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
Water supply and sanitation in Mali a percentage that is incredibly high at 45% in some cases. It showed that improved hygiene was twice as effective at reducing waterborne diseases than improved drinking water sources. Improved water drinking sources was not as successful due to recontamination that may occur in a household, which can happen through situations such as water handling or the way water is stored. A common issue that occurs in Mali is open defecation. Over half of the people that do not have access to safe water live in rural areas. Diseases can easily be spread when fecal matter contaminates water sources, such