Which outcome reduces crop yields when using qanat irrigation systems?

💡 Explanation

Increased dissolved solid concentration decreases crop yields, because capillary action transports salts to the surface during evaporation, leading to soil salinization. This inhibits water uptake due to osmotic pressure effects, rather than increased drainage or reducing overall water loss.

• Which outcome arose from repeated wetting/drying of 18th-century ship timbers?
• Which outcome occurs relating to Roman aqueducts when travertine deposition narrows culvert inlets?
• Which consequence resulted from over-reliance on tributary protection during dynastic decline in the Byzantine Empire?
• Which inaccuracy increased for ships using early chronometers if improperly shielded from temperature fluctuations?
• Which resource limitation primarily constrained the expansion of pre-Columbian chinampa agriculture around Lake Texcoco?
• Which outcome occurred when hillside terrace construction exceeded soil cohesion limits in ancient Andes?