculture  
However, HIF increased the transpiration rate of the plants, resulting in less water and nutrient losses.  ...  The amount of water applied was 0.192 Kg m-2, 0.288 Kg m-2 and 0.448 Kg m-2 for high, medium and low irrigation frequencies, respectively.  ...  Plant transpiration was directly monitored, by a weighting lysimeter consisting of a load cell "S type" (Model 9363; Vishay Precision Group, Malvern, USA) mounded from the greenhouse ceiling to a plant  ... 
doi:10.9755/ejfa.2017.v29.i11.1496 fatcat:hog2ezhvgfckhobjosvpy63xg4

High-Throughput Phenotyping: A Platform to Accelerate Crop Improvement

Sumit Jangra, Vrantika Chaudhary, Ram C. Yadav, Neelam R. Yadav
2021 Phenomics  
These technologies provide precise measurements of desired traits among thousands of field-grown plants under diversified environments; this is a critical step towards selection of better performing lines  ...  breeding strategies and meet the future needs of stakeholders.  ...  PHENODYN has been used to measure soil water status, transpiration, and growth in maize.  ... 
doi:10.1007/s43657-020-00007-6 fatcat:kfqiivoas5hsjkjbfcha5546vq

Physiological aspects of increased CO2 concentration

H. van Keulen, H. H. van Laar, W. Louwerse, J. Goudriaan
1980 Cellular and Molecular Life Sciences  
Stomatal resistance may be controlled by the internal water status of the plant. Where water is limiting, stomata close thus reducing the rate of transpirational loss.  ...  Dynamic computer simulation models of crop growth that have been duly validated may be used for this purpose, by carrying out simulation experiments.  ... 
doi:10.1007/bf01978580 fatcat:3ot2quc6f5ff5k4pivsa7tb6ba

Crop modelling in horticulture: state of the art

C Gary, J.W Jones, M Tchamitchian
1998 Scientia Horticulturae  
For decision making, crop models should be integrated in a model of the whole system under control and connected to a model of the decision system.  ...  For the last two decades, crop modelling has become a major research tool in horticulture as in other areas of plant production. A reason for such a success is the versatility of this technique.  ...  Acknowledgements The authors thank Michel Genard and Loıc Pages for their comments that helped¨c over all the fields of horticulture.  ... 
doi:10.1016/s0304-4238(98)00080-6 fatcat:dyvggoluhngnbegy45g5m57uny

The Photosynthetic Performance of Red Leaf Lettuce under UV-A Irradiation

Giedrė Samuolienė, Akvilė Viršilė, Jurga Miliauskienė, Perttu Haimi, Kristina Laužikė, Julė Jankauskienė, Algirdas Novičkovas, Asta Kupčinskienė, Aušra Brazaitytė
2020 Agronomy  
The objective of this study was to evaluate how different UV-A wavelengths influence the morphology and photosynthetic behavior of red-leaf lettuce (Lactuca sativa L. cv. Maiko).  ...  The correlation of the photosynthetic rate (Pr) with the stomatal conductance (gs) indicated that the increase in the Pr of lettuce under supplemental UV-A radiation was due to the increase of gs, instead  ...  Figure 2 . 2 Photosynthetic status of lettuce subjected to different light qualities: RB-Red 662 and Blue 452 nm (Control); BRUV402-Control with UV-A 402 nm; BRUV387-Control with UV-A 387 nm; BRUV367-Control  ... 
doi:10.3390/agronomy10060761 fatcat:iosl4ojazzgmzf5mfpdot2d55i
« Previous Showing results 1 — 15 out of 437 results