loss of fertility
increase in salinity
soil erosion
loss of water
Explanation
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Most irrigated lands often become unproductive in later years because of
A. loss of fertility
B. increase in salinity
C. soil erosion
D. loss of water
Answer is C
Soil erosion is may be caused by irrigation while
Loss of soil fertility may be caused by leaching, but can not be caused by irrigation. Irrigation doesn't cause loss of fertility
Irritating causes erosion while leaching causes loss of soil nutrients.
The correct answer is erosion
but during irrigation, water due to constant flowing on land washes away the soil nutrients over time which is leaching.
While loss of fertility and soil erosion can also contribute to a decline in productivity of irrigated lands, an increase in salinity is the most common cause.
Irrigation often involves the application of water to soil through channels or pipes, and water naturally contains dissolved salts. Over time, as the water evaporates or is used by plants, the salts can accumulate in the soil. If this accumulation continues, the salt concentration in the soil can reach levels that are harmful to most crops. This process is known as salinization, and it can be exacerbated by factors such as poor drainage, excessive irrigation, and the use of low-quality water.
If salinization is not addressed, it can lead to a decline in crop yields and the eventual loss of productivity of the land. Therefore, an increase in salinity is the most likely reason why most irrigated lands become unproductive in later years.
so the correct option is (B)
The correct answer is:
B. increase in salinity
Explanation:
In many irrigated lands, especially in arid and semi-arid regions, water used for irrigation contains dissolved salts. Over time, as water evaporates or is taken up by plants, salts accumulate in the soil, a process known as salinization. This build-up of salt can harm plant roots and reduce soil fertility, eventually making the land unproductive.
So, the most accurate reason is increase in salinity.
