What can be the consequences of using poor-quality water in an irrigation system?

Using poor-quality water in an irrigation system can lead to a reduction in soil fertility over time. When water contains high levels of salts, heavy metals, or organic pollutants, it can degrade soil structure and nutrient availability. Saline water can cause ion toxicity and osmotic stress to plants, leading to reduced growth and productivity. Additionally, contaminants can disrupt microbial activity in the soil, which is essential for nutrient cycling and overall soil health. Over time, this degradation can diminish the soil's ability to support healthy plant growth, ultimately impacting agricultural productivity and ecosystem balance.

In contrast, other options suggest outcomes that are incompatible with the use of poor-quality water. Enhanced plant health, improved water retention, and increased crop yield would generally not result from utilizing water that adversely affects soil and plant health.