Leaching model (soil) Leaching model (soil) A leaching model is a hydrological model by which the leaching with irrigation water of dissolved substances, notably salt, in the soil is described depending on the hydrological regime and the soil's properties. <br> The model may describe the process (1) in time and (2) as a function of amount of water applied. <br> Leaching is often done to "reclaim" saline soil or to "conserve" a favorable salt content of the soil of irrigated land as all irrigation water contains salts. The leaching process in a salty soil to be reclaimed is illustrated in the leaching curves
Removal of cannabis from Schedule I of the Controlled Substances Act I status. The dispute is based on differing views on both how the Act should be interpreted and what kinds of scientific evidence are most relevant to the rescheduling decision. The Act provides a process for rescheduling controlled substances by petitioning the Drug Enforcement Administration. The first petition under this process was filed in 1972 to allow cannabis to be legally prescribed by physicians. The petition was ultimately denied after 22 years of court challenges, but a synthetic pill form of cannabis's psychoactive ingredient, THC, was rescheduled in 1986 to allow prescription under schedule II. In 1999, it was again