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
Crop tolerance to seawater are shown in the following table: Halophytes, or salt loving plants, can be irrigated with pure seawater with the aim to grow fodder crops. A trial was made by Glenn et al. to use halophytes for feeding of sheep and it was concluded that the animals thrived well. Setting the yield of an alfalfa (lucerne) fodder crop irrigated with fresh water (2 kg/m) at 100%, the following results were obtained for the yield of halophytic crops irrigated with seawater: After selecting the most salt tolerant strains, the University of California at Davis has grown barley irrigated with pure seawater and