In contrast, the average wheat yield in countries such as France is over 8 t/ha.

Even after the homesteaders bust, the center went on to develop machinery and new crops, improving the area's wheat yields.

Similarly, worldwide average wheat yields have increased from less than 1 t/ha in 1900 to more than 2.5 t/ha in 1990.

By mid-1946 Albanian peasants were cultivating more land and producing higher corn and wheat yields than ever before.

He often expressed regret that he hadn't used the chemical to increase his wheat yield.

The effort paid off by increasing his wheat yield from 12 bushels per acre to 60 bu/acre.

This led to record low wheat yields and exacerbated the problems caused by outbreak of World War I.

Here in Kansas over the last 40 years, wheat yields have doubled and corn yields have increased sixfold.

Their progress is especially important because the wheat yield is expected to be the lowest in 18 years.

American corn yields rose by 30 percent from 1995 to 2005, while wheat yields grew by only 17 percent.