In the United States as of 2014, atrazine was the second-most widely used herbicide after glyphosate,[1] with 76 million pounds (34 thousand metric tons) of it applied each year.[17][18] Atrazine continues to be one of the most widely used herbicides in Australian agriculture.[4] Its effect on corn yields has been estimated from 1% to 8%, with 3–4% being the conclusion of one economics review.[19][20] In another study looking at combined data from 236 university corn field trials from 1986 to 2005, atrazine treatments showed an average of 5.7 bushels more per acre (~400 kg per hectare) than alternative herbicide treatments.[21] Effects on sorghum yields have been estimated to be as high as 20%, owing in part to the absence of alternative weed control products that can be used on sorghum.[22]