44.4.3. Determination of Frequency

Try these first

1. 1.

   Define irrigation frequency.

   Hint

   Think about how often water is supplied to the crops.

2. 2.

   What does 'D' stand for in the frequency formula?

   Hint

   Consider what depth plants can reach to absorb water.

3. 3.

   What does 'MAD' refer to in irrigation scheduling?

   • Management Allowable Design
   • Management Allowable Depletion
   • Maximum Allowable Depletion

   Hint

   Think about the moisture levels you can manage.

4. 4.

   True or False: The deeper the root zone, the less frequently the crop needs to be irrigated.

   • True
   • False

   Hint

   Consider how water is found below the surface.

5. 5.

   A commercial farm has apple trees with a root zone depth of 800 mm, an allowable depletion of 30%, and a daily ET_c of 8 mm. Calculate the irrigation frequency and discuss how altering any of these values might affect scheduling.

   Hint

   Utilize the irrigation frequency formula while considering the implications of each factor.

6. 6.

   Assume that due to drought conditions, the ET_c increases to 12 mm/day for the same conditions as before. Calculate the new irrigation frequency and analyze the impact of environmental factors on irrigation scheduling.

   Hint

   Adjust the ET_c in the formula to see the impacts of increased water loss.