Crop rotation British Agricultural Revolution. The rotation between arable and ley is sometimes called ley farming. George Washington Carver (1860s–1943) studied crop-rotation methods in the United States, teaching southern farmers to rotate soil-depleting crops like cotton with soil-enriching crops like peanuts and peas. In the Green Revolution of the mid-20th century the traditional practice of crop rotation gave way in some parts of the world to the practice of supplementing the chemical inputs to the soil through topdressing with fertilizers, adding (for example) ammonium nitrate or urea and restoring soil pH with lime. Such practices aimed to increase yields, to prepare soil
Safe Drinking Water Act An airline with a non-complying aircraft must restrict public access to the on-board water system for a specified period. Sources of drinking water include both underground waters and surface waters. By 42 U.S.C. § 300j–13 each State is to delineate the boundaries of areas public water systems use for sources of drinking water. Within each source area the origins of regulated contaminants are to be identified in order to determine the susceptibility of the public water systems. This information can help communities understand the risks to their sources of drinking water. The SDWA includes a whistleblower protection provision. Employees in