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 in Drinking Water Act" in 2011. This amendment, effective in 2014, tightened the definition of "lead-free" plumbing fixtures and fittings. The "Drinking Water Protection Act" was enacted on August 7, 2015. It required EPA to submit to Congress a strategic plan for assessing and managing risks associated with algal toxins in drinking water provided by public water systems. EPA submitted the plan to Congress in November 2015. The "Grassroots Rural and Small Community Water Systems Assistance Act" was signed by President Barack Obama on December 11, 2015. The amendment provides technical assistance to small public water systems, to help them