The forecast of irrigation requirements in commercial olive orchards the era climate change is at forefront scientific research. Simplified models that are based on monitoring soil and plant water status, along with microclimatic variables well established. In present study, an attempt was made to correlate tree sap fluxes theoretical grass losses, as expressed by reference evapotranspiration (...

Chemical elements such as selenium, fluoride, iron, calcium and magnesium are essential to the human being, although some are toxic when absorbed in high doses. In this paper, the risks associated with insufficient and excessive intake of selenium in the diet are reviewed, focusing on drinking water. Two different approaches are used to derive recommended nutrient intakes (RNI) for adequate nut...