44.2.4. Gross and Net Irrigation Requirement

Try these first

1. 1.

   Define Net Irrigation Requirement (NIR).

   Hint

   Focus on what water is needed for crops.

2. 2.

   What does GIR stand for?

   Hint

   Think about total water applied in irrigation.

3. 3.

   What does NIR stand for?

   • Net Irrigation Requirement
   • Nutrient Irrigation Requirement
   • Natural Irrigation Resource

   Hint

   Focus on water requirements.

4. 4.

   True or False: GIR is the actual amount of water required by the root zone.

   • True
   • False

   Hint

   Consider definitions of terms.

5. 5.

   A farmer needs to determine the water allocation for their multi-crop farm, where a corn crop requires a NIR of 600 mm, soybeans at 400 mm, and wheat at 200 mm. If the efficiency rates for irrigation systems differ (80% for corn, 70% for soybeans, and 60% for wheat), calculate the GIR for each crop, discussing how varying crop requirements impact total water use.

   Hint

   Focus on the efficiency rates for accurate calculations.

6. 6.

   Analyze how improving irrigation efficiency from 60% to 80% affects GIR for a crop with a NIR of 500 mm. Discuss the broader implications for water resource management.

   Hint

   Consider the difference efficiency makes in water rationing.