The C&SF established 470,000 acres (1,900 km2) for the Everglades Agricultural Area—27 percent of the Everglades before development.[87] In the late 1920s, agricultural experiments indicated that adding large amounts of manganese sulfate to Everglades muck produced profitable vegetable harvests. Adding 100 pounds (45 kg) of the compound was more cost effective than adding 1 short ton (0.91 t) of manure.[88] The primary cash crop in the EAA is sugarcane, though sod, beans, lettuce, celery, and rice are also grown. Sugarcane became more consolidated an industry than did any other crop; in 1940 the coalition of farms was renamed U.S. Sugar and this produced 86 percent of Everglades sugar.[89] During the 1930s the sugarcane farmers' coalition came under investigation for labor practices that bordered on slavery. Potential employees—primarily young black men—were lured from all over the U.S. by the promise of jobs, but they were held financially responsible for training, transportation, room and board and other costs. Quitting while debts were owed was punishable with jail time. By 1942, U.S. Sugar was indicted for peonage in federal court, though the charges were eventually dismissed on a technicality. U.S. Sugar benefited significantly from the U.S. embargo on Cuban goods beginning in the early 1960s.[90] In 1958, before the Castro regime, 47,000 acres (190 km2) of sugarcane were harvested in Florida; by the 1964–1965 season, 228,000 acres (920 km2) were harvested. From 1959 to 1962 the region went from two sugar mills to six, one of which in Belle Glade set several world records for sugar production.[91]