date:Jan 02, 2014
y of the most intensively cropped areas of the world, including eastern Asia, Europe and the United States.
The Institute of Agriculture and Natural Resources scientists calculate that this decrease or stagnation in yield gain affects 33 percent of major rice-producing countries and 27 percent of major wheat-producing countries.
In China, for example, the increase in crop yields in wheat has remained constant, and rate of corn yield increase has decreased by 64 percent for the period 2010-2011