Experimental content Study of the evapotranspiration measurement by use of a lysimeter Study of a lysimeter operation Determine lysimeter sensitivity to gains and losses in weight at different manometer angles and to relate this to gains or losses in water Demonstrate the components of the soil-plant-water system using the lysimeter Measuring the variations of water loss or gain from the soil and plant due to evapotranspiration, precipitation and drainage processes Demonstrate the principles of relationships between reference crop evapotranspiration, maximum and actual evapotranspiration Determination of the plants water usage Determine changes in diurnal evapotranspiration as measured by the lysimeter