44.2. Irrigation Requirement (IR)

Try these first

1. 1.

   What does IR stand for?

   Hint

   Think about what it measures concerning water for crops.

2. 2.

   What does CWR stand for?

   Hint

   What is the total amount of water needed for crop growth?

3. 3.

   What does Irrigation Requirement (IR) account for?

   • Only rainfall
   • Water needs after considering rainfall and other sources
   • Only soil water

   Hint

   Think about all the sources of water affecting crop irrigation.

4. 4.

   True or False: Gross Irrigation Requirement (GIR) is the same as Net Irrigation Requirement (NIR).

   • True
   • False

   Hint

   Remember the definitions of NIR and GIR.

5. 5.

   Given a crop requires 800 mm of water, receives 150 mm of effective rainfall, has 40 mm contribution from groundwater, and starts with 120 mm of soil water, calculate the Irrigation Requirement.

   Hint

   Follow the formula carefully and substitute values directly.

6. 6.

   Discuss how different crop types may require different irrigation methods based on their specific CWR and effective rainfall.

   Hint

   Consider crop growth stages and specific water needs of varying crops.