In some areas the crop yield was a little as three percent.

But he said it was still too early to tell what effect that would have on his crop yield.

Sure enough, the crop yield has increased, in many cases, by four to five times.

Another held the best data he had been able to obtain on crop yields.

These variations can have a major impact on crop yield.

Much of the money will go to help farmers improve their crop yields.

Crop yields are reduced as a result of the damage they do.

A rise in crop yields would do more than end hunger.

By the mid-21st century, crop yields could increase up to 20% in east and southeast Asia.

It caused a drop of 25%-30% in crop yields compared with 1997 and 1998.