The HA-ZLZ-3000 Plant Moisture Condition Measuring Instrument is a specialized device designed to measure plant water potential (Ψ) and its individual components, while also enabling the extraction of xylem sap for further chemical analysis. This instrument plays a crucial role in understanding the water dynamics within plants and their interaction with the surrounding environment. It is widely used in fields such as plant physiology, ecology, agronomy, forestry, and pasture management. As an essential tool for both teaching and research, it supports efforts in optimizing water usage and developing drought-resistant crop and forest varieties. Its user-friendly design allows for quick and efficient operation, whether in laboratory settings or in the field.
Key specifications of the HA-ZLZ-3000 include a measuring range of 0–10.00 MPa, with digital readouts for accurate results. The instrument has a compact size of 550 mm × 280 mm × 350 mm and weighs approximately 9 kg, making it portable and easy to handle.
The measurement principle relies on the continuous water flow within the soil-plant-atmosphere system. Roots absorb water from the soil, while leaves lose water to the atmosphere, creating a water potential gradient. This gradient drives the movement of water through the xylem, where tension develops due to the low water potential in the air. When a branch or leaf is cut, the water column in the xylem becomes disrupted, and the water retracts toward the cut surface. By placing the cut sample into the instrument’s pressure chamber, pressure is applied to restore the tension, pushing the water column back to the cut surface. The measured pressure corresponds directly to the plant’s water potential.
The HA-ZLZ-3000 comes with various accessories, including O-rings of different sizes (inner diameter 61 mm, outer diameter 65.8 mm), slotted O-rings (1.5×12 mm), and O-rings with holes of varying diameters (3 mm, 5 mm, 7 mm). Additional components include stainless steel copper gaskets with and without holes, a high-pressure metal hose (2M), a gas cylinder connection adapter, and a 3x magnifying glass. These accessories ensure flexibility and precision during measurements, supporting accurate and reliable data collection.
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