44. Irrigation Requirement and Frequency of Irrigation

Try these first

1. 1.

   What does CWR stand for?

   Hint

   Think about what water is necessary for crops.

2. 2.

   Name two components affecting CWR.

   Hint

   Components include evaporation and transpiration.

3. 3.

   What does CWR refer to in agriculture?

   • Crop Water Requirement
   • Crop Yield Range
   • Crop Weather Report

   Hint

   Think about what crops need to thrive.

4. 4.

   True or False: Effective rainfall is the total rainfall that benefits crops.

   • True
   • False

   Hint

   Consider how some rainwater may be lost to runoff or evaporation.

5. 5.

   Given that the effective rainfall is 150 mm, CWR is 400 mm, and the contribution from initial soil moisture is 30 mm, calculate the irrigation requirement.

   Hint

   Use the relevant formula and plug in the right values.

6. 6.

   You have a plot with a root zone depth of 60 cm, MAD is 20%, and ET_c is 5 mm/day. Calculate the irrigation interval.

   Hint

   Pay attention to the units used and the formula.