The amount of certified organic land in Washington rose to 64,325 acres last year, up from 46,181 acres in 2005, according to Washington State University.

The number of certified organic producers grew to 554 last year from 529 in 2005, and the amount of organic farm sales grew to $101.5 million from $77.4 million.

Researchers at Washington State University's Center for Sustaining Agriculture and Natural Resources say their numbers are on the conservative side.