The number of times water is applied to a specific area, whether this is a a yard, a community landscape, a golf course, or a field, over a certain period of time - usually a week or a month. In short, it is a measure of how often irrigation is performed in a certain area. The factors that can influence the chosen frequency of application include weather, soil moisture, plant type and stage of growth, terrain. Irrigation frequency is often related to irrigation scheduling, the process of determining when irrigation should occur to meet plant watering requirements and optimize water use efficiency.