What can cause clogging in drip emitters?

Clogging in drip emitters primarily occurs due to sediment or mineral buildup from the water supply. When water is delivered through a drip irrigation system, it can carry small particles, such as dirt and minerals, particularly if the source water is not well filtered. Over time, these particles can accumulate within the emitters, leading to partial or complete blockage. This can restrict water flow and hinder the efficiency of the irrigation system, affecting plant health and the overall performance of the irrigation setup.

The other options relate to factors that might affect irrigation but do not directly cause clogging in emitters. For example, excessive sunlight exposure could potentially affect the lifespan of the materials used in emitters but does not lead to physical blockages. Improper plant spacing is more about coverage and water distribution rather than directly impacting the emitters themselves. Over-fertilization can lead to nutrient runoff and soil issues but does not cause the physical sediment buildup that leads to emitter clogging.