What's left over after you harvest rice
: the stem
and the leaves
of the rice plant. On an acre
of rice, this can be as much as three tons of agricultural waste.
Most farmers around the world burn rice straw, because the ash will add nutrients back into the soil.
A recent study in India suggests that farmers could get more return from capturing the methane from burning rice straw than from burning cow dung-- and there's more straw than dung around anyway.
In California, where local air quality standards no longer permit much agricultural burning in the field, rice straw has been put to use to make:
Rice straw can also be tilled under to get the nutrients back into the soil, although not as efficiently as burning. Some California farmers have been encouraged to flood
their post-harvest fields, which helps to decompose
the rice straw as well as provide habitat
for migratory waterfowl
and the giant garter snake
in a state that has severely shrunk its natural wetlands
Sources: California Rice Commission, http://www.calrice.org;
The Hindustan Times, <www.hindustantimes.com/nonfram/240699/detOPI04.htm> (29 June 2001)
Carl G. Thelander, Editor, Life on the Edge. A Guide to California's Endangered Natural Resources: Wildlife, BioSystems Books, 1994.