How does over-irrigation lead to salinization?

Answer 1

Over-irrigation actually can increase soil salinity due to the transport of dissolved salts.

Rising watertables can bring salts into the plant root zone, which affects both plant growth and soil structure. The salt stays behind in the soil when water is taken up by plants or lost to evaporation. Increased rates of leakage and groundwater recharge cause irrigation salinity.

The file irrigation-salinity-causes-and-impacts.pdf can be found at http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0018/310365.

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Answer 2

Cora Andrews

Over-irrigation can lead to salinization by promoting water movement through the soil, bringing dissolved salts to the surface. Excessive water evaporation then leaves the salts behind, leading to an accumulation in the topsoil.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.