Which consequence results when extended irrigation using qanats introduces salts?

💡 Explanation

Salinization concentrates dissolved salts via capillary action, leading to osmotic stress because the plant's water uptake is inhibited; therefore, crop yields decrease over the long term, rather than improvements from aggregation or nitrogen, which are unrelated.

• Which immediate structural effect occurred when Roman engineers introduced pozzolanic concrete in harbor fortifications?
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• Which defensive outcome arose when medieval castle builders implemented concentric curtain walls?
• Which risk increases the most when tightly-woven planks of a rope suspension bridge experience differential sagging?
• Which problem increases when a heavily laden 18th-century sailing ship experiences hogging stress amidships during heavy seas?