What is a consequence of waterlogging in soil?

Waterlogging occurs when soil becomes saturated with water, leading to anaerobic conditions where oxygen levels diminish significantly in the root zone. This lack of oxygen can severely impact plant roots, as they rely on oxygen for respiration and nutrient uptake. When oxygen is deficient, it can cause root stress, and eventually lead to root damage, decay, or death. Moreover, the anaerobic environment can create toxic conditions due to the buildup of harmful substances, such as hydrogen sulfide, which further exacerbates plant health issues. Therefore, toxicity due to lack of oxygen is a notable consequence of waterlogged soils, making it the most accurate choice among the options provided.