The top soil of a water logged field becomes more alkaline and infertile if its

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Question
The top soil of a water logged field becomes more alkaline and infertile if its p^H value is
Options
A. 6
B. 8
C. 9
D. 10
E. 11

Correct Answer

11

Irrigation problems

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2. Pick up the correct statement from the following
Options
A. Approach of the water line in a flumed channel section should not be steeper than
B. Departure of the water line from a flumed channel section should not be steeper than 30�
C. Approach of the water line should not be steeper than 30� and departure line not steeper than in a flumed channel section
D. Approach and departure of the water line in a flumed channel section, should not be steeper than

3. The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally
Options
A. 2 : 1
B. 3 : 1
C. 4 : 1
D. 5 : 1
E. 6 : 1

4. Pick up the incorrect statement from the following
Options
A. A bank in the cross-section of a canal is provided on the right
B. A bank in the cross-section of a canal is provided on the left
C. A 'dowla' in the cross-section of a canal is provided on the left
D. None of these.

7. The measure to remove water logging of land, is
Options
A. to reduce percolation from canals and water courses
B. to increase outflow from the ground water reservoir
C. both (a) and (b)
D. neither (a) nor (b)

10. For a given discharge in a channel, Blench curves give the relationship between the loss of head (H_L) and
Options
A. specific energy up-stream
B. specific energy down-stream
C. critical depth of water down-stream
D. depth of water down-stream

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