Declining sulfur levels in soil due to cleaner air

With the move from burning coal to natural gas and low-sulfur coal and an increase in the use of scrubbers, only about 25 percent as much atmospheric sulfur is available today, compared to 40 years ago. Sulfur balances in agricultural fields are now negative, with more removed each year in crop harvests and leaching than is added from fertilizers and deposition, scientists have found, suggesting that farmers may need to apply sulfur fertilizer at some point in the future, particularly on fields with less soil organic matter.