Use of an Off-the-Shelf Electronic Balance for Monitoring Crop Transpiration in Greenhouses

Meurs, W.Th.M. van; Stanghellini, C.

doi:10.17660/actahortic.1992.304.24

Cited by 11 publications

(6 citation statements)

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“…To assess the effects of fungal endophytes on plant activity and growth, we measured whole‐plant water loss, number of wilt‐free days, plant height, and number of tillers at 3‐d intervals (days 1, 4, 7, 10, 13, 16, 19). Whole‐plant water loss was measured as the loss of water by mass from each planting box at each time, adjusted for average water loss from plant‐free controls during the same time period (Meurs and Stanghellini, 1992). The average rate of water loss was calculated over time (g water·d −1 ).…”

Section: Methodsmentioning

confidence: 99%

Climate affects symbiotic fungal endophyte diversity and performance

Giauque

Hawkes

2013

American J of Botany

114

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Section: Methodsmentioning

confidence: 99%

Climate affects symbiotic fungal endophyte diversity and performance

Giauque

Hawkes

2013

American J of Botany

114

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“…Crop transpiration rate was measured using two weighing lysimeters (Van Meurs and Stanghellini, 1992) located in the centre of a row to form a continuous canopy at the middle of the greenhouse. Each lysimeter consisted of a tray with a drainage collector carrying one rockwool slab or one perlite grow-bag and placed on an electronic balance (KCC150, Mettler Toledo, Giesen, Germany) with ± 0.001 kg resolution and 150 kg measurement range.…”

Section: Measurementsmentioning

confidence: 99%

Oxygen enrichment of nutrient solution of substrate-grown vegetable crops under Mediterranean greenhouse conditions: oxygen content dynamics and crop response

Bonachela

Acuña

Magán³

et al. 2010

Span. j. agric. res.

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This work assessed the seasonal dynamics of the substrate oxygen content and the response to oxygen enrichment of nutrient solution (oxyfertigation) of autumn-winter sweet pepper and spring melon crops grown on rockwool slabs (2003/04 season) and perlite grow-bags (2004/05), compared to non-enriched crops. Dissolved Oxygen (DO) values in the nutrient solution were higher for all the oxygen enriched treatments (> 20 mg L -1 ) than for the non-enriched ones (~4 mg L -1 ), but no significant differences were found in the substrate solution. For pepper crops, DO values were highest at the onset and, especially, at the end of the cycle in winter, while the lowest DO values (3 to 4 mg L -1 ) occurred during September and October. For melon, DO values decreased progressively from the onset of the cycles to values ≤ 3 mg L -1 during the second half of the cycles. For pepper crops, there were no significant differences between oxygen treatments for fruit production, which could be attributed to the fact that DO values were > 3 mg L -1 throughout each crop cycle. However, a significant 7% increase in total and marketable yield, associated with a higher fruit number, was observed for the oxygen enriched melon grown on rockwool slabs, whereas no significant differences were found for the melon grown on perlite grow-bags. In conclusion, the use of inexpensive systems of substrate oxygen enrichment should be restricted to rockwool substrates and to crop periods when a high oxygen demand coincides with low oxygen availability, such as the period from melon flowering phase.Additional key words: Capsicum annuum; Cucumis melo; dissolved oxygen; hypoxia; melon; perlite grow-bag; rockwool slab; sweet pepper. ResumenContenido de oxígeno y respuesta de cultivos hortícolas en sustrato e invernadero al enriquecimiento de oxígeno de la solución nutritiva

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“…The loadcells were connected to a digital junction box (Leon engineering DJB-4) which logged to a PC. In this set-up transpiration was calculated on a minute-to-minute basis by ignoring differences in fresh weight (van Meurs and Stanghellini, 1992). For noise reduction, a 20-minute running average was used.…”

Section: Methodsmentioning

confidence: 99%

On-Line Acquisition of Plant Related and Environmental Parameters (Plant Monitoring) in Gerbera: Determining Plant Responses

Baas¹,

Slootweg²

2004

Acta Hortic.

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For on-line plant monitoring equipment to be functional in commercial glasshouse horticulture, relations between sensor readings and plant responses on both the short (days) and long term (weeks) are required. For this reason, systems were installed to monitor rockwool grown gerbera plants on a minute-to-minute basis from July 2002 until April 2003. Data collected included, amongst others, crop transpiration from lysimeter data (2 m 2 ), canopy temperature using infrared sensors, rockwool water content, and greenhouse climatic parameters, such as global radiation and temperature. By combining data from lysimeter and water content, changes in crop fresh weight could be calculated on a daily basis. Both transpiration and daily fresh weight production were better related to light integral as measured inside the greenhouse, than outside the greenhouse. The contribution of heating pipes underneath the canopy to transpiration could be estimated with the system. From the relation between daily FW production and previous day light integral, a light use efficiency of ca. 10-g FW/MJ solar radiation as measured inside the greenhouse was calculated. Water use efficiency was on average 25 g FW/L. A 3-4 day drying cycle did not affect flower production. The results underline the importance of knowledge on the adaptation and tolerance of crops to stressful conditions, in order to be able to use plant monitoring under grower conditions effectively.

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Use of an Off-the-Shelf Electronic Balance for Monitoring Crop Transpiration in Greenhouses

Cited by 11 publications

References 0 publications

Climate affects symbiotic fungal endophyte diversity and performance

Climate affects symbiotic fungal endophyte diversity and performance

Oxygen enrichment of nutrient solution of substrate-grown vegetable crops under Mediterranean greenhouse conditions: oxygen content dynamics and crop response

On-Line Acquisition of Plant Related and Environmental Parameters (Plant Monitoring) in Gerbera: Determining Plant Responses

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