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
Drinking water (in decreasing order) toilets, washing machines, showers, baths, faucets, and leaks. Any public water system, which is defined as a system that serves more than 25 customers or 15 service connections, is regulated by the U.S. Environmental Protection Agency under the Safe Water Drinking Act based on minimum contaminant levels the agency sets. In some parts of the country water supplies are dangerously low due to drought and depletion of the aquifers, particularly in the West and the South East region of the U.S. The drinking water in Canada's cities is regularly tested and considered safe, but on many native