The principle of measurement of plant water potential meter is that in the soil-plant-atmosphere continuous system, the root continuously absorbs water from the soil, and the leaves continuously lose water to the surrounding environment. In this water potential gradient system, the plant root-stem-leaf There is also a water potential gradient, so that the small water column in the xylem conduit is affected by the negative pressure of the low water potential of the air, forming a pulling force for the upward transport of moisture. When the plant branches or leaves are cut, the tensioned water column in the conduit breaks and the water column contracts from the incision to the inside. Put the cut material into the pressure chamber of the instrument (see below for the operating procedure), so that one end of the slit extends out of the room and is pressurized, so that the tension in the branches or leaves is rebalanced and the small water column is pushed back to the surface of the cut surface. All the pressure is the water potential of the plant.
The FA-ZLZ-3000 Plant Water Potential Tester is an instrument for determining the plant water potential (Ψ) and its constituents and for extracting xylem conduit juice for component analysis. It can be used to study the water relationship of plants and the relationship between plants and the environment.
The FA-ZLZ-3000 plant water potential measuring instrument is a digital display panel with a measuring range of 0-10.00 MPa and a reading accuracy of 0.01 MPa, which can fully meet the technical requirements of customers and is suitable for plant physiology, ecology, agronomy, Forestry and pasture research.
How to assemble and use the instrument:
1. Power-on instructions: Turn off the “intake valve†and “exhaust valve†of the instrument.
2, quick connector (new)
3. Connect the other end of the high-pressure metal hose to the cylinder through the transition joint. The cylinder should be filled with nitrogen or compressed air. Do not use flammable or explosive gases such as oxygen or hydrogen.
4. Fix the air inlet connected to the high pressure hose with a small wrench and tighten the joint with a large wrench. Note: The new water meter has used a quick connector.
Measurement steps:
1. Preparation of the instrument:
Remove the pressure chamber cover, install the corresponding size hole (seam) metal gasket and rubber gasket according to the requirements of the measured materials, and close the intake valve and exhaust valve. In order to avoid the influence of the temperature rise in the pressure chamber and the drying of the air when the instrument is pressurized too high. The wet gauze block can be placed on the bottom of the pressure chamber (note: do not block the air intake) or cover the material.
2. Sampling and loading:
Use a small blade to cut the test sample (branches, stalked leaves, grass blades, or aerial parts of the seedlings, etc.), and the petioles and branches should have a length of more than 3 cm to facilitate fixation to the gasket. If the sample cannot be measured immediately, it should be quickly placed in a plastic bag or slightly moist gauze to prevent water loss. The material of the material should be flattened, otherwise a thin vertical smooth cut should be made.
The material is passed through a hole (slit) in the lid to expose the cut end by a few millimeters. Rotate the material with a pressure cap to seal the material (to make the seal without damaging the material, which requires operational experience). In order to reduce moisture loss, the cover should be placed back as soon as possible so that it descends along the groove and rotates clockwise. (If the gasket slides, you can use the tweezers when fixing.)
Close the pressure chamber.
Remember not to inadvertently pressurize when the lid is not covered, so as not to cause the risk of the pressure chamber cover coming out!!
Flourescent Drawing Board
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