Tea, silk, raw cotton, grain, the soya bean, etc., are crops in which China excels.
"The Problem of China" by Bertrand Russell
In some places I saw soya bean being grown between the rows as green manuring.
"The Foundations of Japan" by J.W. Robertson Scott
Other food crops are wheat, barley, and the soya bean, but these not numerously so.
"Up To Date Business" by Various
Metcalf & Co., Boston (soya bean meal).
"Dietetics for Nurses" by Fairfax T. Proudfit
Soya bean oil, wood oil, and fish oil present themselves as candidates for such use.
"Paint Technology and Tests" by Henry A. Gardner