In general, there are three main techniques for determining the water potential of plants. The first is the compensation method, which includes the small flow method, refractometer method, conductance method, and gravimetric method. The second type is the thermocouple humidity method, including hanging drops. , dewdrop method, etc.; the third type is the pressure method. The plant moisture analyzer is the third type of technical solution for determining plant water potential. This method is currently the most widely used plant water potential measurement technology. Therefore, the application of plant moisture analyzer in modern agricultural research is very extensive. The development of water physiology and stress physiology of plants is of great significance.
The plant moisture analyzer can quickly measure the water potential of large plant tissues such as branches and intact leaves. It is an important measurement instrument in the agricultural field. The structure of the plant moisture analyzer mainly includes compressed gas cylinders. Pressure; various valves, used to adjust the speed and pressure of pressure; precision pressure gauge, only the pressure value; and plant sample room, including pressure chamber, sealed and can withstand high pressure steel cylinder. In order to ensure the accuracy of the instrument's measurement data and improve the safety of the operation, there are some precautions that need attention in the process of use.
The first is the sampling and preservation of samples. For example, the field sampling should pay attention to the sample loss of water and the integrity of the sample, ensure that there is no wound, and the loading should be completed in a shorter time as much as possible to reduce the water loss of the plant material. Second, in the process of operating the plant moisture analyzer, attention should be paid to the speed of pressurization. If the pressurization rate is too high, the measured value may be low. It is generally considered that the pressurization rate of 0.03-0.05 MPa/sec is appropriate, and the compression The gas is preferably nitrogen with 5-15% air. Finally, attention should be paid to the characteristics of the plant material. Although the plant water condition meter can adapt to the determination of various plant water potentials, in the actual measurement process, it has been found that the measured values ​​and the actual values ​​of some plants do not match, so the petiole or stem Plants that are too fragile may not be suitable for testing using a plant moisture analyzer. One thing that needs special attention is that in order to ensure safety, pressurization must not exceed the permitted range.
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