Reclamation And Waterlogging In Soil


9 Questions MCQ Test Mock Test Series for Civil Engineering (CE) GATE 2020 | Reclamation And Waterlogging In Soil


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QUESTION: 1

A land is said to be water-logged, when

Solution:

A land is said to be water-logged when its productivity gets affected by the high water table. The productivity of land gets affected when the root zone of the plants gets flooded with water.

QUESTION: 2

Water-logging of cropped land leads to reduced crop yields, due to

Solution:

The life of a plant depends upon the nutrients like nitrates and the form in which the nitrates are consumed by the plants is produced by the bacteria, under a process called nitrification.
These bacteria need oxygen for their survival. The supply of oxygen gets cutoff when the land becomes ill aerated, resulting in death of these bacteria, and fall in production of plant’s food and consequent reduction in the plant’s growth, which reduces the crop yield.

QUESTION: 3

Which one of the followings does not contribute to water logging?

Solution:
QUESTION: 4

Which one of the followings, is not a remedial measure for water logging?

Solution:
QUESTION: 5

Alkaline soils are best reclaimed by

Solution:
QUESTION: 6

A recently reclaimed alkaline soil should preferably be sown with a salt resistant crop, like

Solution:

In case of leaching, the land is flooded with adequate depth of water. The alkaline salts present in the soil, get dissolved in this water, which percolate down to join the water table. The process is repeated till the salts in the top layer of the land are reduced to such an extent that some salt resistant crop can be grown. High salt resistant crops like fodder, berseem, bajra etc., are now grown on this leached land for one or two seasons.

QUESTION: 7

The method, which uses dead furrows on cropped farms for drainage of excess irrigation or rain water, is called:

Solution:
QUESTION: 8

Acidic soils are reclaimed by

Solution:

The salts injurious to the health of plants are alkali salts e.g., Na2CO3, Na2SO4 and NaCI. Such a salt affected soil is unproductive and is known as saline soil. If the soil is saline and the efflorescence continues for a long period, then soils become ill aerated and highly unproductive and these are called alkaline soils. These soils can be reclaimed by,
(i) Leaching
(ii) Providing surface and subsurface drainage of the area 
(iii) Crop rotation
(iv) Lining of canals and water courses
(v) Reducing the intensity of irrigation.
(vi) Optimum use of water
(vii) Gypsum addition
Acidic soils, on the other hand, can be reclaimed by basic salts such as limestone.

QUESTION: 9

Leaching is a process

Solution:

Leaching is the process in which land is flooded with adequate depth of water. The alkaii salts' present in soil, get dissolved with this water which percolate down to join the water table or are drained away by sub-surface drains,
Leaching requirement, 
Dd is Depth of water drained out per unit area
Di is Depth of irrigation water applied per unit area

ECi is Electrical conductivity of irrigation water
ECd is Electrical conductivity of drained water.

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