Morehouse, Richland, Union and West Carroll parishes were declared primary natural disaster areas.

CNN: Salt creeping up the Mississippi River

Across the country, more than 1, 000 counties in 29 states have been designated primary natural disaster counties by the Department of Agriculture (USDA).

ECONOMIST: Agriculture

"Despite BP's attempts to shift the blame to other parties, " Mike Underhill said, "by far the primary fault for this disaster belongs to BP".

BBC: BP: Gulf of Mexico oil spill 'shared responsibility'