to develop this method.
27 2.8.22 Mesurement of soil moisture potential 2.8.221 The tensiometer method Tensiometers are used for direct mesurements of soil-moisture suction in the range of 0 to 100 KPa. The instrument consists of a porous oup filled with water and buried in the soil. The movement of the water to the soil creates a negative pressure or suction, the equilibrium value of which can be measured by a vacuum gauge. This vacuum gauge can either be a directly read manometer (e.g. Bourdon or mercury type) or ab bstrain-gauge based pressure transducer used together with an electrical indicator or recording device. When the matric suction approaches the value of the atmospheric pressure, air enters the porous cups and useful readings can no longer be made. Therefore, tensiometers maybe useful in irrigation Share with your friends: |
