WORKING water.Hydroponics is a method of horticulture in which plants and crops are GROWN without soil, by using mineral nutrient solutions in an aqueous solvent.Plants grow using a process called PHOTOSYNTHESIS, in which they use sunlight and a chemical inside their leaves called chlorophyll to convert carbon dioxide and water into glucose and oxygen.The reaction is given by the following equation: 6CO2 + 6H2O → C6H12O6+ 6O2So ultimately plant requires nutrients and sunlight.The required nutrients are added to water and the plants are grown without soil. This process uses MINIMAL space, 90% less water than traditional AGRICULTURE and gives out the produce in half the time.Evapotranspiration: The term signifies total loss of water (moisture) from the soil in the form of water vapour, including that lost by evaporation from open water bodies, the surface of rocks, and also that lost by transpiration from growing plants.