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 fountain of the inland north and in the west, while "water fountain" dominated other parts of the country. The term "bubbler" is sometimes used in the Portland, Oregon, region where in the early 1900s former Wisconsin resident Simon Benson installed 20 fountains, which are now known in the Portland area as "Benson Bubblers". Currently, there are 52 of these iconic four-bowl drinking fountains still providing free-flowing water in downtown Portland. Frost-resistant drinking fountains are used outdoors in cold climates and keep the control mechanisms below the frostline resulting in a delay for when water comes out. Drinking fountain A drinking fountain,