For a standing crop, the consumptive use of water is equal to the depth of water

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Question
For a standing crop, the consumptive use of water is equal to the depth of water
Options
A. transpired by the crop
B. evaporated by the crop
C. transpired and evaporated by the crop
D. used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil.

Correct Answer

used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil.

Irrigation problems

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1. The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is
Options
A. 8 cm
B. 10 cm
C. 12 cm
D. 14 cm
E. 16 cm

2. Lacy's regime condition is obtained if
Options
A. silt grade in the channel is variable
B. discharge in the channel is variable
C. silt charge in the channel is variable
D. channel flows in unlimited, incoherent alluvium of the same character as that transported material.

3. The consumptive use of water for a crop
Options
A. is measured as the volume of water per unit area
B. is measured as depth of water on irrigated area
C. may be supplied partly by precipitation and partly by irrigation
D. all the above.

6. The useful moisture of soil, is equal to its
Options
A. field capacity
B. saturation capacity
C. moisture content at permanent wilting point
D. difference between filed capacity and permanent wilting point within the root zone of plants.

8. A fall in a canal bed is generally provided, if
Options
A. ground slope exceeds the designed bed slope
B. designed bed slope exceeds the ground slope
C. ground slope is practically the same as the designed bed slope
D. none of these.

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