The Design Of Tensiometer For Measuring Soil Water Potential

Soil water potential is often measured in agricultural production.Development of soil water potential measurement instrument is of great significance in proving soil moisture conditions.This paper designed a new performance improved tensiometer for measuring soil water potential.The tensiometer uses a hose to connect ceramic head and water collection chamber that replaces organic glass or plastic hard rod structure,that Overcome the interference of the wall effect on the measurement results and Ceramic head buried more convenient,easier to injection,While injection no tension meter disturb,to avoid the destruction of the soil structure,so that the reliability of the measurement result to be guaranteed.The main contents are as follows:(1)Overall structural design of Tensiometer.As every certain period of time,the tensiometer is necessary to be injected by water.But the structure of commonly used soil tensiometer is plexiglass or hard plastic.When injected it will disturbance the tensiometer,In turn it will destroy the soil structure,so that Reliability of measurement results,when installed in the soil,water infiltration along the hard wall,are likely to cause the wall effect.This design tension of the ceramic head and plexiglass tube separation,both connected with a pressure hose,this convenient water injection,when use only ceramic head buried into the soil while the rest of the devices on the ground,would not cause interference on the soil.(2)Various parts design and processing of tensiometer.Ceramic head which it internal design has a hollow cavity with fine ceramic materials through sol-gel molding process and special high-temperature sintering,so it can store more water,At the same time increases the ceramic head and the contact area of the external,and conducive to the inside and outside of the moisture exchange,reach equilibrium more quickly.Storage-set gas chamber volume is designed to 30ml in order to ensure that the water in it can be used longer and the material is a transparent plexiglass,that can observe the change of the water level therein.The pressure hose selection of wire braided hose,able to withstand negative pressure and small-angle bend.Selection of vacuum gauge as a pressure measuring device,and without tension power supply,so that the tension meter structure is simple,easy to use.(3)Tensiometer performance testing,the performance of the Tensiometer was tested by these three aspects through the free evaporation and soil experiments mainly from the range,holding and reaction time...