Vapour-pressure deficit the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa. In ecology, it is the difference between the actual water vapour pressure and the saturation water vapour pressure at a particular temperature. Unlike relative humidity, vapour-pressure deficit has a simple nearly straight-line relationship to the rate of evapotranspiration and other measures of evaporation. To compute the VPD, we need the ambient (greenhouse) air
Water politics in the Middle East the other states through which the Nile also runs. The countries which rely upon the Tigris-Euphrates water system remain at the first stage of claiming their rights to water. However, the key player in terms of water politics in this area is Turkey, who Allan reports as having "gone a substantial way to[wards]… what it regards as its water rights by its construction programs on the Euphrates without having them recognized by downstream Syria and Iraq". This refers to the dams built by Turkey from the 1970s, partially funded by World Bank loans. The Syria-Lebanon-Palestine boundary was a product of