> Integrated rice and duck farming is practiced in parts of Japan and China (Furuno, 2001). Weeds and insects are consumed by the ducks, manure from the ducks is returned to fertilize the rice, and humans harvest both ducks and rice at the end of the crop cycle.
https://libgen.is/book/index.php?md5=92664AF90FBD42F8E64BAB05D2341516
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