20.3.1.a. Lysimeter Method

Try these first

1. 1.

   What is a lysimeter?

   Hint

   Think about its purpose in water measurement.

2. 2.

   Name one advantage of using lysimeters.

   Hint

   Consider what accuracy means in water management.

3. 3.

   What is the primary function of a lysimeter?

   • To measure rainfall
   • To measure evapotranspiration
   • To measure soil fertility

   Hint

   Think about its purpose.

4. 4.

   True or False: Lysimeters are suitable for large-scale agricultural applications.

   • True
   • False

   Hint

   Consider their practicality.

5. 5.

   A farmer uses two lysimeters to measure evapotranspiration of two different crops over a month. The first lysimeter recorded a weight loss of 900 kg with 300 kg of rainfall and 100 kg of drainage. The second lysimeter recorded a weight loss of 700 kg with 200 kg rainfall and 80 kg drainage. Calculate the ET for both crops. Which crop experiences more evapotranspiration?

   Hint

   Use the weight balance formula!

6. 6.

   Discuss the implications of using lysimeters for calculating regional evapotranspiration under different climatic conditions. How might results vary?

   Hint

   Consider how different climates impact crop water demands.