1 bushel of soy beans = 60 lbs
1 bushel of corn = 56 lbs
1 metric ton of wheat = 37 bushels

to produce a barrel of oil from shale requires about 4.25 barrels of water,
(derived from NYT 5 Mar 74 story asserting that to produce 100,000 barrels
per year would require 20,000 acre feet per year)