Water retention is a research area that focuses on understanding the processes and mechanisms by which water is held within the soil, particularly in relation to its impact on plant growth, agricultural productivity, and water resource management. This research area explores factors such as soil texture, structure, and organic matter content, as well as the influence of climate, land use practices, and irrigation methods on water retention in the soil. The goal of this research is to improve our ability to predict, manage, and optimize water availability for plants, ecosystems, and human activities.