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Modern photosynthetic systems may also be designed to measure leaf temperature, chamber air temperature, PAR (photosynthetically active radiation), and atmospheric pressure. These systems may calculate water use efficiency (A/E), stomatal conductance (gs), intrinsic water use efficiency (A/gs), and sub-stomatal CO 2 concentration (Ci). [3]
Indirectly - by measuring the distance the water level drops in the graduated tube over a measured length of time. It is assumed that this is due to the cutting taking in water which in turn is necessary to replace an equal volume of water lost by transpiration. Directly - by measuring the reduction in mass of the potometer over a period of time.
Disdrometer for measuring drop size distribution; Transmissometer for measuring visibility; Ceilometer for measuring cloud ceiling; More sophisticated stations may also measure the ultraviolet index, leaf wetness, soil moisture, soil temperature, water temperature in ponds, lakes, creeks, or rivers, and occasionally other data.
Stomatal conductance, usually measured in mmol m −2 s −1 by a porometer, estimates the rate of gas exchange (i.e., carbon dioxide uptake) and transpiration (i.e., water loss as water vapor) through the leaf stomata as determined by the degree of stomatal aperture (and therefore the physical resistances to the movement of gases between the air and the interior of the leaf).
The best water for houseplants is room temperature rainwater. Hard water from the tap can result in mineral buildup in the soil. Municipal water sources may have additives like chlorine or ...
Respirometry depends on a "what goes in must come out" principle. [6] Consider a closed system first. Imagine that we place a mouse into an air-tight container. The air sealed in the container initially contains the same composition and proportions of gases that were present in the room: 20.95% O 2, 0.04% CO 2, water vapor (the exact amount depends on air temperature, see dew point), 78% ...
Microclimate control systems allow adjustment of the measuring chamber temperature, CO 2 level, light level, and humidity level for more detailed investigation. The combination of these systems with fluorometers, can be especially effective for some types of stress, and can be diagnostic, e.g. in the study of cold stress and drought stress. [6 ...
Experts talk lights, humidifiers, watering aids and more to keep your plants thriving while you're away. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ...