Estimation of Water Requirement and Plant Coefficient of Calendula Officinalis in Landscape

There is a strong need to develop Landscape in and around cities to prevent air pollution and create a suitable environment. This will create a new place of consumption for water. Therefore, it is necessary to estimate the evapotranspiration of urban Landscape plants to manage water use. In this study, vegetative coefficient and water requirement of Calendula officinalis plant were estimated using Wucols method and water balance method for the period of six months from 21 March 2019 to 22 September 2019 in the Botanical Garden of Campus of Agriculture and Natural Resources, University of Tehran. In this period, the average coefficient of vegetation for the whole period was 0.38 and 0.3, respectively, by the water balance method and the Wucols method. Evapotranspiration was estimated as an average of 776 mm in the water balance method and 607 mm in the Wucols method throughout the experiment. In the urban Landscape the vitality, health and decorative aspects of plants are important. By using the Wucols method to determine the water requirement, it is possible to prevent over-irrigation or under-irrigation by correctly estimating the water requirement of the plants and applying the appropriate depth of irrigation water. And provided sufficient plants growth.