Which of the following is a benefit of proper drainage in irrigation?

Proper drainage in irrigation is crucial because it effectively prevents water-logged soil conditions. When soil remains saturated with excess water, it can lead to a variety of issues such as root rot, reduced oxygen availability for plants, and an overall decline in plant health. Well-drained soil allows excess water to move away from the root zone, promoting healthier root development and improving overall plant growth. Effective drainage systems enhance soil aeration and improve the uptake of nutrients, leading to better crop production and sustainability.

The other aspects mentioned do not represent direct benefits of proper drainage. For example, while soil testing is important, proper drainage does not negate the need for it; soil testing remains necessary for understanding soil health and nutrient requirements. Additionally, proper drainage does not eliminate the need for irrigation techniques; instead, it complements them by ensuring that water is applied efficiently and effectively. Lastly, proper drainage aims to reduce soil erosion, as water movement can exacerbate erosion if not managed correctly. Thus, preventing water-logged conditions provides a clear and significant benefit in the context of irrigation.