Question

Which of the subsequent methods of cultivation causes salinization of soil?
(A) Transplantation
(B) Crop rotation
(C) Excessive irrigation
(D) Broadcasting

Answer 1

Hint:Excessive water system increases the quantity of salt on the outside of soil thanks to evaporation. the buildup of salts harms the dirt fruitfulness, aside from rice; most crops get as could be set back in their development when overabundance water deteriorates.

Complete answer:
Salts are a characteristic part of soils and water. The ions liable for salination are Na+, K+, Ca2+, Mg2+, and Cl−. Throughout long periods of your time, as soil minerals climate and delivery salts, these salts are flushed or filtered out of the dirt by wastewater in territories with adequate precipitation. additionally, to mineral enduring, salts also are deposited through residue and precipitation. Salts may gather in dry regions, resulting in naturally saline soils. this is often the case, for the occasion, in enormous pieces of Australia.
Human practices can expand the saltiness of soils by the expansion of salts in the water system water. An appropriate water system on the board can forestall salt aggregation by giving satisfactory wastewater to drain added salts from the dirt. Disturbing waste examples that give leaching also can end in salt gatherings.
An illustration of this happened in Egypt in 1970 when the Aswan High Dam was fabricated. The change within the level of spring water before the development had enabled erosion, which prompted a high centralization of salts within the water level. After the development, the continual high level of the water level led to the salinization of the arable land.

Hence option C is the correct answer.

Note:Salts happen normally inside soils and water. Salinization is often caused by normal processes like mineral enduring or by the slow withdrawal of a sea. It also can happen through counterfeit processes like irrigation and street salt.